542 Hod. N. C. Rothschild on new 



subccscatus. The description of subcacatus was already 

 printed when the specimens of curvispinus arrived, but the 

 hook in which the description appeared was only issued in 

 the second half of 1912. 



Although curvispinus is very remarkable on account of 

 the peculiar development of the ninth abdominal sternite 

 of the J , the species fits very well into Ceratophyllus as at 

 present composed. If the genus Ceratophyllus, however, 

 should require dividing up into a number of separate genera, 

 Paradoxopsyllus will probably be one of them. 



The two following species are so similar to curvispinus 

 that a lengthy description is not necessary : — 



4. Ceratophyllus teretifrons, sp. n. (PI. XV. fig. 5.) 



cJ ? . — The frons has no tubercle in either sex, whereas a 

 distinct frontal tubercle is present in both curvispinus and 

 in the new species described under no. 5. There are two 

 rows of bristles on the frons, the anterior row containing in 

 the $ 5 or 6 and in the $ 4 or 5 bristles, the second row 3 

 large bristles in both $ and ? . The occiput bears 2 or 3 

 bristles above the centre of the antennal groove, and in the 

 c? 10 or more small hairs along the antennal groove. The 

 long apical dorsal and ventral bristles of the hind tibia reach 

 to the apex of the first tarsal segment, and the second 

 segment has in both sexes two apical bristles extending 

 beyond the fourth segment, these bristles being particularly 

 long in the <J . In the $ of curvispinus a subapical dorsal 

 bristle of the second hind-tarsal segment also is much pro- 

 longed, which is not the case in C. teretifrons. The first 

 rnid-tarsal segment is at least one-eighth longer than the 

 second. 



In the S °f teretifrons (fig. 5) the eighth abdominal tergite 

 only bears four long bristles, there being no patch of bristles 

 on the sides, and the eighth sternite has on each side 3 or 4 

 bristles. The apical process P of the clasper is triangular, 

 not truncate. The movable process F is longer than in 

 curvispinus, its longest bristle being placed nearer the apex 

 and its posterior edge bearing 6 to 8 thin hairs. The ninth 

 sternite has the same peculiar shape as in curvispinus, but its 

 ventral arm differs in being less abruptly widened in the 

 centre and having here two slender bristles proximally to 

 the two long ones, instead of their being short and spiniform. 

 The apical hook of the penis is shorter and less slender than 

 in curvispinus. 



