Dec, 19 1 2.] Fall: North American Collops. 269 



Described from Sonora in northern Mexico. Occurs also in the 

 peninsula of Lower California. 

 C. crusoe Fall. Trans. Am. Ent. Soc, XXXVI, 1910, p. 140. 



Apterous, humeri narrow. Head rufous (c?) or with sides blackish (J) ; 

 prothorax rufotestaceous, immaculate, densely subrugosely punctate and dull ; 

 elytra yellow, each with an elongate basal, and a larger posterior spot bluish 

 black, the entire limb and suture yellow, punctuation dense and coarse ; legs 

 bicolored. The basal antennal joint in the (^ is evidently longer than wide and 

 somewhat excavate posteriorly. 



San Nichols Island — coast of southern California. The narrow 

 humeri, absence of wings, maculate elytra with basal spot unusually- 

 narrow and reaching neither suture nor margin are quite character- 

 istic. Our only other apterous species is cribrosiis. 

 C. pulchellus Horn. Trans. Am. Ent. Soc, 1870, p. 83. 



Bright rufous, head except the labrum and epistomal margin bluish or 

 greenish black ; elytra with basal and subapical dark blue spots, which though 

 variable in size are as a rule smaller than in the other 4-maculate species. 

 Antennae entirely pale in the (^, basal joint elongate and distinctly excavate pos- 

 teriorly ; second joint somewhat transverse with long claw-like appendage; 3-10 

 feebly serrate. In the 5 the antennae may be entirely pale, or with joints 3-10 

 more or less dusky ; second joint unusually elongate, twice as long as wide or 

 very nearly so, and fully as long as the next two. Prothorax entirely rufous, 

 usually subimpunctate and strongly shining ; elytra very densely and rather 

 coarsely punctate ; venter entirely pale ; legs pale throughout or with the tibiae 

 dusky. 



Arizona. The type from Ft. Grant; other examples from Phoenix 

 and Riverside. El Paso, Texas. 

 C. histrio Er. Entom., p. 59. 



C. argutus Fall. Occ. Pap. Cal. Acad. Sci., VIII, p. 242. 



A little larger as a rule than 4-maculatus, the elytral spots larger, usually 

 feebly bluish or greenish, sometimes narrowly confluent, and rarely involving 

 the entire surface except the middle of the suture and lateral edge. Prothorax 

 immaculate, typically closely punctulate but polished except near the side 

 margins, but varying to more coarsely and densely punctate and entirely dull. 

 Head closely punctate, elytra very densely moderately coarsely punctate. Venter 

 varying from almost black to entirely red ; legs black. Antennas black except at 

 base; basal joint in the (^ sinuate posteriorly, appendage of second joint very 

 long; second joint of 5 elongate, not much dilated. 



The type was from Eschscholtz and was probably taken at no 

 great distance from San Francisco. The species is known to me from 



