'276 DR. W. A. CUNNINGTON ON 



Kibwesi, 19/12/04. From head, mouth, and gill-bars of several 

 large specimens of Chrysichthys hrachynema. One male and one 

 female, associated with specimens of A.ruhescens. 



Rumonge, 16/2/05. From month and surface of body of lai'ge 

 Auchenoglanis occideiitaUs , var. tcmganicanus. Sixty-four males 

 and fifty-six females (some larval) associated with specimens of 

 A. incisus. 



Argulus rubescens, sp. n. (PI. XLII. figs. 15, 16 ; PI. XLY. 

 figs. 31, 32.) 



Description. — Carapace elliptical, longer than broad, with 

 moderate antero-lateral depressions. Posterior lobes broad and 

 i-ounded, covering bnses of all but fourth swimming-legs, and 

 separated by a broad sinus, more than one-fifth the length of the 

 carapace. The edge of the carapace below is armed with small 

 spines, which extend to the region of the swimming - legs. 

 Abdomen, in the male, nearly one and a half times as long as 

 broad, about two-fifths entire length of body ; posterior lobes 

 rounded and only separated by an insignificant sinus one-sixteenth 

 length of abdomen. Abdomen, in the female, slightly longer 

 than broad, about one-quarter entire length of body ; posterior 

 lobes rounded and separated by somewhat narrow sinus almost 

 one-qiiarter length of abdomen. The furcal appendages in both 

 sexes lie at the bottom of the anal sinus. Antennulesof moderate 

 size, basal segment with rounded posterior process ; second 

 segment with blunt anterior spine, posterior small spiniform 

 process, and lateral hook of medium size. Antennae with rounded 

 process on basal segment. Immediately behind the insertion of 

 the antennule is sitiaated an accessory rounded process. Eyes 

 of moderate size, a little more than one-quarter breadth of 

 carapace apart. Suckers, in the males, rather large, '1 5 of breadth 

 of carapace; in the females, of moderate size, 'IS-* 14 of breadth 

 of carapace. Maxiliipeds fairly strong and moderately armed ; 

 basal segment produced into three broad flattened processes ; 

 "area" of fair size, oval shape, and armed with small spines. 

 A pair of accessory flattened processes is situated between the 

 bases of the maxiliipeds, and a second pair, rather slighter, a 

 short distance behind them. Flagella present on the first two 

 pairs of swimming-legs. In the male, vesicula seminalis present 

 on the third leg, copulatory peg and accessory cushion on the 

 fourth. In the female, basal segment of fourth leg produced 

 postero-laterally into pointed lobe. Colovn^ (in spirit) reddish, 

 but with lighter areas anteriorly and round the eyes. Testes 

 covered above by iri-egular blotches of reddish brown. 



Dimensions as follows : — 



Adult male (largest specimen). Adult female (largest specimen). 



mm. mm. 



Total length 3-5 Total length 5-4 



Length of carapace ... 2*3 Length of carapace ... 4'1 



Breadth of carapace... 1'9 Breadth of carapace... 3*7 



