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



toothed within ; antennae ((^) not so long as the body, stout, serrate, 

 pubescent, joints 2-5 gradually increasing in length. Prothorax 

 transverse, short, nearly as wide as the elytra, rounded at the sides 

 anteriorly, conspicuously margined, and finely canaliculate down 

 the middle of the disc. Elytra not quite reaching the middle of the 

 wings, without trace of costae. Penultimate dorsal segment of 

 abdomen d^) truncate at apex, the terminal one emarginate. 

 Length 21-3 mm. ((J ?.) 



Hab. Panama, Bugaba, Tole. 



Three males and one female, the latter now wanting the 

 antennae, treated by Gorham as a form of his Malthodes 

 pallvpes. The present insect is nearly related to Malthinus 

 terminalis, Gorh., both having sharply toothed mandibles, 

 differing from that species in its much smaller size, opaque 

 surface, stouter antennae, and short, broad prothorax. 



8. Malthinus semirufus, n. sp. 



Shining, finely pubescent; head, prothorax, and scutellum rufo- 

 testaceous, the head flavous in front, the eyes, antennae (except 

 the basal joints beneath), elytra, wings, under surface in part, and 

 dorsal surface of abdomen piceous or nigro-piceous, the legs and rest 

 of under surface pale testaceous. Head extremely large, obliquely 

 narrowed behind the moderately developed prominent eyes, closely 

 punctate, somewhat tumid on the middle of the vertex ; antennae 

 slender, moderately long (outer joints broken off). Prothorax 

 broader than long, a little narrower than the elytra, constricted 

 and much narrowed anteriorly, and sinuate at the sides before the 

 base ; sparsely, finely punctate, canaliculate down the middle and 

 transversely depressed on the disc behind. Elytra long, incom- 

 pletely covering the wings, closely, coarsely striato-punctate, the 

 smoother apical patch vaguely punctulate. Tibiae straight. 



Length 5 mm. 



Hab. Mexico {Mus. Oxon.). 



One specimen, assumed to be a male. A large, exagger- 

 ated form of the Guatemalan M. cruenticeps, Gorh., with an 

 enormous head and a greatly developed prothorax, both of 

 which are rufo-testaceous in colour. 



9. Malthinus cruenticeps. 



Malthinus cruenticeps, Gorh., Biol. Centr. Am., Coleopt. 

 iii, 2, p. 104 (excl. var., p. 310). 



Hab. Guatemala, Cubilguitz in Alta Vera Paz, 1050 ft. 



