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sternite bears fuui- bristles on each side, these bristles being slenderer than in the 

 species named above, partionlarly the first and second bristles. 



Length : cJS— 2 mm., ? 2—2-4 mm. 



We obtained a series of both sexes at Alger in March, A{)ril, and May 1912, 

 also some ? ? in May 1908— altogether 18 tJc? and 27 ¥ ?. Most of the specimens 

 were found ou Ciocidtira russula, and a few on Mus algirus and Apoc/emus sylvaticus, 

 and one on Gerbillas campestris. The occurrence on the last three hosts is doubtless 

 accidental. Although we obtained a number of Crocidura russula at Hammam 

 Rirha. as well as many M. algirus and A. s;/lcaticus, the present species of flea was 

 conspicuous by its absence. 



Rhadinopsylla gen. nov. 



(??. Frons without tubercle, or this ciuite e.Kternal, not placed in a groove. 

 Antenual groove completely closed above, there being no sulcus across the vertex and 

 the internal incrassatiou only being vestigial. A genal comb of five spines. Eye 

 barely traceable. Labial palpi with five segments, the last segment posteriorly 

 with a curved apical bristle as in true Ctenophthalmiis. Pronotum with comb. 

 Episternum of mefathorax prolonged downwards, hind edge of sternum shortened; 

 epimerum of metathorax narrower and dorsally more rounded than in Cteriopktkalmas, 

 very densely striated above the ventral margin ; its stigma mnch more frontal than 

 in the allied forms, being placed nearly half-way between the oblique upper edge 

 and the anterior edge of the metepimerum. Metanotum without the short strong 

 apical spines found on the proximal abdominal tergites, but with minute teeth. 

 No autepygidial bristles in the c?, but two on each side in ? , both being long. 

 Pygidiuni strongly convex in both sexes. Legs slender, particularly the femora. 

 Basal internal rod of mid-coxa broad, bearing a mesial carina and therefore some- 

 what recalling a shoulder-blade, the corresponding rod of the hind-coxa narrow and 

 quite short. Hind-coxa with a j)atch of short spiniform bristles on the inner 

 surface. The fifth segment of all the tarsi with four pairs of lateral bristles as in 

 the hiud-tarsus of true Seojjsi/lla. 



Genotype : R. masciilana spec. nov. 



The genus is closely allied to both Neopsi/lla Wagner (1902)and Cteriop//t/mlmus 

 Koleu. (1856), but distinguished by the characters mentioned above. Besides the 

 type two other species belong here : pentacanthus Roths. (1897) and isacanthus 

 Roths. (1907). They agree closely with masculana, but have the frons not produced 

 into a sharp angle, whereas they bear a small frontal tubercle, which is absent from 

 masculana 



10. Rhadinopsylla masculana spec. nov. (PI. XI. tig. 14, 15 and 16). 



Jhac/.—We figure the head of the ? (PI. XI. fig. 14). That of the cJ difiers in 

 the frons being more convex between auteunal groove and frontal corner, and in the 

 occiput being longer than in the ¥. The frontal j)art of the head bears in both 

 sexes an anterior row of six bristles as shown in the figure, and between this row 

 and the comb two longer bristles. The first spine of the comb is the smallest, the 

 last (or most dorsal) the broadest, and the third and fourth the longest. The 

 antenual groove extends farther upwards in the d than in the ? ; the optical dorsal 

 outline of the head is slightly incrassate above the antenual groove, but uot 

 interrupted. The occiput has three rows of bristles. There is no row of short 



