and Central American Telephorinae. 35 



what differently shaped prothorax. The var. a approaches 

 D. cinereum, Gorh. 



19. Discodon bicallosum, n. sp. 



$. Moderately elongate, shining, finely pubescent; black, the 

 sides of the head before the eyes, a sharply defined oval spot on the 

 front, the base of the mandibles, the basal joint of the antennae 

 beneath, and the margins of the prothorax posteriorly, pale flavous. 

 Head short, the eyes small ; antennae moderately long. Prothorax 

 transversely subquadrate, bicallose on the disc, feebly sinuate at 

 the sides, the latter armed with a stout, oblique, laterally projecting, 

 dentiform callosity towards the apex, the hind angles sharply 

 rectangular. Elytra moderately long, parallel, much wider than the 

 prothorax, rugulosely sculptured and subcostidate. 



Length (excl. head) 4|, breadth 1| mm. 



Hab. Guatemala, San Geronimo in Baja Vera Paz 

 (Champion). 



One specimen, placed in the " Biologia " collection 

 under D. cinereum, a Guatemalan insect with a very 

 differently shaped prothorax in the female. D. bicallosum 

 is closely related to the Mexican D. simplex, from which 

 it may be known by the peculiarly coloured head and pro- 

 thorax, the latter with a stout, oblique, marginal callosity 

 on each side towards the apex and sharply rectangular 

 hind angles. 



20. Discodon coarctatum. 



Silis coarctata, Gorh., Biol. Centr.-Am., Coleopt. iii, 2, 



. . p. 303 (c^). 

 Silis hilara, var. ?, Gorh., loc. cit. p. 306 (part.) (specim. 

 with black legs) (?). 



Hab. Mexico, Cordova. 



Described from five males, four of which are now in the 

 British Museum. This insect has the prothorax of the male 

 shaped very much as in D. {Silis) anale, Gorh., from which 

 it differs in the rufo-testaceous head, prothorax, and 

 scutellum, the less thickened lateral prominences of the 

 prothorax, and the simple seventh dorsal segment, of the 

 male, etc. Two examples have the head infuscate at the 

 base. One of the two females placed by Gorham under 

 Silis hilara must belong here ; it is very like the same sex of 

 the nearly allied D. melanaspis, but has shorter antennae, 

 a red head, etc. The tarsi have one of their claws cleft 

 at the tip in the male. 



