86 [April 



1900. The hosts from which the examples from Shendi were taken 

 are Acomi/s Witherhyi, 3 specimens; Oerhillus rohuafus, 20 specimens ; 

 Arvicantliis testiculnris, 20 specimens ; Dipodilhts Wafersi, 1 specimen ; 

 Dipus jacuJus, 1 specimen : OeneMa dongoJann, 1 specimen. 



5. — PuLEx cnEPnRKKis, n. sp. 

 (Plate I, Fi<;. 7; Plate II, Figs. 14, IS). 



The briatles and hairs of tliis species are extremely stout, a good character for 

 its determination. The head is strongly rounded in front, the posterior portion 

 bearing two oblique scu'ies of bristles, besides a row on the hinder edge. The 

 palpus is a little longer than the maxilla, not reaching to the middle of the fore 

 coxa. The metathoracical epimeron bears two rows of bristles, while the abdominal 

 tergites have one only. The seventh tergite bears ouo long and two very short 

 apical bristles. In the male all the abdominal sternites have one bristle, while in 

 the female there are four, except on the first, where there is one. None of the 

 femora bear complete rows of hairs. The hind femur has two snbventral bristles 

 on the outside, and one lateral bristle on the inside, and in addition a few bristles 

 on the back. There is a prominent row of lateral bristles on the hind tibia, and 

 between this row and the hinder edge there are from three to four more bristles 

 stretching from the middle to the apex. The long apical bristle of (.he second seg- 

 ment of the hind tarsus reaches almost to the tip of the fourth segment. This 

 segment is almost triangular in shape, and scarcely half as long again as it is broad. 

 The fifth segment o'" the hind tarsus is as long as the third. In the male the 

 clasper (fig. 14a) bears two slender dorsal processes. The anterior one is the shorter, 

 and bears a very long apical bristle. The ninth sternite (fig. 14J) is lanceolate in 

 shape, and somewhat curved upwards, with a few fine hairs near the end. The 

 shape of the ]ilate of the penis is shown in the figure (19). In the female the seventh 

 sternite is triangular when viewed from Ihc side, and somewhat truncate at its 

 extreme end. The eighth tergite (fig. 7) bears two stout bristles below the stigma, and 

 another one somewhat lower down. Further back it bears a subapical series of from 

 five to seven less strongly chitinised bristles, and a few small hairs at the apex. 



We secured four sjiecimens of this interestinjj^ species at Cairo 

 in January, 1901, two ( (J $ ) from Dipus jac7iJns, and two (c? ? ) from 

 Acomys caliiriniis. 



6. — *Ptjlex Wttherbti, n. sp. 



(Plate I, Figs. 2, 5, G ; Plate II, Figs. 11, 15). 



A very distinct species. The palpus is but little shorter than the rostrum, 

 reaching to the end of the fore coxa. The abdominal sternites bear two hairs on 

 each side in both sexes. Tlie hind femur has a row of eight or nine lateral bristles, 

 one ventral bristle near the apex, and a tooth near the base. The hind libia 

 is very long, being four times as long as it is broad at the apex, and the 

 hairs on it are somewhat reduced in number (fig. 2). The fifth segment of the fore 



