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



Schaeffer, Canad. Ent. 1912, p. 184; Fall, Journ. 

 N. York Ent. Soc. xx, p. 249 (Dec. 1912). 



Collops is a gonus distinguished by its lO-jointed antennae 

 in both sexes, and by the males having an enormously 

 developed peculiarly formed second antennal joint (usually 

 furnished with a long appendage) and simple 4- jointed 

 anterior tarsi. The additional material to hand from 

 Mexico, etc., enables me to give the (^ characters of nearly 

 all the species here enumerated. Horn, in 1870, described, 

 and figured, the articulated appendage (of C. validus) arising 

 from near the base of the second joint as resembhng an 

 elongated inner maxillary lobe, slender, and furnished 

 at the tip with a brush of stiff curled hairs, and stated that 

 the appendage varied in size and development according 

 to the species. He did not, however, use this essential 

 character for distinguishing the numerous N. -American 

 forms, and Gorham was equally silent on the subject 

 when deahng with the Central American Collops, both 

 authors mainly relying on colour. Another important 

 character is the presence in various species of a depressed, 

 goggle-hke, polished, subglabrous area on each side of the 

 head before the eyes, sometimes wanting or feebly indicated 

 in $. The shape of the first and third antennal joints in 

 (^, too, often affords good differential characters. The 

 antennae and anterior legs are sometimes differently 

 coloured in the two sexes, and the head in those forms in 

 which the anterior portion is more or less testaceous 

 usually have this palhd space reduced in extent or even 

 wanting in $. In certain species the prothorax is variable 

 in colour, the black markings gradually disappearing or 

 becoming greatly extended, but in others it is constantly 

 testaceous or red. The elytra, too, vary in colour, especially 

 in the northern forms, but in the material before me the 

 basal and subapical spots rarely show a tendency to unite 

 into vittae. Fall's important " Review of the North 

 American species of Collops " (loc. cit. pp. 249-274) was 

 not seen by me till after the above remarks were written. 

 We are indebted to him for the loan or gift of fifteen critical 

 species, and his determinations of C. tricolor, Say, C. i-macu- 

 lata, F., and C. histrio, Er., have been accepted. The 

 accompanying notes have been revised so as to include the 

 valuable information thus obtained. In the subjoined table, 

 and in the remarks on the various species, a few alhed 



