Horn.] 1UU |-0 C t. o 



5. Thorax narrow, longer than wide ; elytra ornate. 



Head and thorax obviously punctate 4. elegans. 



Head and thorax quite smooth 5. perpulchra. 



Thorax short, nearly twice as wide as long ; black, subopaque. 



6. Fulleri. 



6. Body above and beneath entirely black 7. moesta. 



Thorax red. 



Head and thorax sparsely but distinctly punctate, each punc- 

 tured with a short, black, neat hair 8. Morrisoni. 



Head and thorax absolutely smooth, without hair. 



9. nemognathoides. 



C. mirabilis Horn, Trans. Am. Ent. Soc, 1870. p. 93. 



In this species the antennae are filiform, the joints closely articulated. 



The anterior tarsi of the male are simple, the last ventral segment with 

 a shallow semicircular emargination. 



Occurs in Southwestern Utah, Mojave Desert and San Diego, Cal., 

 Rock Spring and near Yuma, Ariz. 



C. histrionica, n. sp. 



Piceous black, moderately shining, head red, humeri triangularly 

 orange yellow. Antennae black, filiform, joints moderately closely artic- 

 ulated : head oval, smooth, with but few punctures ; median line deeply 

 impressed, hind angles rounded, mouth parts piceous ; thorax longer than 

 wide, much narrowed at anterior half; disk feebly convex, transversely 

 depressed in front, a feeble median impression posteriorly, surface almost 

 entirely smooth; elytra nearly twice as wide at base as the thorax, a 

 faint slender costa on each side ; surface scabrous, the humeri nearly 

 smooth ; body beneath piceous black, shining. Length .34-.o4 inch ; 

 8.5-14 mm. 



Mule.- — First three joints of the anterior tarsi thickened, gibbous on the 

 upper side, with a deep groove producing a bilobed appearance. Last 

 ventral with a small triangular notch. 



Female. — Anterior tarsi simple. Last ventral entire. 



The form of the anterior tarsi of the male is a repetition in a less 

 marked manner of that observed in Eupompha, while the form of the 

 head, especially in reference to the median groove of the front, is seen in 

 both Eupompha and Tegrodera. 



It seems probable that species will yet occur requiring the union of the 

 three genera, as all of them are characterized by the claws being 

 unequally cleft, the lower portion shorter than the upper and connate 

 with it. 



Collected near San Diego, Cal. For specimens I am indebted to the 

 kindness of Dr. C. V. Riley. 



C. viridis Horn, Trans. Am. Ent. Soc, 1883, p. 312. 



Antennae rather stoutly filiform, the joints closely articulated, 4-10 not 

 longer than wide. 



