167 



clothed laterally, at some distance from the hind edge, with an oblique series of 

 small spinules; last segment much shorter than the preceding one. Caudal rami 

 unusually produced, being rather longer than they are broad, and oblong quadran- 

 gular in form, apical setse comparatively short and distinctly spinulose, the outer 

 median seta with a conspicuous bulging on the outer side near the base. Anterior 

 antennae not much elongated, 8-articulate, 4th joint somewhat longer than 3rd, 

 terminal part scarcely attaining half the length of the proximal. Posterior antenna; 

 with the outer ramus rather small, middle joint exceedingly minute and without 

 any seta. Oral parts quite normal. 1st pair of legs with the outer ramus some- 

 what longer than the 1st joint of the inner and densely spinulose outside, middle 

 joint without any seta inside, last joint shorter than the middle one and carrying 

 on the tip 2 claw-like spines and 2 geniculated setse; 1st joint of inner ramus 

 twice the length of the other 2 combined, last joint somewhat longer than the 

 2nd, apical claw rather strong, nearly straight, and distinctly spinulose on one of 

 the edges. Natatory legs with the setse much reduced in number. 1st joint of 

 outer ramus in all the pairs without any seta inside, terminal joint of same ramus 

 in 2nd pair likewise without any setae on the inner edge, and in the 3rd pair 

 with only a single seta; terminal joint of inner ramus in the 2nd and 4th pairs 

 with only one seta inside. Last pair of legs with the distal joint rounded in 

 form and carrying 5 rather slender marginal setse, inner expansion of proximal 

 joint extending almost as far as the distal joint, marginal setse 5 in number. 

 Ovisacs narrow oblong and only slightly divergent. Spermatophore attached to the 

 genital segment unusually large, extending to the end of the antepenultimate 

 caudal segment. 



Male, as usual, of smaller size than female, and having the urosome di- 

 stinctly 5-articulate and somewhat thicker than in that sex. Anterior antennse highly 

 chitinised and distinctly prehensile, with the 4th joint strongly dilated. 1st pair 

 of legs with the 2nd basal joint armed inside with a very strong deflexed tenon- 

 like projection, blunted at the tip and of a very dark colour, 1st joint of inner 

 ramus considerably thicker than in female, and having inside close to the base a 

 darkly-coloured nodiform prominence. Inner ramus of 2nd pair of legs with the 

 distal joint highly chitinised and projecting at the end in a strong bayonet-shaped 

 process, on the inner side of which a more slender spiniform appendage is attached. 

 Last pair of legs much smaller than in female, distal joint rather narrow, with 

 2 of the outer setse spiniform, inner expansion of proximal joint very slight, with 

 2 unequal spines and numerous small spinules. 



Colour dark yellowish grey. 



Length of adult female 1.15 mm., of male 0.98 mm. 



