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



anterior one (as in the type) (fig. 75) ; elytra ((^) slightly shorter and 

 less broadly explanate posteriorly. 



Hob. Mexico (Mus. Brit.), Cordova, Toxpam, Teapa 



The type of this insect, a male from Irazu, has a small, 

 feebly developed prothorax, with a narrow bent anterior 

 lateral lobe, and the elytra long and somewhat broadly 

 explanate posteriorly. The Mexican examples seen (4 (^ (^ 

 and 1 9) are slightly different and may have to be separated. 

 The head (except along the anterior margin) and elytra 

 are black, the latter with the sutural and outer margins 

 white or pale testaceous, the prothorax and scutellum are 

 testaceous, and the legs, antennae, and under surface are 

 infuscate. The female has the sides of the prothorax 

 simply notched before the hind angles and convergent 

 thence to the apex. The prothorax of the male has a very 

 deep fovea in the centre of the median excavation. 



12. Silis jocosa. (Plate IX, fig. 76, prothorax, ^.) 



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



2, p. 96 (part.). 

 Silis jocosa, (jrorh., loc. cit. p. 301. 



Hab. Panama, Volcan de Chiriqui, Bugaba. 



Differs from S. albicinctain the testaceous head, antennae, 

 and legs ; the less elongate shape, with the elytra still 

 more dilated posteriorly ; the smaller eyes in the male ; 

 and the broader prothorax in both sexes, that of the male 

 being much wider than the elytra and with longer and 

 stouter overlapping lateral lobes, the anterior lobe hollowed 

 above and obliquely sagittiform and ciliate behind, leaving 

 a minute window-like opening visible between them. The 

 female has a broader head and the prothorax narrowly 

 notched at the hind angles. Of the twelve specimens seen, 

 three only are males. 



13. Silis festiva. (Plate IX, fig. 77, prothorax, cJ.) 



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



2, p. 96 (part.). 

 Silis festiva, (rorh., loc. cit. p. 301 {^ $). 

 Silis albicincta, var. testaceipes, Pic, L'Echange, xxvi, p. 6 



(1910). 



Hab. Panama, Volcan de Chiriqui. 



