84 I'HOK. A. 1). IMMS UX , 



that collection are quoted in each case. Wherever material has 

 allowed, a sei'ies of co-types has also been deposited in the 

 Natural History ]:>epartinent of the British Museum, South 

 Kensington. Such species are indicated thus*. 



II. DlOSClUrTTOK OF THE SVKnKS. 



Sul)-order AllTllTlOPLEON A Hiiin. 

 Y:\m. Po I) V It I I) .K Lbk. 



Sul)-f:im. 11 vr(>(!ASTlM:i!IX.K HlilMl. 



Clonus XknyLiLA Tullb. 



•\XenyUa 'I'ullberg, " Om Skand. Poduridor nf undrrfam. 

 Lipurina^," Akad. Afh. UpsaJa, lH()i), p. 11. 



*Xenylla obscura, sp. n. (PI. VJ. fiys. f) 9.) 

 Denies furculm cum. mucronibus tibia', /.(rru/liudtne cequales. 

 Spince anales parvm, arcicato', 2^cipillis crassia affurc. Fili clavati 

 ■in tihiis nulli. Long. 75 mm. 



Bead.- The ei/es as in other species of the genus. 



J^egs. — The claws of the feet all similar, unarmed. Near the 

 apexof each tibia is a, slender tapei'ing seta, (lig. D) ; ienemt liairs 

 absent. 



F'lircula. — 'I'lie dens and m.vcro together ecjual to the tibia in 

 length — a little longer than the manubrium. 'J.'he m/acrones not 

 fused with the dentes, slender, and very slightly curved at their 

 apices (tigs. 5 & 7), 



Umnula. — A little shorter than the dens; the rami tri-dentate, 

 the innermost tooth the largest (fig. 8). 



Anal Spines. — Small and stout, curved. 'I'he papilhe from 

 which they arise small and short (fig. 6). 



Coloration. — Leaden purple with a number of small irregnla.r 

 yellowish markings on the dorsal aspect of the head and trunk. 

 'J'he legs, furcuhi, and ventral aspect of the body pale, almost 

 white. The eyes on a black patch on each side of the head. 



Length -75-1 mm. ; average length -75 mm. 



Eighteen specimens from Simla, altitude circa 7000 ft., where 

 they were found floating in large numbers on the surface of pools 

 of a stream (A\ Annandale, May 11th, 1908). 



No. ^v- Indian Museum Coll. 



Id 



This species is a little smaller than most species of the genus. 

 It resembles Xenylla hiimiicola (0. Fabr.) TuUb. in having the 

 mucro free and not fused up with the dens, though the separation 

 in X. humicola is rather more marked when viewed from the 

 dorsal aspect than in the present species. From X. h,umicola, it is 

 further distinguished — (a) by the absence of tenent hairs from 



