DODECACTENUS. 447 



and closely punctured in the male, subtruncate and sparsely punctured in the female. 

 The frontal carina is slightly deflexed in the middle and feebly rounded. The 

 pubescence is coarse, whitish, cinereous, or fulvo-cinereous in colour, and on the 

 elytra seriately arranged. The under surface, the prosternum included, is very sparsely, 

 finely punctate. The basal sulci of the thorax are short and deep. The elytra are 

 narrowed from the base in the male, subparallel to the middle in the female ; the 

 punctures are very fine and scattered, irregularly arranged, except along the fine 

 sutural stria. 



2. Dodecactenus guatemalensis. (Tab. XX. fig. 2, e .) 



S . Very elongate, flattened above, shining, black, very sparsely clothed with rather coarse, decumbent, long, 

 cinereous hairs, these forming a definite line along either side of the suture of the elytra ; the antennae 

 and legs piceous or pitchy-brown, cinereo-pubescent, the antennae also ciliate along their inner edge. 

 Head sparsely, coarsely punctate, declivous in front, the carina extending obliquely downwards so as to 

 form a triangular frontal plate ; antennae nearly two-fifths the length of the body, the third joint a little 

 longer than the second, the two together scarcely so long as the fourth. Prothorax flattened behind, as 

 long as broad, conical, rapidly narrowing from the base forwards, deeply canaliculate before the base ; the 

 hind angles long, divergent, incurved at the tip, bicarinate, the inner carina the longest ; the basal sulci 

 broad and deep, rather long, and limited outwards by a distinct longitudinal plica ; the surface with 

 widely scattered rather fine punctures, these becoming coarser and more crowded towards the apex, a 

 broad space down the middle from a little before the apex to the base impunctate. Elytra more than 

 three times the length of the prothorax, narrowing from the base, flattened on the disc ; seriate-punctate, 

 the striae obliterated, except at the base, where they are deeply impressed, and along the suture, the 

 pimctures widely separated, coarse at the sides, becoming much finer towards the suture and apex ; the 

 interstices flat, each with a single very irregular row of minute punctures. Beneath rather sparsely 

 punctate, the prosternum very coarsely and closely punctured at the sides, smooth along the middle ; 

 the fifth ventral segment closely and coarsely punctured towards the apex, and longitudinally swollen 

 in the middle behind. 



2 ■ Antennae not extending beyond the hind angles of the prothorax. Prothorax somewhat rounded at the 

 sides, less flattened on the disc behind, with the deep median groove extending more forwards. Elvtra 

 subparallel to the middle. Fifth ventral segment more sparsely pnnctate towards the apex. 

 Length 15-16, breadth 4-4| millim. 



Hah. Guatemala [Salle), Purula and Cohan in Vera Paz [Champion), between Tactic 

 and La Tinta in Vera Paz (Conradt). 



Males of this insect were found in plenty at Purula. Of the females, single specimens 

 only have been received from Coban and Tactic, and there is a third in the Salle 

 collection. The sexes are very dissimilar. The present species differs in many respects 

 from D. staudingeri, more especially in the subtriangular frontal plate, the short third 

 joint of the antenna?, the sparser pubescence, the longer and broader basal sulci of the 

 thorax, the hind angles of which are bicarinate and the disc deeply canaliculate behind, 

 the less sparsely punctured under surface, the coarsely and closely punctured sides of 

 the prosternum, &c. 



