156 GENUS MONOLEPIS. [November, 



terminal one abruptly straitened, internal peduncle with 

 the radical joint somewhat dilated on the inner edgC; 

 second joint half as large as the preceding, suboval, entire, 

 rounded at tip; anterior feet didactyle; second, third, and 

 fourth pairs simple; fifth pair much smaller and generally 

 terminated by setse; abdomen not longer than the thorax; 

 tail furnished with a single lamellae on each side. 

 Natural Character. 

 Thorax convex, equal, longitudinally oblong, gra- 

 dually a little narrowed before, so as to pass between 

 the eyes, terminating before in a short rostrum, pos- 

 terior margin of greatest breadth, emarginate over the 

 insertion of the abdomen, posterior lateral angles, with 

 an abbreviated, slightly impressed groove above, for 

 the reception of the posterior feet, sides of the body ab- 

 ruptly deflected, vertical, slightly grooved to receive the 

 feet; eyes remarkably large, rather thicker than their pe- 

 duncles which are short, inserted on each side of the an- 

 terior part of the thorax, and destitute of prominent or- 

 bits; antennce ioMX ^ placed between the eyes, external ones 

 eleven -jointed, inserted between the anterior angles of the 

 mouth and the base of the peduncles of the eyes, folded 

 upon themselves at the third joint when at rest,^r^^ and 

 second joints nearly equal, the former cylindric, the latter 

 a little dilated beneath, with a few hairs, third rounded 

 half as large as the preceding; yowr^/t and ^^A very short, 

 subequal, eighth as long as the two preceding ones con- 

 junctly, terminated by two setae which extend to the apex 

 of the antenna, terminal joint minute, tipped with a seta; 

 interior antennce thick, bifid at tip, folded and concealed on 

 each side of the rostrum, and attached to a large, round. 

 ed, conspicuous peduncle; body beneath [pectus) with an 



