( 540 ) 



1. Ceratophyllus gallinae* (Schrank), figs. l. 2. 6. d 10. 13. 17. 19. ?. 



PvZex gcdlinae Schrank, Fauna Boica III. p. 195 (1804). 



Both sexes are very dark in colour. The head bears numerous hairs irregularly 

 scattered over its surface. Those, i.e., some half dozen, just anterior to the eye, are 

 somewhat longer and stouter than the others. On the posterior edge of the head 

 tliere are a few long thin hairs. The pal[ii in ihe female are as long as the rostrum. 

 The number of teeth in the pronotal comb appears to vary; some specimens of both 

 sexes having as many as thirty, while in others the number is reduced to twenty-six. 

 The epimeron of the mesothorax is well developed, and, as in the genus Ceratopsylla, 

 the suture between the fused epimeron and episternum is plainly visible. 



The first five abdominal tergites in the male and the first four in the/e«ia/e bear 

 at their posterior edges on each side short strongly chitinised spines. These spines 

 vary in number, though there are apparently never more than four on each side. 

 The fifth tergite in the female bears one or two spines. The first tergite in both 

 sexes bears three rows of hairs, the anterior row consisting of short and the posterior 

 of long hairs. In addition to these the tergite bears a few long hairs scattered 

 irregularly over its dorsal surface. The next five tergites in both sexes bear two 

 rows of hairs, the anterior row consisting of short bristles and the posterior row of 

 long ones. There are also a few single hairs placed dorsally before the middle. 

 The posterior edge of the seventh tergite in the male bears on each side one long 

 and two very short bristles, the ratio between the lengths of these bristles being 

 100 : 12. In the female these hairs are also present, their relative lengths, however, 

 are in the ratio of 100 : 45. 



The sternite of the second segment is identical in both sexes, it bears some 

 minute hairs laterally near its anterior edge, and two single thin hairs close to the 

 middle line, one on each side. The third sternite has three hairs on each side. The 

 fourth has three long, and one or two short hairs before them on each side in both 

 sexes. The fifth is similar in both sexes, having three large and two or three small 

 hairs on each side, the sixth in both sexes bears three long and three short 

 bristles. The seventh sternite in the male bears two long and one shorter 

 bristle, and also a few smaller hairs. The seventh sternite in the female is, as usual, 

 enlarged. The mesial sinus is triangular in shape, the lobes being regularly rounded 

 as shown in fig. 13. The number of hairs and their position on the segment varies a 

 little. A comparison, however, of figs. 13 to 16 will show that the seventh sternites 

 of all the four species herein treated of are abundantly distinct from each other. In 

 figs. 17 and 18 the segment is represented in situ in side view. 



The coxae and femora of the forelegs are sparsely covered with small hairs. The 

 posterior edges of the coxae bear a single long hair. The ends of the femora bear 

 a strongly chitinised bristle curving downwards. At the ends of the tibiae on the 

 anterior edge are one long and one short strongly chitinised spines, and on the 

 posterior edge there are ten similar spines. The femora of the middle legs have one 

 long and one short chitinous spine curving downwards at their ends. The anterior 

 edges of the tibiae bear one long, one shorter, and four short strongly chitinised 

 spines at their ends. On the posterior edges there are twelve strongly 

 chitinised spines. 



• Ceratophyllus rf Wagner. Aphanipterdogiiche Studien III. Hot. Soc. Btit. Jtot». t. XXXI. 

 p. 567 (1898). 



