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



Trichochrous. 



Trichochrous, Motschulsky, Bull. Mosc. ii, p. 393 (1859); 



Casey, Ann. N. York Acad. Sci. viii, pp. 458, 466 



(1895); Fall, Trans. Am. Ent. Soc. xxxiii, pp. 236- 



240 (1907). 

 Pristoscelis, Leconte, Class. Col. N. Am. p. 193 (1861) 



(part., nee Woll.) ; Gorham, Biol. Centr.-Am., Coleopt. 



iii, 2, pp. 123 (1882), 327 (1886). 

 Cradytes, Casey, loc. cit. pp. 458, 533. 



Casey, in his Revision of the N. -American Melyrinae, 

 restricts Pristoscelis to the Cahfornian P. grandiceps, Lee, 

 and places the other species usually referred to that genus 

 under Trichochrous, Motsch., the former having " the 

 epistoma obsolete and the frontal margin of the head 

 beaded throughout its entire width," Cradytes has already 

 been sunk by Fall as untenable. Trichochrous appears to 

 be one of the largest genera of N. -American Coleoptera, and 

 its species are said to occur in unnumbered scores in the 

 western regions of that continent; 87 are enumerated by 

 Casey, nearly 40 of which are described by him as new 

 from single examples, and various others have since been 

 added by Fall. Gorham had very httle material, even 

 when he finished his Supplement in 1886, nine only being 

 mentioned by him. This number is now raised to 29, 

 mainly from the Mexican collections made by Truqui, 

 Hoge, and H. H. Smith, one species only, and that from 

 the summit of the Volcan de Fuego, being known as yet 

 from Guatemala. Amongst the various genera made by 

 Casey at the expense of Trichochrous, one at least of which 

 was made on a secondary sexual character, Cradytes is 

 known to me from Mexico, and it is just possible that some 

 of the forms here referred to Trichochrous may prove to 

 be better placed in Sydates or Sydatopsis. The Mexican 

 species enumerated below show a complete gradation in 

 the structure of the antennae, the forms placed at the 

 head of the genus having the joints from the fifth, sixth, 

 or seventh broadly serrate and progressively widened, and 

 those placed towards the end having the intermediate 

 joints more slender and irregularly serrate (5 and 7 being 

 often wider than 6 or 8) and the last three dilated into a 

 definite club. 



