1879.]

beneath coarsely punctured, abdomen less densely. Legs short, decidedly fossorial, femora short and broad, anterior tibiæ scarcely narrowed at base, near the apex feebly bidentate, middle and posterior tibiæ broad, scarcely narrower at base, compressed, outer margin unispinose near the middle. Tarsi short, compressed, gradually narrowed toward the end and scarcely Pl. iv, fig. 5. as long as half the tibiæ. Length .60-.64 inch; 15-16 mm.

This species is abundantly distinguished from all others in our fauna by the extremely short tarsi. The surface of the hind angles of the thorax is continuous with that of the disc, there being no limiting depression.

With this species must be united crassipes Westw. I have seen the type and know it to be identical with Schaumii, Prof. Westwood having mistaken the next species. for the present.

Occurs in California, especially in the south, near San Diego.

C. Westwoodi, n. sp.

Similar to Schaumii in all its characters, except in the form of the tarsi. These are at least two-thirds the length of the tibiæ, compressed, but scarcely broader at base than at tip. The joints are moreover more loosely articulated and do not appear to be retracted the one within the other as in Schaumii. The body beneath and abdomen are more densely punctured. Length .60 inch; 15 mm.

Occurs in Owen's Valley, California, where it was not rare, being found usually in or near ants' nests.

C. angularis Lec.

Black, subopaque, very sparsely pubescent above and beneath. Head densely punctured, clypeus arcuate in front, lateral angles broadly arcuate. Mentum moderately concave, the entire margin narrowly reflexed. Thorax broader than long, sides moderately arcuate, anterior angles moderately prominent, excavated and pubescent within, and limited behind by a slight transverse impression, hind angles triangular, continuous with the lateral margin, smooth above, pubescent beneath and separated from the disc by an oblique impression, disc feebly convex, coarsely and deeply punctured, median line vaguely impressed. Elytra flattened on the disc, convex at the sides, surface with oval foveæ moderately closely placed. Pygidium coarsely and deeply punctured. Body beneath as in Schaumii. Legs decidely fossorial, the tibiæ a little narrowed at base, tarsi about half the length of the tibiæ, strongly compressed, and gradually narrowed to tip. Length .56 inch; 14 mm.

This species is closely related to Schaumii, but is always smaller, and more elongate. The impression within the hind

PROC. AMER. PHILOS. SOC. XVIII. 104. 2x.

PRINTED DEC. 31, 1879.

angles gives them an aspect of being more prominent than in Schaumii. The tarsi are formed similarly to that species, but a little longer. The next species is also closely allied, but the legs lose their fossorial character and become ambulatorial.

This species is widely distributed in the Pacific region. C. pilosicollis Horn.

Closely related to angularis, but usually flatter above, and, when recently captured, with longer hairs. The head and thorax do not differ especially, except that the transverse impression behind the anterior angles is more distinct, and the median line more marked. The legs are ambulatorial, the tibiæ slender at base. The tarsi are as long, or very nearly so, as the tibiæ, slender, compressed and scarcely wider at base. Length .40-.50 inch ; 10– 13 mm.

Specimens recently captured have moderately long hair on the thorax, and the elytra have whitish spots arranged in irregular transverse strige, these characteristics are evanescent and are of no specific value. If the figure of the legs of C. armatus Walker be correct, the name should have priority over pilosicollis (see Westw. Thesaurus, pl. xiv, fig. 1). Occurs in California, Nevada and Oregon.

C. crinitus Lec.

Black, opaque, body above clothed with long, yellowish hairs, which are, however deciduous. Head densely punctured, clypeus a little wider than the head, in front feebly arcuate, sides rounded, anterior margin broadly reflexed. Mentum plate smooth, transversely oval, pointed behind, at bottom flat, margins reflexed more widely at the sides. Thorax broader than long, between the basal angles wider than at apex, sides moderately arcuate, anterior angles moderately prominent in front, within foveate and pubescent, posterior angles triangular, smooth, limited within by an oblique impression, disc of thorax flat, a vague median line, surface very coarsely punctured. Elytra flat on the disc, very vaguely bicostate, surface coarsely foveate punctate. Pygidium coarsely, sparsely punctate. Body beneath coarsely punctate, more shining. Legs ambulatorial, anterior tibiæ bidentate near the tip. middle and posterior slender at base, gradually broader to tip. Tarsi nearly as long as the tibiæ, compressed. Length .50 inch; 12.5 mm. Pl. iv, fig. 6.

I have seen but one of this species. It is closely allied to pilosicollis and Knochii, but differs from both by the clypeus being wider than the head between the eyes. It differs also from the former by the absence of transverse

impression limiting the anterior angles, and from Knochii by its much more depressed form, coarser sculpture. The hind angles are continuous with the lateral margin as in the two species cited. The hairs of the upper surface, although few, are a marked feature, but as they are probably deciduous as in pilosicollis, too much value cannot be attached to them in a specific point of view.

Occurs in California or Utah, locality doubtful.

C. Knochii Lec.

Black, feebly shining. Head moderately densely punctured, front slightly concave on each side, clypeus arcuate in front, side rounded, anterior margin reflexed. Mentum plate flat at bottom, sides and posterior margin more widely reflexed. Thorax one-half wider than long, base not wider than apex, sides broadly arcuate, anterior angles feebly prominent, not limited behind by a line, and feebly pubescent within, posterior angles triangular, smooth, distinctly limited within by an oblique impression, disc of thorax usually moderately convex, at middle vaguely canaliculate, surface with coarse but not densely placed punctures. Elytra moderately convex, disc rarely depressed, surface with oval shallow foveæ not densely placed. Pygidium sparsely punctate. Legs as in crinitus, tarsi as long as the tibiæ, slender and feebly compressed. Length, .36–.52 inch; 9–13 mm.

This species exhibits a slight range of variation in the sculpture of the upper surface, the punctures at times being coarser and more closely placed. This usually occurs in those specimens with the disc of thorax and elytra flatter, causing them to resemble the preceding species. The median line of the thorax is always more distinctly impressed. In very fresh specimens the surface is sparsely clothed with very short yellowish hair.

The three preceding species form a small group among those with entire mentum, by the legs being ambulatorial, tarsi moderately long, the hind angles continuous with the side margin of thorax, and not retracted.

To this species should be referred the crenicollis of Westwood.

Occurs from Illinois westward to Utah.

C. nitens Lec.

Castaneous, moderately shining. Head coarsely and densely punctured, vertex convex, clypeus arcuate, angles broadly rounded, margin moderately reflexed. Mentum plate smooth and flat at bottom, sides and pos

Horn.]

[Dec. 19,

terior margin widely reflexed. Thorax one-half wider than long, base not wider than apex, sides rather broadly arcuate, margin crenate, anterior angles very little more prominent than the apical margin, pubescent on the inner side, limited within and posteriorly by a deep grove, posterior angles smooth, auriculate, retracted within the line of the sides, and much depressed below the level of the disc, surface moderately convex, shining, punctures coarse, sparsely and irregularly placed, leaving large smooth spaces. Elytra slightly convex on the disc, coarsely, deeply and closely punctured. Pygidium coarsely punctured. Body beneath shining, coarsely but irregularly punctured. Legs ambulatorial, anterior tibiæ bidentate near apex, the terminal tooth moderately prolonged, middle and posterior tibiæ stout. Tarsi as long as the tibiæ, feebly compressed. Length 44 inch, 11 mm. Pl. iv, fig. 7. This species is the only one at present known in which the mentum plate is acute behind without notch, and the hind angles of the thorax retracted within the line of the sides. The middle and posterior tibiæ are thicker or less compressed than in any species of this series. It seems to be the link between the groups with the entire mentum and those with that organ notched or emarginate posteriorly, these all having the hind angles more or less retracted. Two specimens, western Kansas.

C. variolosus Kby.

Black, slightly shining. Head coarsely and densely punctured, vertex convex, clypeus arcuate, margin reflexed. Mentum plate deeply concave, shining, posterior margin acutely notched. Thorax more than half wider than long, sides moderately arcuate and gradually wider behind, very suddenly and rather deeply constricted in front of the hind angles, anterior angles smooth, tuberculiform, completely surrounded by a deep groove, hind angles smooth, somewhat triangular, projecting laterally and separated from the disc by a deep impression, disc of thorax slightly convex, coarsely and densely punctured. Elytra flattened on the disc, surface with shallow oblong fovea, somewhat confluent. Pygidium coarsely punctured. Body beneath very coarsely but rather sparsely punctate. Legs as in squamulosus. Length .36 inch; 9 mm. Pl. iv, fig. 8.

This species is abundantly distinguished from the preceding by the thoracic characters, the anterior angles being more completely surrounded by a groove than in any other species, in our fauna. In some specimens the median line of the thorax is feebly impressed.

Synonymous with this species are cicatricosus and Percheroni Westw.

Occurs in the Middle States region.

1879.]

C. squamulosus Lec.

[Horn.

Brownish or piceous, moderately shining. sparsely clothed with very short inconspicuous pubescence. Head coarsely and densely punctured, vertex convex, clypeus arcuate in front, sides broadly rounded, margin reflexed. Mentum plate deeply concave, posterior margin acutely incised. Thorax broader than long, sides rather irregular, usually diverging at apical third, then parallel at middle, in front of hind angles suddenly but not greatly narrowed, anterior angles scarcely more prominent than the margin, nodiform, smooth, limited within by a rather deep depression and posteriorly with a very faint groove, hind angles triangular, not very prominent, feebly punctate and separated from the disc by a deep oblique impression, disc of thorax slightly convex, coarsely and very regularly punctate. Elytra slightly convex, surface coarsely, deeply and rather closely punctate. Pygidium coarsely and densely punctate. Body beneath coarsely but not closely punctate. Legs ambulatorial, tibiæ stout, the anterior bidentate near the tip, the middle and posterior with a slight oblique ridge at middle. Tarsi as long as the tibiæ, rather slender and feebly compressed. Length .36-.40 inch; 9-10 mm.

The notch in the margin of the mentum plate varies in extent, sometimes being very slight, but usually extending through the reflexed edge.

With this species must be united junior Westw.

Occurs in Georgia and Florida.

C. canaliculatus Kby.

Black, feebly shining. Head densely punctured, front convex, clypeus arcuate in front, lateral angles broadly rounded, margin reflexed. Mentum plate deeply concave, side and posterior margin very widely reflexed, deeply emarginate posteriorly. Thorax one-third wider than long, sides moderately arcuate and slightly coarctate in front of the hind angles, anterior angles obtuse, feebly prominent, limited within by a deep fovea, surface continuous with the disc and punctured, hind angles triangular, punctured, tip slightly turned outward, limited by a moderately deep groove, but not depressed below the surface of the disc, disc slightly convex, coarsely and densely punctured. Elytra flattened on the disc, vaguely grooved, and with shallow foveæ moderately densely placed. Pygidium coarsely and densely punctured. Body beneath densely and coarsely punctured, abdomen less densely. Legs as in nitens. Length .50 inch ; 12.5 mm.

This species is known from castanea by the hind angles being much less retracted and not depressed below the disc, as well as by the form of the anterior angles.

Occurs in Canada, Georgia and Illinois.

C. retractus Lec.

Resembles very closely the preceding species in form and sculpture, and