APPENDIX A 109 



Abdomen of ten segments of which the steruite of 

 the first segment is suppressed. Abdomen enormously 

 swollen in pregnant females of certain species. Combs 

 frequently present on head, thorax, and abdomen. 

 Legs developed for leaping. Coxa powerful; femur 

 thickened ; tarsi of five segments, ending in two claws 

 on the distal segment. Metamorphosis complete. 

 Larva of thirteen segments. Pupa enveloped in silken 

 cocoon. Imago a temporary parasite (usually) on 

 warm-blooded vertebrates. 



I. Family Sarcopsyllidce. Taschenberg (1880). 



Rostrum (= labium + labial palpi) rather long 

 but very weak and pale, consisting of two or three 

 segments inclusive of the unpaired basal segment. 

 Genal edge of head always produced downwards into 

 a triangular process situated behind the insertion of 

 the maxillse at the ventral oral angle. Thoracical 

 tergites together shorter than first abdominal tergite. 



To this group belong the chigoes and their allies, 

 the most truly parasitic fleas. About fourteen species 

 have been described, which can be grouped into three 

 genera, viz. Dermatophilus, Hectopsylla, Echidno- 

 phaga. 



II. Family Pulicidce. Taschenberg (1880). 



Rostrum (= labium + labial palpi) more or less 

 strongly chitinized, consisting, except in a few cases, 



