46 Mr. H. W. Bates on the Longicorn Coleoptera 



face densely clothed with short, erect, black bristles, some of 

 which arise from a little tuft of shorter bristles; moderately 

 punctured ; centro-basal tubercles surmounted each by a rather 

 long pencil of hairs : the colour is blackish brown, with a few 

 tawny specks; behind the middle is a short transverse ash- 

 coloured line crossing the suture (in some examples almost 

 obliterated), and close to the apex on each side is a triangular 

 velvety-black spot, notched on its inner side and margined with 

 ashy, the sutural space between the spots being sometimes 

 wholly ash-coloured. Body beneath and legs tawny ashy, 

 sprinkled with black ; middle of abdomen black, with edges of 

 segments tawny. The legs are stout; the thighs clavate, the 

 basal joint of the tarsi fully equal in length to the two following 

 taken together. 



cJ The apical ventral segment in the male is semicircularly 

 notched, the dorsal segment briefly and obtusely notched. 



$ The apical dorsal segment in the female is much elongated, 

 lanceolate and acute, but not keeled above ; the ventral segment 

 semitubular and truncated at the tip. 



Ega and S. Paulo, Upper Amazons, on dead branches in the 

 forest, I have a specimen also from the interior of French 

 Guiana, collected by M. Bar. 



Genus Atrypanius, nov. gen. 



Body oblong-oval or elliptical, convex. Head with the front 

 elongated; eyes oblong. Antennae not much longer than the 

 body, and nearly naked. Thorax as in Trypanidius — namely, 

 slightly uneven on the surface, widening from the front to the 

 tips of the lateral spines — which are short, conical, and acute, 

 not curved posteriorly, and placed not much after the middle of 

 the thorax. Elytra with centro-basal ridges not conspicuous ; 

 obtuse at the tip, naked. Feet very stout ; thighs strongly 

 clavate; basal joint of the tarsi short, scarcely longer than the 

 second. Mesosternum simple. Dorsal and ventral plates of the 

 apical abdominal segment obtuse in the male : ovipositor in the 

 female very short, scarcely apparent beyond the tips of the 

 elytra, the dorsal plate broadly rounded at the tip, the ventral 

 truncated. 



The present genus is founded on Lamia conspersa of Germar, 

 a species which differs from all the allied genera, except Trypa- 

 nidius, in the shortness of the basal joint of the tarsi. The ob- 

 tuseness of the apical abdominal segment in both sexes, the 

 shortness of the ovipositor in the female, and the elongation of 

 the eyes and forehead, also distinguish it from most of the groups 

 to which it is in other respects most nearly related. It differs 

 from Trypanidius (besides the elongation of the eyes) in the 



