426 SEERICORNIA. 



more parallel shape, the slightly shorter antennae, the less divergent hind angles of the 

 thorax, and the flatter elytra, the striae of the latter more finely punctured. The 

 elytra in the male are relatively broader than in the same sex of A. campylinus. 



14. Aptopus campylinus. (Tab. XIX. fig. 11, s .) 



Cardiophorus campylinus, Erichs. in Germar's Zeitschr. fur Ent. ii. p. 333 \ 

 Aptopus campylinus, Cand. Monogr. Elat. iii. p. 234, t. 4. figg. 5, 5 a 2 . 

 Cardiophorus decumanus, Erichs. loc. cit. p. 332 3 . 

 Cardiophorus linearis, Erichs. loc. cit. p. 332 *. 



Hob. Mexico 1-4 (coll. Janwn), Santa Clara in Chihuahua (Edge), San Andres Tuxtla 

 (SallS). 



I have seen seven examples only of this species — three ( 6 ) of a small black form 

 (two from San Andres Tuxtla and one in the Janson collection), which Candeze 

 describes under the name of campylinus ; three ( 6 ) of a much larger, brownish or 

 reddish-brown form (one from Santa Clara, from which our figure is taken, and two 

 in the Janson collection), belonging to his var. d; and one ( 2 ), black, with the elytra 

 fuscous (from the Laferte collection). It seems to be as variable as its allies. The 

 largest specimens measure 9 millim. The synonymy is given on Dr. Candeze's authority. 



TRIPLONYCHUS. 



Triplonychus, Candeze, Monogr. Elat. iii. p. 236 (1860). 



A genus containing about a dozen described species, all from Tropical South 

 America. Three are now added from Central America. In two of these, as in 

 T. cingulatus, Cand., from Venezuela, the fourth tarsal joint is sublamellate, and the 

 tarsal claws are bicuspid, the basal tooth being obsolete. Triplonychus is chiefly 

 distinguished from Horistonotus by the irregular double series of punctures on the 

 elytra, these replacing the true striae. T. trivittatus has the fourth tarsal joint dilated ; 

 it will probably have to be separated from this genus. 



Claws tricuspid ; fourth tarsal joint simple ; antennae short ; alternate elytral 



interstices sharply carinate before the apex carinatus. 



Claws bicuspid ; fourth tarsal joint sublamellate ; antennae elongate ; alternate 

 elytral interstices costate or subcostate before the apex. 



Fourth tarsal joint dilated trivittatus. 



Fourth tarsal joint narrow parvulus. 



l. Triplonychus carinatus. (Tab. XIX. fig. 7.) 



Very convex, moderately elongate, shining, finely and sparsely pubescent ; black, with a brassy lustre, the 

 elytra brown, indeterminately testaceous at the base and apex ; the antennas black, with the two basal 

 joints rufo-testaceous ; the legs testaceous, the femora in great part piceous ; beneath black, the last two 

 ventral segments testaceous at the apex. Head thickly, finely punctate, the vertex with a shallow 

 depression in the middle ; antennae slender, short, not nearly reaching the base of the prothorax. Pro- 



