92 EAST AFRICAN POLYDESMOIDEA— COOK. vol. xviii. 



Last segmeut with a distinct, fine, transverse fnrrow limiting the 

 posterior caudal projection, which is short triangular, with a blunt, 

 almost truncate, above swollen, apex, and has on each side a stout, 

 wart-like knob. Both the knobs and the apex of the segment bear 

 bristles. 



Anal valves light gray, with smooth yellow margins. Preanal scale 

 transversely subhexagonal, with small median knobs between the 

 lateral wart-like prominences. 



Second leg of the female with a long styliform jjrocess directed 

 obliquely caudad and ventrad, and lying between the legs of the 

 third pair. 



Color in alcohol pale bone-yellow, with a light-brown posterior 

 margin of the dorsal portion of the segments, and with more or less 

 evidentlj^ brown posterior corners of the anterior and i>osterior cariute. 

 Antenn.v and legs light ferruginous. 



Length, 49 mm, ; width, 10.5 mm. 



Locality. — One mature female specimen and an immature male, col- 

 lected at Mombassa. 



The male specimen was 31 mm. long and 8 mm. broad, and had 19 

 segments. There was no trace of the button-like process of the coxa 

 of the second leg, which bears the genital opening, nor of thei)rocesses 

 of the pedigerous lamina^ of the sixth and fourth from the last pairs of 

 legs. In place of the not yet developed genitalia, between the coxie 

 of the legs of the seventh segment were two transversely quadrate 

 cu.shion-like prominences. 



As the mature male of this species is not known, it is not possible to 

 determine its generic affinities. The peculiar i^rocesses of the coxoe of 

 the second legs of the female indicate the probability that it constitutes 

 a generic type. 



TYCODESMUS FALCATUS (Karsch). 

 (PL III. figs. 15, 16.) 

 Eurydesmus falcatiis, Karsch, Troschel's Archiv f. ISatnrgesch., p.43, 1881. 



Segments somewhat convex, nearly smooth. 



Carinas rather broad and thick, 



Male genital appendages compressed at base, strongly curved, dis- 

 tally provided with a stout, rather long spine; beyond this produced 

 into a very long, slender, falcate structure, slightly bifid at apex. 



Color uniform pale testaceous. 



Length, about 40 mm.; width, about 8 mm. 



LocaViiij. — Seriba Ghattas. One male specimen, collected by Dr. 

 Schweinfurth, preserved in alcohol in the Berlin Museum. 



"A new species, distinct from Eurydesmus mossamhicus and oxygonns 

 in the simply curved falciform apical i)rocesses of the male genitalia." 

 (Karsch.) 



The genitalia of this species seem quite different from those of any 

 other, and the species may prove to be geuerically distinct. For the 

 present the size and habit seem to indicate affinity with Tycodesmiis. 



