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



and D. emarginatum. D. incisum and D. ofpositifunMum 

 are also allied forms. 



6. Discodon melanopterum, n. sp. 



$. Very elongate, narrow, shining, finely pubescent ; deep black, 

 the prothorax and mandibles rufo-testaceous. Antennae slender, 

 about reaching the middle of the elytra. Prothorax narrow, 

 broader than long, bicallose on the disc, arcuate in front, narrowing 

 from about the basal third forwards, the margins reflexed and bisinu- 

 ate, the hind angles projecting laterally, the surface comparatively 

 smooth. Elytra much wider than the prothorax, very elongate, 

 parallel ; densely, rugulosely punctate and obsoletely costulate. 



Var. o. Head, prothorax, scutellum, and anterior coxae rufo- 

 testaceous. $. 



Length (excl. head) 7-8|, breadth 2^^-21 mm. (?.) 



Hab. Mexico, Omilteme [tvpes] and Chilpancingo [var.] 

 in Guerrero 4600-8000 ft. {H. H. Smith). 



Four females, the variety represented by a single example 

 from Chilpancingo. This species is closely related to 

 D. carbonarium, Gorh., from the Quiche Mountains, etc. 

 of Guatemala. The prothorax of the female of that insect 

 is similarly shaped, but more transverse, not so smooth, 

 and more or less infuscate. The variety is very like Silis 

 haematodes, Gorh. ($), from Guatemala; but it has the 

 sides of the prothorax much less sinuate. The male of the 

 present species, if correctly placed near D. carbonarium, 

 should have one of the claws of each tarsus cleft at the 

 tip. 



7. Discodon oppositipunctum. 



Discodon oppositipunctum, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, p. 87 ; Pic, Melanges exot.-entom., fasc. ii, p. 14 

 (1912). 



Discodon schneideri, Pic, Le Naturaliste, 1910, p. 48. 



Narrow, rather shining, finely pubescent ; testaceous, the antennae 

 in part or entirely, a small spot on the vertex, another on the front 

 of the prothorax, the elytra entirely, and the knees, tibiae, and tarsi, 

 fuscous or nigro-fuscous. Eyes large and prominent in ^, smaller 

 in $. Antennae long and slender. Prothorax ((J) nearly as long 

 as broad, binodose on the disc behind, deeply sinuato-emarginate 

 at the sides from about the middle to the acute, laterally prominent 

 hind angles; (?) transversely subquadrate, the margins feebly 



