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



21. Discodon erythroderes. 



$. Silis erythroderes, Gorh., Biol. Centr.-Am., Coleopt. iii, 



2, p. 94 [nee S. erythrodera, Fairm. 1893]. 

 $. Silis jalapana, Pic, L'Echange, xxvi, p. 6 (1910). 



Hab. Mexico, Jalapa. 



A shining, sparsely pubescent insect, with a bright red 

 head and prothorax, and black elytra, legs, and antennae. 

 The prothorax ($) is subquadrate, with the narrowly re- 

 flexed lateral margins interrupted at the middle by a broad 

 arcuate emargination (thus appearing angulate before and 

 behind the emargination) and the hind angles prominent. 

 Four specimens are contained in the " Biologia " collec- 

 tion, two of them having the head more or less infuscate 

 at the base. Silis jalapana has tlie scutellum red, a 

 character of no great importance. D. erythroderes resembles 

 Silis haematodes, Gorh., in colour; but it has a very 

 differently shaped prothorax, the latter being formed 

 somewhat as in the male of D. coarctatum. The male of 

 the present species remains to be discovered. The similarly 

 coloured Silis melanocephala, Gorh., known from a single 

 male, has a shorter prothorax, more roughly sculptured 

 elytra, etc. 



22. Discodon melanaspis, n. sp. 



Moderately elongate, shining, finely and closely cinereo-pubescent ; 

 nigro-plumbeous or black, the base of the mandibles, the sides of the 

 head in front, and the prothorax testaceous or ruf o-testaceous. Eyes 

 rather small in (^, still smaller in $. Antennae long and slender in 

 both sexes. Prothorax (^J) subquadrate, bicallose on the disc 

 posteriorly, the margins narrowly reflexed, notched and obliquely 

 plicate at the middle (appearing broadly subangularly dilated in 

 front of the excision), the hind angles obtuse ; ($) broader and more 

 transverse, the lateral margins wider, thickened throughout, feebly 

 sinuate, constricted before the sharp hind angles, and sometimes 

 feebly angulate towards the apex. Elytra parallel, long and broader 

 than the prothorax in ^, shorter in 5, finely sculptured. Inner claw 

 of anterior tarsi, and outer claw of the other tarsi, distinctly cleft 

 at tip, in (^. 



Length (excl. head) 4i-5|^, breadth 1^1| mm. ((^ $.) 



Hab. Mexico {Truqui, in Mus. Brit. : c^ $ ; Mus. Oxon. : 

 $), Chilpancingo {H. H. Smith : $). 



This is a form of D. coarctatum with the head (except at 

 the sides in front) and scutellum black, and the elytra 



