( 532 ) 



besides two or three small ventral bristles (text-fig. 4). The large movable flap 

 of the clasper (F) is three times as long as it is broad at the widest point 

 (45 : 14), being longer and a little narrower than in wollastoni. The long 

 bristles situated on this flap are slightly less nnmerous than in icoUiisfoni, and 

 the small bristles, of which there are ten to twelve in the middle area near the 

 dorsal margin on the inner surface of the flap in wollastoni, are replaced in the 

 new species by two to four slender bristles. The ninth sternite, which is rounded 

 at the apex of the ventral arm in toollastoni, has this apex ronnded dorsally, 

 but angulate ventrally in the new species (IX. st.). Moreover, the bristles on 

 this segment are much less numerous than in wollastoni. 



? . The dilated ventral portion of the eighth tergite (text-fig. 5, VIII. t.) is 

 divided by a round apical sinus into a pointed upper lobe and a broader and 

 rounded lower one. The upper portion of this ventral lobe is internally incrassate, 

 and bears at the apical margin five thin bristles, of wliich two are short, and 

 near the margin on the outer surface a transverse row of four long ones. The 



Fig. 5. — Cteiiocephalus Cdfiver.iu.t, 



segment has, in addition, three bristles more proximal and more ventral in 

 position, and one long one further up the side. The eighth sternite, which 

 is small and elongate, does not bear any bristles. The stylet is very slender, 

 conical, being four times as long as it is broad at the base. The receptaculum 

 seminis (R.S.) has a globular head, which is shorter than the tail. 



Length (mounted specimens) : S 2'6 mm , ? 3'3 mm. 



1 S (typej from Mutaragwa, Aberdare Mts., British East Africa, March 15, 

 1910, off Lophuromys testudo. 



1 ? from Mutaragwa, March 17, 1910, off Dendrohijrax ciawshayi. 



1 c? from Mutaragwa, March 23, 1910, of}' Genctta stiihlmanni. 



12. Ctenocephalus craterus spec. nov. (text-figs. 6, 7, and 8). 



cJ ? . A most interesting species, which connects the preceding one with 

 Ct. eanis und /elis. In the high head, the position of the eye, the length of the 

 maxillary and labial palpi, and the size of the antennae, Cf. cmterns resembles 

 Ct. wollastoni and conrersus, but it agrees with Ct. canis and felts in the position 



