P;ick;ir.i.l 
328 
[May 2, 
Fig. 12. Head of Pulex cauis $ ; most of the spines omitted; hyp, 
hypopliarynx ; rnx', second maxilla, or labium; mx.'p, second maxillary 
palpi (antennae omitted) . 
*nd 
Fig. 13. A, head of Pulex caiiis '^ (antennae omitted) ; B, the last 
two segments of the body, vii, viii, in the lower part of the 7tli segment 
is a kidney-shaped organ (x) not seen in ^f ; C\ edge of tergal portion of 
8tli segment, with the 8th spiracle (sp) enlarged. 
