OBSERVATIONS ON A FEW LONGICORNS. 195 



united : prothorax broader than long, the posterior margin 

 convex, the lateral margins armed with eight or ten acute 

 but short spines, within the margin are two elevated lines, of 

 which the exterior is the shorter, and the space around them 

 is deeply and rugosely punctured, the disk is glabrous, with 

 a ie\Y impressed punctures about the centre. Elytra rather 

 wider than the prothorax, the margins are rather convex and 

 recurved : near each margin, and parallel with it, is a longi- 

 tudinal impression on both sides ; at each anal angle is an 

 acute, distinct, but short spine. 



Inhabits. — Brought from Velasco in Mexico. 

 Genus. Megaderus, Dejean. 



Sp. Mega, corallifer. Niger: elytra rufa, apicibus maculaque discoidali 

 nigris: pedes nigri, tibiis coccineis. (Corp. long. 1*2 unc. lat. -5 unc.) 



An injured specimen. Black: the elytra are red, the apex 

 and a large discoidal spot being black : the tihice are bright 

 red, resembling coral, the rest of the legs black. 



Inhabits. — Mexico. 



Genus. PHiEDiNUs. 



Sp. Phcsd. mcestus. Ater, nitidus : prothorax utrinque macula postica san- 

 guinea ornatus. (Corp. long. "9 unc. lat. '3 unc.) 



An injured specimen. Black, with the exception of two 

 lateral posterior red spots on the prothorax, which is thickly 

 and rugosely punctured, and has three dorsal tubercles. 



Inhabits. — Brazil. 



Genus. Rachidion, Serville. 



Sp. Rack, ohesum. Nigrum : protlioracis dorsum elytrisque, margine ex- 

 cepto, nigris ; facies tomentosa: corpus subtus nigrum, lanugine micanti 

 vestitum. (Corp. long. -85 unc. lat. -35 unc.) 



Head and antenn(e black ; face thickly tomentose : protho- 

 rax above deep red, thickly covered with confluent punctures, 

 the posterior angles deeply excavated, having an acute point 

 at each posterior angle, beneath black and clothed with a 

 shining pubescence : scutellum black, very elongate, narrow, 

 thickly punctured at the sides and longitudinally compressed 

 in the middle : elytra didl red, with all the margin, more par- 

 ticularly the humeral portion, black, regularly and deeply 

 punctured : the under side of the body is black, and nearly 

 covered with a shining but short pilosity; the legs are black. 



