1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 87 



Process of tlie sternum of the sixth segment somewhat quadrate in 

 posterior view, narrower at base, then broader, then narrowed again 

 to a mucronate apex. The apical faces hirsute with very long hairs. 

 Posteriorly tlie process, and the sternum below it, is medianly deeply 

 canaliculate; antically the process is straight, with tine, raised lateral 

 margins. 



Sternum of the fifteenth segment Avith the i)rocess naked, broadly 

 ensiform, medianly grooved below. The process consists of an exten- 

 sion of the transverse ridge between the anterior pair of legs, and is 

 directed cephalad into a depression between the posterior legs of the 

 fourteenth segment. Between the posterior legs of the fifteenth segment 

 is also a similar depression, but smaller, althongh the sixteenth sternum 

 is in no way modified. 



Legs of males hirsute with long bristles, especially on the distal 

 joints. Tubercles confined to the ventral face and best developed on 

 the fifth joint; on the posterior legs the tubercles of the other joints 

 are small or rudimentary. Posterior legs more slender than the others, 

 but not much shorter. 



First legs of males with the sole less developed and the claw larger 

 than on the five following legs. 



Male genitalia (PI. J I, figs. 4-9). 



Color in alcohol Aarying from dirty yellowish-white (bone color) to 

 dark purplish brown. The carinie are always light, and the posterior 

 margin of the posterior subsegment usually so, also the anterior sub- 

 segments, excepting a dark median line and a line on each side along 

 the level of the carinas Posterior subsegments bordered all around 

 with a fine jnargin of distinct brown. Legs and antenn.T reddish- 

 brown, especially the distal joints. First segment usually with a 

 broad margin of light color all around. 



Length, 65 mm.; width, 13 mm. 



Ty]}e. — ISFational Miiseum collection. Four mature males. 



Localiiy. — Tana River, East Africa, between the coast and Hameye. 



One aspect of the male genitalium of this species greatly resembles 

 that of Eurydesmus laxus, Gerstacker, as figured by Karsch, and the firvSt 

 inclination was to identify it with that species in spite of consider- 

 able discrepancies in Gerstiicker's description. These are, however, 

 too grave to be reasonably ignored. Compared with most Polydes- 

 midpe, the animal would be called very robust instead of slender. 

 Gerstiicker's measurements, however, justify his statement. Neither 

 is it loosely articulated nor slightly convex. The a])ex of the ])rocess 

 of the sixth segment of the male is not a distinct knob, and the 

 shape of tlie process does not suggest a spherical triangle. The proc- 

 ess of the fifteenth segment is not on the "fourth from the last" pair 

 of legs, but the eighth from the last, though in this respect it would 

 not be surprising if a mistake has been made in the description. 



