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



3. Silis distorta. (Plate VIII, fig. 66, prothorax, (^.) 

 Silis distorta, Gorh., Biol. Centr.-Am., Coleopt. iii, 2, p. 95 



Hab. Guatemala, Pacific slope and vicinity of the capital. 



This species, of which a long series was obtained, may be 

 known from S. dilacerata by the larger and broader pro- 

 thorax of the male, the lateral lobes of which are broad, 

 imbricate, and directed backward; the prothorax of the 

 female, too, is less transverse than in S. dilacerata, and in 

 both sexes it is much suffused with black on the disc, the 

 space between the dark patch and the flavous outer and 

 anterior margins being partly red. The outer limb of the 

 elytra is sometimes testaceous at the base. The mandibles 

 of the female are curved. 



4. Silis torticollis. (Plate VIII, fig. 67, prothorax, (^.) 

 Silis torticollis, Gorh., Centr.-Am., Coleopt. iii, 2, p. 301 



(J. Prothorax short, as broad as, or broader than, the elytra, 

 narrow at the base, excavate down the middle, strongly trilobate 

 laterally — the anterior lobe curved backward, rounded in front, 

 and deeply excavate behind, the others oblique and contiguous (the 

 anterior one narrow, the other broad); elytra rather shining, with 

 an elongate space on the disc beyond the middle impressed with 

 irregular rows of coarse punctures, the rest of their surface very 

 finely sculptured ; inner claw of anterior tarsi angularly dilated at 

 the base. 



$. Prothorax narrower than the elytra, the margins deeply 

 excised at the middle and with a stout blunt in front of the emargina- 

 tion; elytra opaque, finely sculptured throughout; mandibles 

 bent; eyes smaller than in cJ; antennae shorter and less serrate 

 than in (^. 



Hab. Panama, near the city [c^] and San Miguel in the 

 Pearl Islands. [(^ $, types.] 



A small nigro-fuscous insect, with the anterior portion 

 of the head, the mandibles, and the prothorax wholly or 

 with the lateral portions broadly, testaceous. Six males 

 and three females seen, one pair only having the prothorax 

 immaculate. The sexual differences in the elytral sculpture 

 were not noticed by Gorham. 



