288 BRITISH TYEOGLYPHID^:. 



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different form is disclosed. It is largest, and therefore 

 most easily seen, on the fourth leg of the male (PL 

 XVIII, fig. 8) ; but the other caroncles are more or less 

 of the same form. In the fourth tarsus of the male 

 the basal part, which forms three-quarters of the length, 

 is the shape of an oval vase ; narrowing toward the 

 proximal end, which is truncated, and narrowing 

 toward the distal end ; where, however, it curves out- 

 ward again ; and terminates distally in a trilobed end, 

 almost a trefoil. Transversely across this part is a fine 

 rod of clear chitin, to the distal side of which the small 

 claw is attached ; the tendon of the retractor muscle is 

 inserted on the proximal side. The caroncle is flat and 

 composed of extremely thin membrane along the sides 

 and edges ; but its median part, which contains the 

 tendon, is thicker and stiffer. The whole edge of the 

 proximal vase-like division of the caroncle is set with 

 extremely fine short hairs with intervals between them. 

 The penis and its supporting sclerites are large, 

 conspicuous, and dark in colour (PL XVIII, fig. 4; 

 PL XIX, figs. 9, 10); it lies between the cox a3 of 

 the fourth pair of legs. The anal opening has a 

 chitinous piece at its anterior, and one at its posterior 

 end, which projects beyond the end of the remainder 

 of the abdomen ; and is therefore seen from the dorsal 

 aspect as well as from the ventral. There is a short 

 sternum to which the epimera of the first pair of legs 

 are joined ; the second pair are free, and there is a 

 short epimeral piece behind the second leg. The third 

 and fourth epimera are joined, and would form some- 

 thing resembling the loop of the same parts in the 

 female were not the posterior portion broken into two 

 pieces with an interspace between ; both epimera have 

 long, deep blades on their anterior parts (PL XIX, 

 figs. 4, 7). 



Nymph. Haller remarks that the nymph resembles 

 the male more than the female. This is unusual, never- 

 theless it is correct in so far as that it is widest at the 

 shoulders, and has the projecting anal commissure ; but 



