294 G. 0. SARS, 



The urosome (PI. XXI, fig. 9) is short and stout, mucli depressed, and 

 divided into 3 distinctly defined segments rapidly diminishing in size. 



The eyes are small, rounded, and located at the bases of the lateral lobes 

 of the cephalon. The ocular pigment is of a dark hue, but the visual elements 

 would seem to be less perfectly developed. 



The superior antennae (PI, XX, fig. 3, PI. XXI, fig. 2) are very slender, 

 and somewhat more elongated in the male than in the female, considerably 

 exceeding half the lengtii of the body in the former. The peduncle is densely 

 setiferous, especially in the male, and, as usual, is composed of 3 distinctly 

 defined joints, the 1st of which is much the largest, though not fully so long 

 as the other 2 combined. In both sexes this joint is armed on the lower edge 

 with 2 distant spines. The 3rd joint is scarcely more than half as long as 

 the 2nd and very narrow. The flagellum is extremely slender, filiform, equal- 

 ling in the female about the peduncle in length, in the male considerably 

 longer, and divided into about 20 short articulations. 



The inferior antenna' (PI. XX, fig. 4, PI. XXI, fig. 3) are in both sexes 

 subpediform, but much larger in the male than in the female, exceeding in 

 the former % of the length of the body. The peduncle is only composed of 

 4 joints, the first 2 being fused together. The penultimate joint is much the 

 largest, and especially in the male very much tumefied, exhibiting a some- 

 what fusiform shape. It is in both sexes produced at the end posteriorly to 

 2 strong unguiform projections, the outer of which is the larger. These pro- 

 jections are, however, much coarser and more divergent in the male than 

 in the female (comp. PI. XX, fig. 4 and PI. XXI, fig. 3). The last peduncular 

 joint, which is very movably articulated to the penultimate one, is somewhat 

 shorter than the latter and much narrower, being sublinear in form. It is, 

 like the preceding joints, provided inside with fascicles of slender bristles, 

 and has the posterior edge produced above the middle to a short and stout, 

 somewhat recurved projection, which is received between the projections of 

 the preceding joint, when the outer part of the antenna is bent in against 

 the inner. The flagellum is not fully so long as the last peduncular joint, 

 and is composed of 3 articulations, the last 2 of which, however, are very 

 small. It is densely clothed on both edges with fascicles of slender bristles. 

 At the tip it has a dense brush of very delicate bristles, between which, on 

 close examination, 2 short curved hooks are found to project, both issu- 

 ing from the extremely small terminal joint (see PI. XXI, fig. 4). 



The buccal area (see PI. XX, figs. 1 and 2) is not much protuberant, 

 and partly covered by the 1st ]»air of coxal plates. The oral parts, though 

 exactly agreeing with those in the other species of the genus, may here be 



*ll3.-MaT. ct;j. 202. 20 



