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



rufo-testaceous. Eyes very large; antennae long, distinctly 

 serrate, rather slender. Protliorax strongly transverse, as wide as 

 the elytra, narrow at the base, broadly excavate and canaliculate 

 on the disc, with strongly developed, overlapping, oblique lateral 

 lobes — the anterior lobe broad, emarginate and ciliate behind, the 

 inner imbricate portion triangular, the posterior lobe truncate 

 externally. Elytra long, subparallel, finely sculptured. Inner 

 claw of anterior tarsi angularly dilated at base. 

 Length (excl. head) 5-5^, breadth 1|-1| mm. 



Hab. Guatemala, San Geronimo in Baja Vera Paz. 



Two males, included by Gorham under S. dilacerata. 

 The only other Central American species of this section 

 with greatly enlarged eyes in the male is S. festiva, from 

 Chiriqui, which has posteriorly dilated elytra, pale legs 

 and antennae, etc. The longer elytra, with pale suture, 

 and the emarginate anterior lateral lobe of the prothorax 

 and the large eyes of the male, separate S. hiauriculata 

 from 8. dilacerata, etc. 



9. Silis bilamellata, n. sp. (Plate VIII, fig. 72, prothorax, <^.) 



^. Moderately elongate, shining, finely pubescent ; nigro-piceous, 

 the anterior portion of the head, the base of the mandibles, the 

 reflexed edges of the prothorax in part, the scutellum, and the 

 sutural and outer margins of the elytra, whitish, the rest of the pro- 

 thorax rufo-testaceous (in the Pearl Island example fuscous, with 

 an oblong reddish patch on the middle of the disc), the knees tes- 

 taceous. Eyes moderately large. Antennae long, distinctly serrate. 

 Prothorax strongly transverse, not wider than the base of the 

 elytra, excavate on the disc, with two rather broad, overlapping 

 lateral lobes, the anterior lobe directed backward and rounded 

 externally, the posterior lobe directed straight outward and truncate 

 at the apex. Elytra moderately long, subparallel, finely sculptured. 



Length (excl. head) 4|— 5, breadth If mm. 



Hah. Guatemala, San Jose on the Pacific coast [type] ; 

 Panama, San Miguel in the Pearl Is. 



Two males, the one from Guatemala mentioned by 

 Gorham in his remarks on S. ludicra, the other from the 

 Pearl Is. labelled by him as Silis n. sp. near torticollis. 

 These two examples agree perfectly in the form of the 

 lateral lobes of the ,^ prothorax, but the Panama specimen 

 has less elongate elytra, the disc of the prothorax infuscate 

 on each side, and the eyes slightly smaller. S. hiauriculata, 



