334 SERRICOKNIA. 



the basal declivity) flat. Beneath sparsely punctured ; prosternal sutures deeply excavate in front : 

 mesosternum with the sides strongly raised and obliquely declivous, separated from the metastemum by 

 a deep transverse suture ; posterior coxal plates angularly widened opposite the point of insertion of the 

 femora. 

 Length 9|-14, breadth 2|-3| millim. ( d 2 •) 



Hab. Mexico, Jalapa (Edge). 



Twelve examples, four of which are males. Closely allied to I. melas, but less 

 elongate, and with the under surface, the prothorax excepted, ferruginous. From 

 /. 7iigricornis it differs in having the hairs on the upper surface blackish (instead of 

 flavo-cinereous), the metastemum (as well as the abdomen) ferruginous, and the sides 

 of the mesosternum more raised. The abdomen is more sparsely punctured than in 

 either of these species. The specimens described appear to be perfectly mature. 



38. Ischiodontus aterrimus. 



Very elongate, ratber broad, subcuneiform, moderately convex, shining ; above and beneath deep black, the 

 hind angles of the prothorax ferruginous within ; the antennae and legs pitchy-black, the knees and the 

 upperside of the hind femora ferruginous ; the upper and under surfaces sparsely clothed with rather 

 long blackish hairs. Head thickly, somewhat coarsely punctate, longitudinally depressed in the middle 

 between the eyes and also depressed on either side in front, the frontal carina prominent, rounded ante- 

 riorly ; antennae not half the length of the body, the joints from the third moderately widened, becoming 

 narrower outwards, 3 and 4 equal. Prothorax broader than long, convex, narrowing from the base, a 

 little rounded at the sides anteriorly ; the hind angles strongly produced, divergent, carinate above ; the 

 surface finely, sparsely punctate, shallowly canaliculate behind. Elytra very elongate, narrowing from 

 the base ; very finely seriate-punctate, the punctures towards the apex and suture placed in fine almost 

 obsolete striae ; the interstices flat, sparsely, minutely punctate. Beneath thickly and somewhat coarsely 

 punctate; prosternal sutures shallowly grooved in front; mesosternum with the sides raised, sub- 

 horizontal, somewhat abruptly declivous in front ; posterior coxal plates strongly triangularly widened 

 opposite the point of insertion of the femora. 



Length 19|, breadth 4f millim. ( $ .) 



Hab. Panama, Chiriqui (Trbtsch). 



One female specimen. Larger and broader than the corresponding sex of /. melas, 

 the pubescence above and beneath, and the legs, almost black, the thorax more trans- 

 verse, the prosternal sutures obsoletely grooved in front, the sides of the mesosternum 

 less raised behind, and more abruptly declivous in front. In the obsoletely grooved 

 prosternal sutures this insect approaches the genus Crepidius, and in having the sides of 

 the mesosternum raised and subhorizontal it resembles some of the species here referred 

 to Atraetosomus, in which it would be equally well placed. The antennas are formed 

 very much as in the females of /. melas and its allies. 



39. Ischiodontus ichthydius. 



Ischiodontus ichthydius, Cand. Monogr. Elat. ii. p. 129 \ 



Hab. Mexico \ Cordova (Salle) ; Beitlsh Hondueas, Belize (Blancaneaux) ; Guate- 

 mala, Yzabal (Salle), San Juan, Panzos, and Panima in Vera Paz (Champion) ; Panama, 

 Bugaba, Volcan de Chiriqui (Champion). 



