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



narrowly reflexed than in D. anale; the female, however, 

 is extremely like the same sex of the last-named insect. 

 The tarsal claws of the male appear to be simple, but in 

 certain aspects one of them seems to be feebly cleft at the 

 tip. In one of the females the prothorax is distinctly 

 carinate between the dorsal callosities. D. simplex has 

 duller elytra and shorter antennae. 



18. Discodon simplex, n. sp. 



Moderately elongate, narrow, somewhat shining, finely cinereo- 

 pubescent ; nigro-piceous or black, the anterior margin of the head 

 (at the sides only in $), the bases of the palpi and mandibles, and 

 the tip of the last ventral segment in ^, testaceous. Head short, 

 the eyes small ; antennae moderately long, rather slender, sub- 

 equal in length in the two sexes, the basal joint not much thickened 

 in (^. Prothorax (^J) transverse, bicallose on the disc posteriorly, 

 gradually dilated from the apex to the deep, angular post-median 

 excision, and again dilated thence to the subrectangular hind angles, 

 the margins callose and reflexed in front of the excision (the tooth 

 thus formed truncate behind); ($) transversely subquadrate, the 

 margins sinuate, armed with an oblique dentiform callosity at about 

 the apical third, and obliquely converging thence to the apex, the 

 hind angles acute and laterally projecting. Elytra moderately 

 long, parallel, a little broader in $. Inner claw of anterior tarsi 

 angularly dilated at base and cleft at tip, and outer claw of the 

 other tarsi cleft at tip, in (J. 



Var. o. Prothorax with the sides broadly to near the apex, and 

 the anterior legs in part, rufo-testaceous. $. 



Var. p. Larger and more elongate ; the entire anterior portion 

 of the head, the palpi, the outer limb of the elytra, and the margins 

 of the abdomen, testaceous. $. 



cj. Seventh dorsal segment moderately long, simple, the eighth 

 narrow and angularly excised at the tip ; seventh ventral segment 

 broadly cleft, the lateral portions bluntly rounded at the apex. 



Length (excl. head) 3|-5|, breadth H-l| mm. {^ ?.) 



Hab. Mexico, Xucumanatlan and Amula in Guerrero, 

 6000-7000 ft. {H. H. Smith). 



Described from two males and six females, the varieties 

 being each represented by a single example ; all the forms 

 were obtained at Amula. The non-tubulate, shorter last 

 dorsal segment of the male separates the present species 

 from D. [Silis) anale, Gorh., the female, too, has a some- 



