and Central American Malnchiidae and Melyridae. 15 



northern or southern forms are included for comparison, 

 the names of such insects being included within square 

 brackets. 



Key to the Mexican and Central American species 

 of Collops. 



a. Elytra oblong, densely punctate; wings 

 fully developed. 

 a^. Elytra unicolorous, blue, violet, or 

 black. 

 a\ Body more robust ; legs black, femora 

 sometimes testaceous. 

 a^. Head uniformly punctate. 



a*. .Second antennal joint (^) with 

 a long appendage, 

 a'. Head black to anterior margin, 

 prothorax and femora 

 testaceous : species large 

 [cJ imknown] .... grandis, n. sp. 

 6^ Head ( cj ?) testaceous in front, 

 o', Prothorax bimaculate on 

 disc ; testaceous portion 

 of head angularly extend- 

 ing upwards; elytra blue 

 or green : species large . bipunclalus. Say. 

 6". Prothorax vittate on disc; 

 testaceous portion of head 

 truncate behind ; first 

 antermal joint (J) toothed 

 at apex externally ; elytra 

 blue : species moderate in 



size aulicus, Er. 



c*. Prothorax immaculate; 

 elytra blue : species mod- 

 erate in size. 

 a7. First antermal joint ((J) 

 broadly oblongo-sub- 

 quadrate, concave 

 above .... paradoxus, n. sp. 

 b''. First antennal joint ((J) 

 gradually widened out- 

 wards .... frontalis, Gorh. 



