300 



of nropoda and telson nearly as in G. nohile. Length of adult female 7 mm., 

 of male 8 mm. 



Remarks. — The present species is easily recognizable by the peculiar 

 sti'ucture of the inferior antenna', which exhibit, as it were, a clieliform 

 chai-actor, on account of tlie great development of the projection issuing 

 from the penultimate joint of the peduncle, which forms a sort of thumb, 

 against which another spiniform process originating from tlie last peduncular 

 joint, admits of being impinged ; lience the specific name. 



Description. — Tlie length of fully adult ovigerous females is about 

 7 mm., that of males 8 mm., and this species is accordingly somewhat in- 

 ferior in size to the preceding one. 



The form of the body (see tigs. 1 and 5) appears on the whole some- 

 what less slender than in C. nohile, but is otherwise rather similar. 



The cephalon is about the length of tlie first 2 segments of the meso- 

 some combined, and has the frontal edge not at all produced in the middle 

 being only slightly arcuate (see fig. 2). The lateral lobes are nai-rowly 

 rounded and not very prominent. 



The coxal plates are of exactly the same shape as in the preceding 

 species, but the 1st pair (see fig. 8) have only 3 slender bristles on the tip 

 and a few small hairs on the anterior edge. 



The epimeral plates of the metasome likewise agree with those in the 

 said species. 



The urosome (fig. 14) exhibits the usual short, flattened form, and has 

 the 1st segment very distinctly defined. On the other hand is the line of 

 demarcation between the 2 other segments far less distinct, though they are 

 not perfectly fused together, as is tlie case in some otlier known species. 



The eyes are very small and rounded, with dark pigment. 



The superior antennae are (see figs. 1 and 5) comparatively shorter than 

 in the preceding species, and in the female scarcely exceed '/j of the length 

 of the body. In the male they are, as usual, somewhat more elongated, 

 though not nearly to such an extent as in the male of C nohile. They are 

 in both sexes but sparingly supplied with bristles, and have the 1st joint of 

 the peduncle about as long as the other 2 combined. In the female this joint 

 (see fig. 3) is armed below with several acute spinules, generally 7 in number, 

 whereas in the male (see fig. 6) no trace of such spinules are found. In the 

 latter the 2nd peduncular joint is considerably more elongated than in the 

 female, being more than twice as long as the 3rd. The flagellum is in both 

 sexes shorter than the peduncle, and is composed in the female of 10, in the 

 male of 1 5 articulations. 



*U3,-MaT. CTp. 208. 26 



