502 SEREICOENIA. 



and the sides of the metasternum coarse, the others moderately fine ; prosternal process extended almost 

 in the plane of the presternum to the very acute ante-apical tooth ; intercoxal portion of the mesosternum 

 declivous, slightly tuberculate at the sides anteriorly ; posterior coxal plates acutely, triangularly dilated 

 at their inner third. 

 Length 13|-15, breadth 3|-3f millim. (<?$.) 



Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



Found in plenty in Chiriqui. The females are very similar to the males, from 

 which they differ in their much shorter antenna?. Closely allied to the Colombian 

 L. brunnipilis, Cand., but differing from that insect in the obliteration of the elytral 

 striae (the first excepted), and the less parallel elytra, as well as in coloration. Both 

 species have very elongate antenna? in the male sex. The thorax in L. brunnipilis is 

 distinctly canaliculate along the middle, at the base only in L. nigricollis, 



3. Ludius isthmicus. 



Moderately elongate, convex, rather broad, shining ; piceous or pitchy-brown, the antennae and legs brownish ; 

 somewhat thickly clothed with short, decumbent, fulvo-cinereous pubescence. Head closely, somewhat 

 coarsely punctate ; antennas not quite reaching the hind angles of the prothorax in the male, scarcely 

 shorter in the female, joints 2 and 3 short, subequal, 4-11 moderately widened and serrate, 11 appendi- 

 culate. Prothorax broader than long, gradually narrowing from a little before the base, rounded at the 

 sides in front, parallel behind, the posterior portion only of the marginal carina visible from above ; the 

 hind angles long, not divergent, sharply, obliquely carinate ; the surface closely and rather coarsely 

 punctured, the punctuation sparser on the disc, with indications of a smooth central line, obsoletely 

 canaliculate at the base. Elytra about two and three-fourths longer than the prothorax, slightly rounded 

 at the sides, narrowing from a little below the base, conjointly rounded at the apex ; closely, finely, 

 rugulosely punctate, obsoletely striate, the sutural stria well-defined. Beneath thickly, the presternum 

 sparsely and more coarsely, punctured ; prosternal process extended in the plane of the prosternum to the 

 ante-apical tooth ; intercoxal portion of the mesosternum V-shaped, gradually declivous ; posterior coxal 

 plates broadly widened inwards, arcuately dilated opposite the insertion of the femora. 



Length 15|-17|, breadth 4£-5£ millim. ( d 2 •) 



Hab. Panama, Bugaba (Champion). 



Five specimens. The sexes are scarcely separable by external characters. This insect 

 somewhat resembles L. physorlmms, and is of the shape of the female of that species ; 

 but it is much larger, the elytral punctuation is closer and finer, the stria? are almost 

 obsolete (the first excepted), the coxal plates are less dilated at their inner third, the 

 antenna? are much shorter in the male, and the prosternal process is not declivous. 



4. Ludius subsericeus. 



Ludius subsericeus, Cand. Monogr. Elat. iv. p. 309 \ 



Hab. Mexico, Cordova and Playa Vicente in Vera Cruz (Salle 1 ). 



Four specimens of this species have been examined, including the type, apparently 

 all males. L. subsericeus chiefly differs from its allies in its subopaque, densely 

 pubescent surface, densely punctured thorax, narrow shape, and pallid legs. The 

 prosternal process is horizontal. 



