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



internal sac disclosing a stout hook on each side and a pair of long, 

 slender, strongly curved hooks in the middle. (Fig. 36.) 



Hab. Mexico {Mus. Brit., Truqui), Orizaba, Jalapa, 

 Vera Cruz, Frontera, Teapa ; Guatemala, Capetillo [type], 

 Guatemala City, San Geronimo. 



Var. ? Anterior lateral lobe of the prothorax of (^ extending 

 further backward, sinuate externally, and drawn out at the apex 

 into a blunt tooth, the posterior lobe broader, apparently arising 

 from nearer the base, cleft at the tip. 



Hab. Mexico, Cuernavaca. 



Var. ? Anterior lateral lobe of the prothorax of (^ curved back- 

 ward, its posterior margin oblique, the posterior lobe cleft as in 

 typical S. dilacerata ; prothorax of $ simply emarginate on each 

 side before the hind angles. 



Hab. Panama, Volcan de Chiriqui. 



Various species were included under S. dilacerata by 

 Gorham, including one from San Geronimo with a pale 

 elytral suture and very large eyes in the male, S. biauri- 

 culata. The type {(^) figured by him was from Capetillo. 

 The specimens from Chontales, Chiacam, Purula, etc., have 

 an erect spine on the posterior lobe of the prothorax of the 

 male, and conspicuous whitish lateral margins to the elytra : 

 they are here separated under the name acantholobus. 

 The Juquila insect, again, S. trilobata, has the lateral 

 armature of the (^ prothorax differently formed. The 

 varieties of S. dilacerata from Cuernavaca and Chiriqui, 

 the former represented by a single male, and the latter (not 

 mentioned by Gorham) by two males and one female, may 

 have to be separated when more material is obtained. 

 The black median vitta of the prothorax is often obsolete 

 in both S. dilacerata and S. acantholobus. The outer limb 

 of the elytra is usually pale testaceous in the present species. 

 In one female of the latter the prothoracic depression is 

 wanting. 



7. Silis acantholobus, n. sp. (Plate VIII, fig. 70, 

 prothorax, (^.) 



Silis dilacerata, var., Gorh., Biol. Centr.-Am., Coleopt. iii, 

 2, p. 96. 



Moderatelj' elongate, shining, finely pubescent; nigro-piceous or 

 black, the anterior margin of the head, the base of the mandibles, 



