1 895- Xo. S. SOUTH-AFRICAN ENTOMOSTRACA. ;i 



which admits of being doubled upon the adjacent, greatly tiunefied 

 portion of the antenna. Of its joints, the ist is the largest, and is armed, 

 anteriorly with an appressed spiniform projection. The succeeding joint 

 somewhat exceeds in length the outer 2 combined, and has, posteriorly, 2 

 bristles. The tumefied portion of the antenna comprises 6 joints, the 

 ist of which is the smallest, and carries, anteriorly, a strong curbed spine. 

 The penultimate joint of tliis portion has, anteriorly, a comb-like lamella, 

 and the last joint a similar lamellar projection, which, however, has the 

 edge undivided, and terminates in a sharp point. Within this tumefied part 

 of the antenna, extends a ver\- strong muscle, wliich is, apparently, com- 

 posed of 2 juxtaposed musailar bands, both being distinctly striated trans- 

 versally, and joining the base of the movable terminal part. The proximal 

 part of the antenna is. at the junction with the tumefied portion, as it 

 were, instricted: and the joints are, here, connected by ver^- oblique 

 articulations. 



The posterior antennae, oral parts, and natatory- legs, exactly agree 

 with those parts in tlie female. 



The last pair of legs Tl. 7, fig 7), on the other hand, are very dif- 

 ferent, and modified in a similar manner to that found in male Diaptorni^ 

 the legs being very unequally developed. In both legs, as in the female, 

 a biarticulate basal part, and 2 rami can be distinguished, the inner of 

 which, however, is quite rudimentary-, especially on the left leg. The 

 outer ramus in each leg is biartiailate, but in the right leg tliis ramus is 

 exceedingly large, and the basal part of the leg is, likewise, much coarser. The 

 2nd joint of the ramus is oblong oval, and somewhat inair^-ed, carrying, 

 outside, near the end, a strong spine. To the tip of the joint is connected, 

 by a very movable articulation, a long, and slender claw, terminating in 

 an acute point. In the left leg. the outer ramus is scarcely half as long 

 as in the right. Its ist joint is slightly dilated in its outer part, and 

 carries 3 spines, one of which, issuing from the outer edge, is partiailarly 

 strong. The terminal joint is verv' small, abruptly incurved, and without 

 any claw or spines. 



The testes are combined into a single, somewhat cordiform mass, 

 which is located, dorsally, \\-ithin the ist segment of the metasome. Imme- 

 diately behind this mass is traced a strongly t\visted duct, the outer part 

 of which extends assymetrically through the left side of the metasome, and 

 often contains a long bottle-shaped body, the spermatophore, to be fastened, 

 by the aid of the last pair of legs, to the genital protuberance of the 

 female. 



4* 



