62 OrperR—COLEOPTERA. Srection—PENTAMERA. 
Group C. (=Section I. Horn). Mentum with the hind margin entire. 
Species 9 (95)—CREMASTOCHEILUS PLANATUS. 
Prats XIV, Fic. 5. : 
Elongatus ater, fere opacus; capite punctato, thorace plano varioloso, latitudine paulo breviore, lateribus 
valde rotundatis, angulis anticis auriculatis; posticis productis acutis nitidis, sulco definitis; elytris thorace 
sesqui-latioribus, confertim aciculato-punctatis, dorso planis, lateribus et apice subito valde deelivibus; tarsis 
elongatis, anticis difformibus. 
Long. corp. lin. 8-9. 
Habitat; Arizona (Dr. Irwin), U.S.A., (Leconte), Texas (Schaum in Coll. Turner). 
Syn.: Cremastocheilus planatus. Leconte, New Species of North Amer. Coleopt. in Smith’s Miscell. Coll. March, 
1863, 1. p. 81. 
Cremastocheilus deplanatus. Schaum in litt. 
Cremastocheilus procerus. MS. in Coll. Royal Mus. Berlin. 
Head punctured, somewhat dilated in front, with a longitudinal carina on the clypeus, and two elevated 
ridges inside of the eyes not reaching the anterior margin. Thorax flat above, punctured, the punctures rather 
distant, with a faint longitudinal impression in front of the basis, broader behind the apex than at its basis; 
the sides rounded with a deep incision behind the anterior angles, which are prominent and subacute; the hind 
angles acute, directed backwards and a little inwards. Scutellum with some distant large punctures. Elytra 
twice the length of the thorax, very flat on the disc, elevated and almost carinated at the sides, punctured, the 
punctures large but not deep; aciculate. Under side black, shining, sparingly covered with moderate sized 
cicatricose punctures, larger on the breast than on the last segments of the abdomen, of which the three basal 
segments are longitudinally impressed in the male. 
The mentum of this very large and remarkable species is very concave, punctured, with the posterior 
margin entire, and produced into a moderately acute point (fig. 5e, seen from below; fig. 57, seen sideways). 
Fig. 5a, represents the head seen from above; fig. 54, the basal portion of the left side of the head and front 
of the prothorax; fig. 5c, one of the mandibles; fig. 5d, one of the maxille; fig. 54, one of the anterior tarsi 
in the male, which are singularly formed; the fourth and fifth joints are enlarged and much compressed, but 
the claws are scarcely larger than in the other feet. The pygidium is very closely punctured, and obtusely 
carinated. The punctures of the elytra are oval and often confluent (fig. 5%, 57), formed by a deeply sunk and 
slender line, the edges of which, on both sides, are slightly raised so as to form a sharp margin on both sides 
the impressed line, the inclosed space of the puncture being but slightly depressed. 
Species 10 (96)—CREMASTOCHEILUS DEPRESSUS. 
‘Black, feebly shining. Head sparsely punctured, with short carina at middle of clypeus, and a lateral 
carina extending from the occiput, where it is highest, to the reflexed elypeal margin; occiput with transverse 
groove. Thorax, one-fourth broader than long, broadest at anterior third; sides strongly rounded in front, 
gradually narrowed to base; anterior angles moderately prominent, limited by a slight suleus in the lateral 
margin; hind angles not prominent, limited within by a slight sulcus parallel with the margin; basal margin 
lobed at middle, dise coarsely punctured, and with a shallow median sulcus deeper and broader behind. Elytra 
flat; dise limited by slight elevation; sides slightly convergent behind; surface punctured with elongate 
shallow fovez, at the sides rounder. Terminal spiracle feebly prominent. Pygidium sparsely foveate, and 
subearinate at middle. Body beneath more shining, sparsely foveate-punctate ; sides of prothorax with distinct 
strige. Legs slender; anterior tibie slightly arcuate; teeth obtuse, nearly obsolete. 
‘Length,’ 66 inch.=17 millim. 
‘Two specimens taken by Mr. Gabb in California, probably in the southern end of Tulare Valley. Closely 
allied to Cr. planatus, which has the hind angles of the thorax prominent and smooth, and the teeth of the 
(fore) tibiz acute. The fourth anterior tarsal joint is suddenly broader than the preceding, and equals twice 
its breadth. The anterior edge of the mentum plate is thicker, and in the concavity more coarsely punctured.’ 
Syy. : Cremastocheilus depressus. Horn, Trans. Amer. Ent. Soc. Dec. 1871, p. 340. 
