Some Habits and Hosts of Bird Ceratophytti. 81 



Fig. 1. Head of <£ 



The antenna of Ceratophyllus consists of three joints, the first and second being simple, while 

 the third has nine divisions. In Fig. 1, the second joint appears to be compound, but the shaded 

 area is really the first division of the third joint which is deeply inset in the second. To the 

 second also belongs the pencil of long hairs. 



Fig, 2, 7th sternite <J. 



Fig. 3. 8th tergite £. 



