380 SEREICOENIA. 



slightly longer than 4. Prothorax longer than broad, convex, subparallel, the sides a little rounded and 

 converging in front ; the hind angles acute, feebly bicarinate, not divergent ; the surface rather sparsely, 

 finely punctate, with the interspaces smooth and shining, canaliculate behind. Elytra moderately 

 elongate, of the same width as the prothorax, subparallel to about the middle and narrowing thence to 

 the apex, the apices conjointly rounded ; finely and shallowly punctate-striate, the interstices flat, roughly 

 punctured, and subgranulate. Beneath thickly punctured, the prosternum and propleuree sparsely punc- 

 tate ; posterior coxal plates very broadly and angularly widened opposite the point of insertion of the 

 femora. 

 Length 6|-7|, breadth lf-l| millim. ( $ .) 



Hab. Mexico, Jalapa (Hbge). 



Two specimens, both females. Closely allied to the North-American M. rufilabris 

 (Germ.), but with relatively longer elytra, which are not marked with yellow at the 

 base. The general shape is more elongate. The thorax is broadly flavo-testaceous at 

 the base ; the outer carina is so faint as to be scarcely distinguishable. The insect is 

 unknown to Dr. Candeze. 



6. Megapenthes bicarinatus. 



Moderately elongate, feebly convex, rather dull, pubescent ; ferruginous, the head infuscate in the middle 

 behind, the prothorax with the disc in great part infuscate and the base and hind angles broadly testa- 

 ceous, the elytra testaceous, with the base on either side of the scutellum more dilute in colour, the legs 

 and antenna? testaceous. Head convex, closely punctured ; antennae ( $ ) short, reaching slightly beyond 

 the hind angles of the prothorax, slender, joint 3 a little longer than 2, the two together scarcely longer 

 than 4, Prothorax rather longer than broad, very gradually narrowing from the base forwards, the sides 

 rounded in front ; the hind angles acute and slightly divergent, finely bicarinate : the surface closely 

 and rather coarsely punctured, with the narrow interspaces dull. Elytra moderately long, narrowing 

 almost from the base, rounded at the apex ; punctate-striate, the interstices flat and somewhat roughly 

 punctured, subgranulate towards the base. Beneath thickly punctured; posterior coxal plates broadly 

 and angularly widened opposite the point of insertion of the femora. 



Length 7|, breadth 2 millim. ( $ .) 



Hab. Guatemala, Mirandilla (Chamjnon). 



One female example. Larger and broader than the corresponding sex of M. sobrinus, 

 the thorax more parallel behind and with the hind angles distinctly bicarinate. This 

 insect closely resembles an Agriotes, but the head and coxal plates are formed as in 

 Megapenthes. 



7. Megapenthes mexicanus. 



Moderately elongate, feebly convex, shining, pubescent ; ferruginous or reddish-brown, the prothorax with 

 the base broadly, the apical margin, and sometimes a median line testaceous or ferrugineo-testaceous, 

 the antennae ferruginous, the legs testaceous. Head moderately convex, thickly punctured ; antennae ( $ ) 

 short, scarcely extending beyond the hind angles of the prothorax, joint 3 a little longer than 2, the two 

 together about as long as 4. Prothorax rather longer than broad, gradually narrowing from the base 

 forwards, the sides rounded in front ; the hind angles acute and slightly divergent, finely bicarinate ; the 

 surface thickly punctured, with the interspaces smooth and shining. Elytra moderately long, narrowing 

 from about the middle, rounded at the apex ; punctate-striate, the interstices feebly convex and somewhat 

 roughly punctured, subgranulate towards the base. Beneath thickly punctured ; posterior coxal plates 

 broadly and angularly widened opposite the point of insertion of the femora. 



Length 6|-7^, breadth lg millim. ( $ 4 ) 



