330 SEEEICOENIA. 



clothed with loDg yellowish-cinereous hairs. Head somewhat convex, flattened in front, closely, rather 

 coarsely punctate, the frontal carina prominent, rounded anteriorly ; antennae extending to the middle of 

 the elytra, the joints from the third moderately widened, becoming narrower outwards, 3 as wide as, but 

 slightly shorter than, 4. Prothorax broader than long, rather convex, narrowing from the base ; the 

 hind angles strongly produced, divergent, finely carinate above ; the surface sparsely, rather coarsely 

 punctate, canaliculate behind. Elytra moderately elongate, subparallel to the middle, and narrowing 

 thence to the apex ; somewhat coarsely punctate-striate, the striae shallow ; the interstices almost flat, 

 thickly punctured. Beneath thickly punctured ; prosternal sutures deeply excavate in front ; mesosternum 

 declivous ; posterior coxal plates angularly widened opposite the point of insertion of the femora. 

 Length 8-9, breadth 2-2\ millim. ( tf .) 



Hab. Mexico, Jtiquila in Oaxaca {Salle). 



Two male examples. Allied to I. denticornis, but more parallel, the head more 

 densely and more coarsely punctured, the antennae very differently formed in the male, 

 the prosternal sutures deeply grooved, &c. 



31. Ischiodontus aeneipennis. 



Moderately elongate, convex, shining ; the head ferruginous, or piceous with the front obscure ferruginous, the 

 antennas black, with the basal joint ferruginous, the prothorax, the elytral epipleurae, and the under 

 surface rufo-testaceous, the scutellum ferruginous, the elytra blackish- or greenish-aeneous, with the suture 

 obscure ferruginous, the legs testaceous, the apex of the tibiae infuscate in one specimen ; above and 

 beneath somewhat thickly clothed with long yellowish-cinereous hairs. Head densely, rather finely 

 punctate, flattened in front in both sexes, the frontal carina prominent, slightly truncate anteriorly ; 

 antenna? — ( d 1 ) extending nearly to the middle of the elytra, with the joints -from the third elongate and 

 moderately widened, becoming narrower outwards, 3 and 4 equal — ( $ ) very short, only about one-third 

 the length of the body, joints 4-10 not much longer than broad. Prothorax moderately convex in the 

 male, very convex in the female, transverse, narrowing from the base in the male, the sides subparallel 

 behind and rounded anteriorly in the female ; the hind angles moderately produced, carinate above ; the 

 surface closely, moderately finely punctate, with a narrow space down the middle impunctate, obsoletely 

 canaliculate behind. Elytra moderately long, subparallel to the middle, and narrowing thence to the 

 apex; rather coarsely punctate-striate, the interstices feebly convex and thickly punctured. Peneath 

 thickly punctured ; prosternal sutures deeply excavate in front ; mesosternum declivous ; posterior coxal 

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



Length 7|-8|, breadth 2-2| millim. (<??.) 



Hab. Mexico, Chilpancingo in Guerrero (H. II. Smith). 



One pair. The female differs considerably from the male, but I have no doubt that 

 it belongs to the same species; it has the head piceous, the elytra more brightly 

 coloured, the thorax very convex, and the antennae very short — much shorter than in 

 the females of all the allied forms. Allied to /. prasinovterus, but more convex, the 

 thorax closely punctured, the elytra more obscurely coloured and more coarsely 

 punctate-striate, the head not excavate in front in the male. From /. denticornis it 

 may be known by the differently formed antennae in both sexes. 



32. Ischiodontus marginatum. (Tab XIV. figg. 18, 6; 18 a, antenna.) 



Elongate, subcuneiform, moderately convex, shining ; the head black, the prothorax, scutellum, elytra, and 

 under surface ferruginous or pitchy-red, the elytra with the sides from the base to the apex (except at the 

 middle in one specimen) rather broadly infuscate, the dark portions with a translucent metallic green or 



