370 Di'- F- Meiiiert on the Campodese, 



placed under the suture in tlie middle, and bifurcates near the 

 centre of the head, the two branches approaching the lateral 

 margin of the head. 



The three thorax-rings are well separated by double folds ; 

 and as some of these are chitinized both on the dorsal and the 

 ventral surface, we observe in the prothorax a prjesternum and 

 poststernum, in the mesothorax a prsetergum as well as prsester- 

 num and poststernum, and in the metathorax both praeterguni 

 and prsesternum. 



The legs are slender, with small conical coxfe ; they are rather 

 abundantly furnished with stiff hairs, particularly the feet, which 

 articulate with the tibi?e by means of regular condyles, and 

 which in length stand between the femora and the tibiae. The 

 claws are large, foliaceous, but of vmcqual length. The em- 

 podium is well developed and supported by a thin curved chi- 

 tinous piece; between the claws there is a small cultelliform 

 onychium, which might be described as a third claw, if such a 

 thing was at all possible or reconcileable with the symmetry of 

 the insect body*. The proportionate lengths of the two claws 

 and the onychium are as 3 to 2 to 1, or, more correctly, as 

 15 to 10 to 4. 



The moveable appendages on the underside of the first seven 

 abdominal rings are in this genus (or, at any rate, in the only 

 species as yet discovered) reduced to very short conical bristles, 

 each bearing a fine hair on its side, and articulated with the 

 ventral shield near its posterior corners. The first of these 

 rings, the segmentum mediale, is, besides, distinguished by a 

 small protruding wart, with five or six rows of impressed points 

 bearing setse peeping out from behind the middle of the poste- 

 rior margin of its ventral shield ; on each side of this wart there 

 is a smaller flat protuberance furnished with rather longer bristles. 

 The ventral and dorsal shields of all these seven rings cover 

 almost the whole of their upper and under surface, whilst the 

 sides only in part are covered by small pleural plates. 



The tln-ee following rings are more closely united and more 

 completely chitinized than any other part of the animal; but 

 they are without the appendages described in the preceding 

 rings. 



The sexual orifice rests on the posterior margin of the ventral 

 shield of the eighth ring, and the deeply bifid vagina of the 

 female can be protruded from behind the latter. The next ring 

 (ninth) is very short, and its ventral shield is divided into two 

 perfectly separate triangular plates. The last ring is longer and 



* Nor have the very young larvae of Melo'e been correctly described 

 as possessing three claws (whence the name Triungulinus) ; the}* have in 

 reality but one deeply trifid claw. 



