1873.] lUJ [Horn. 



C. puberula, Lcc. New Species, p. 162. 



Black, very feebly shining, surface moderately clothed with short erect 

 cinereous pubescence. Head coarsely punctured. Thorax as long as 

 wide, sides anteriorly arcuate, behind nearly parallel, base feebly emar- 

 ginate at middle, disc moderately convex, coarsely punctured. Elytra 

 slightly broader behind, surface coarsely scabrous. Body beneath black, 

 more shining than above. Legs, especially the tibiae cinereo-pubescent. 

 Length .50 inch ; 13 mm. 



ILrfe. Unknown. 



Female. Antennae gradually thicker to tip. Fifth ventral truncate, 

 sixth scarcely prominent, broadly oval at tip. 



Inner spur of hind tibiae slender, acute, outer cylindrical compressed, 

 obliquely truncate at tip. 



One female from Arizona readily known by the above characters from 

 any species in our fauna in either group. 



C. biguttata, Lee. Proc. Acad. 1853, p. 332. 



Body sparsely clothed with yellowish pubescence. Head black, shin- 

 ing, sparsely punctured. Thorax sub-quadrate, anterior angles broadly 

 rounded, disc moderately convex, smooth, scarcely punctate ; color pale 

 yellow with four black spots in transverse arcuate line, the middle two 

 larger, oval, the outer minute. Elytra parallel, scabro-punctate, color 

 pale yellow with one oval spot on each at apical three-fourths. Body 

 beneath black, moderately shining, abdomen at tip yellow. Femora yel- 

 low, tips piceous, tibiae and tani piceous, the former pubescent. Length 

 .30-.60 inch ; 7.5-15 mm. 



Male. Antenna; with joints 4-5-6 stouter. Fifth abdominal segment 

 broadly emarginate, sixth very deeply and narrowly emarginate, lateral 

 processes acute and prominent. Last dorsal segment truncate. 



Female. Antennae very feebly dilated at tip. Fifth segment truncate, 

 sixth broadly oval and very feebly emarginate at tip. 



Spurs of hind tibiae as in the preceding species. 



From the form above described this species varies to one totally yellow 

 above and beneath, on which only faint traces of the elytral spot and the 

 two middle thoracic spots may be seen. In those specimens in which the 

 head is black, the legs are more or less black, when the head is yellow the 

 knees only are black. 



This species occurs abundantly in Arizona and New Mexico. 



Group II. 



In this group the antenna? scarcely differ in the sexes, being at most 

 merely stouter in the male. The larger species have the antenna} monili- 

 form as in the preceding group, while the smaller forms have the antennae 

 slender and the joints of greater length but always cylindrical. In these 

 latter the antennae frequently equal or sUghtly exceed in length half the 

 entire length of the insect. The species may be divided in the following- 

 manner. 



