1908.] 79 



Abdomen.— The abdominal fcergites hare four rows of bristles, the anterior row 

 being irregular. There are, moreover, on the sides of the second, third and fourth 

 tergites some short apical teeth (4 or 5,:}, 2) homologous to the combs of Ht/dri- 

 chopsylla. The seventh tergite bears three long apical bristles on each side. The 

 Bternites bear all a patch of numerous bristles, which are arranged in four or more 

 rows. 



Legs.— The posterior apical sinus of the mid and hind coxae is nearly semi- 

 circular. The mid and hind femora bear five bristles externally before the apex. 

 The spine-like bristles of the ventral tibise and tarsi are black. The fourth hind 

 tarsal segment is nearly thrice as long as it is broad. Proportions of segments :— 



1st. 2nd. 3rd. 4th. 5th. 



Mid tarsus 45 ... 25 ... 13 ... 10 ... 22 



Hind tarsus SO ... 55 ... 33 ... 19 ... 24 



Modified segments.— The eighth tergite is very hairy, bearing numerous bristles 

 above the stigma, and from the stigma to the ventral edge. Three long and stout 

 bristles stand at the apical margin, the row being continued ventrally by several 

 long bristles. The seventh sternite is sinuate. The sinus is broad and shallow, the 

 upper lobe of the sclerite being very short and broad, and the lower one strongly 

 rounded. The stylet is long and slender. Length 58 mm. 



One ? from the Ruwenzori, 8,000 ft., January 1906, off a mouse. 



5. — Ctenopstllus iETHiopicus, Rothseh. 



We described this species originally from both sexes, collected 

 by Professor Yngve Sjostedt on his Kilimandjaro Expedition at 

 Kibonoto. The species is similar to C. musculi, Duges (1832), but 

 differs very essentially in the genitalia. In the J , of which sex 

 Mr. Wollaston did not procure a specimen, the long movable " finger " 

 of the clasper is dilated towards the apex, the eighth sternite is 

 triangular in lateral aspect, bearing several long bristles at the apex, 

 and the horizontal arm of the ninth sternite terminates in a hook. 

 The bristles on the eighth abdominal tergite of the ? are more 

 numerous than in C. musculi, and the apical edge of this sclerite is 

 more deeply sinuate than in that insect. The head bears three genal 

 spines in both sexes. Two or three bristle- of the frontal row of the 

 head are spine-like, being shorter and thicker than the other bristles 

 of the same row. 



Mr. Wollaston obtained one ? off a mouse, Ruvvenzori, January 



loth, 1906. 



EXPLANATION OF PLATE I. 



Fig. 1. Head of Ctenocephalus wollasloni. 



,, 2. Genitalia of the <J of the same. 



„ 3. Genitalia of the <J of Ceratophyllus stygius. 



„ 4. Head of Ctenopsgllus hirsutus. 



