NORTH AMERICAN COLEOPTERA. 129 



stiiiiini;, very sparsely pubescent; luet-epistenia densely granulate punctate. 

 Ahdotneii sparsely punctate, transversely wrinkled at the sides. Length .27 — 

 .44 inch.; 7 — 11 mm. 



Male. — Last ventral segment broadly, but not deeply emargiuate, a depression 

 or fovea at middle of eraargination. 



i^em«?e. —Last ventral truncate. 



Very little variation has been observed, and consists in the varying 

 degree of coarseness of the punctuation and the greater or less de- 

 velopment of the elytral costse. 



Occurs in Kansas, Utah, Nevada, Oregon, Washington and Idaho. 



CKKOTOMA Chev. 



Head free, the muzzle somewhat prolonged. Antennae slender, 

 first joint rather long, second short, third nearly as long as the first, 

 fourth shorter, joints 5-11 nearly equal; maxillary palpi rather 

 stout, the last joint elongate-conical, shorter than the preceding ; 

 anterior coxse contiguous, their cavities closed behind; epipleurae 

 moderately wide, extending three-fourths to apex; tibiae slender, 

 each provided with a terminal spur ; first joint of hind tarsus as 

 long as the following joints together; claws broadly appendiculate 

 at base. 



One species occurs in our fauna: 



C. trif'ureata Forst., Nov. Spec. Ins. 1771, p. 29; camineq Fab., Syst. El. i, 

 p. 459; Oliv., Ent. vi, p. 656, pi. v, fig. 73; Lee, Froc. Acad. 1865, p. 205; var. 

 furcata Oliv., loc. cic. 643, pi. iii, fig. 50.— Oval, narrower in front, modeiately 

 convex, body beneath and head black, above yellow. Elytra with black, forming 

 a narrow basal band extending in a triangle about the scutellum and prolonged 

 along the sides nearly to apex, sometimes broken, three black spots on each side 

 of and close to the suture, the posterior smaller. Antennae pale, darker exter- 

 nally. Head black, clypeus very coarsely punctured. Thorax nearly twice as 

 wide as long, slightly narrowed in front, sides feebly arcuate, margin broader 

 posteriorly, disc moderately convex, finely alutaceous, very obsoletely, finely 

 and sparsely punctate: scutellum black. Elytra irregularly subseriately punc- 

 tate, the punctures not large nor closely placed. Body beneath black, meso- and 

 metapleurse punctate ; abdomen nearly smooth. Legs yellowish testaceous, the 

 front and middle tibise. in part, the posterior tibiae entirely black, the fenioia of 

 the latter black at apex. Length .14 — .20 inch. ; 3.5 — 5 mm. 



In the male the antennjie do not diflfer notably from the female, 

 although they are shorter and stouter. The entire front of the male 

 is yellow, only the portion behind the eyes is piceous ; the last ven- 

 tral segment is truncate. 



In the female the last ventral is oval and granulately punctate. 



The usual coloration of the elytra consists of a triangular scutellar 

 spot, which often sends a narrow stripe along the base to the humeri. 



TKANS. AM. ENT. SOC. XX. (17) • JUNE. 1893. 



