32 Mr. G. C. Champion's Revision of the Mexican 



shining, sparsely, minutely punctate. Elytra densely, rather 

 coarsely punctate. 



Length 6-6i, breadth 2|-3 mm. ((^ ?.) 



Hob. Mexico, Amula, Omilteme, Xucumanatlan, and 

 Chilpancingo, all in Guerrero {H. H. Smith). 



Eighteen examples, including eight males. This is a 

 large form of the variable C. quadrimaculatus (which occurs 

 in the same localities in Guerrero), differing constantly in 

 the shape of the second antennal joint of the male, the 

 basal joint, too, in this sex is relatively more elongate and 

 less dilated. The females are only separable from those of 

 similarly-coloured C. quadrimaculatus by their larger size 

 and broader head. 



17. Collops quadrimaculatus. (Plate II, fig. 4, basal 

 joints of (^-antenna.) 



Malachius quadrimaculatus, Fabr., Ent. Syst., Suppl., 



p. 70. 

 Collops quadrimaculatus, Er., Entomographien, p. 58 



(exclud. synon.); Lee, Proc. Acad. Phil, vi, p. 164; 



Horn, Trans. Am. Ent. Soc. iii, pp. 80, 82; Gorh., 



Biol. Centr.-Am., Coleopt., iii, 2, p. 315; Fall, Journ. 



N. York Ent. Soc. xx, pp. 255, 272. 



(^. Antennae with joint 1 much widened outwards, convex 

 externally ; 2 longer than broad, with a stout, oblique, long, denti- 

 form prominence arising from the base externally, the cavity at 

 the apex large and open, the appendage slender, received in repose 

 beneath the reflexed inner margin of the joint, and not more than 

 half its length. 



Hab. United States; Mexico, southward to Guerrero 

 and Oaxaca. 



Fall appears to have seen very few examples of C. 

 quadrimaculatus. The common Mexican insect here identi- 

 fied under that name agrees, however, with a male com- 

 municated by him. The specimens before me, from 

 Indiana, Virginia and Texas (including four males), 

 Mexico and Guatemala, have, as he describes, the second 

 antennal joint of the male longer than broad, and the 

 first joint much widened outwards. These examples have 

 the head wholly violaceous or blackish, the legs black, and 

 the second joint of the male-antenna pecuUarly formed and 

 with the appendage rudimentary. The elytral spots vary 

 in size, the anterior one usually extending to the suture 



