56 rMarch, 



In some examples the prothoracic comb is reduced to one spine on 

 each side ; it is therefore possible that examples occur in Avhicli the 

 comb is entirely absent. 



(^ . Pygidium strongly convex. Clasper with a very large flap 

 rounded dorsally and incurved ventrally, the upper edge bearing 

 numerous short bristles. Manubrium very slender and nearly straight. 



$ . Eighth tergite with several bristles placed at or near the 

 edge, only one situated on the lateral surface. Eeceptaculum seminis 

 broad, its head twice as long as the tail and, on the dorsal side beyond 

 the centre, strongly incurved. 



Common on the hedgehog (Erinaceus europaeus) and occasionally 

 on the fox ( Vulpes vulpes) . 



IV. Genus: CTENOCEPHALUS Kohn. (1869). 



Grenal comb horizontal, consisting (in the British species) of seven 

 or eight spines on each side and one spine at the apex of the geual lobe, 

 the spines pointed and recui'ved (figs. 4, 5). A strong incrassation 

 from the antennal groove upwards. Prothoracic comb of about 16-18 

 teeth. 



Six species are known, four being purely Ethiopian, and two 

 almost cosmopolitan. 



4. Ctengcephaltjs canis Curtis (1826). 



(Figs. 4. 10). 



Frons strongly rounded in both sexes. Stigmata large. Distance 

 from frontal corner across eye to anterior edge of antennal groove 

 equal to the distance from the eighth genal spine to the vertex. 



J'. Clasper with one sole-shaped flap, beneath which there is a 

 small triangular process (fig. 10) . The flap bears numerous hairs along 

 the edge, with the exception of the basal third of the dorsal margin 

 and the basal three-fourths of the ventral margin, which are devoid of 

 hairs and more strongly chitinised. Manubrium (m) straight and 

 narrow, widened at the apex into a spatula. 



Common on the domestic dog and cat, but far rarer than C. feMs. 



6. CXENOCEPHALUS FELIS BoucM (1835). 



(Figs. 5, 11). 



Previously usually confounded with canis, differs in its much 

 longer head, the distance from the frontal corner across eye to the 



