1 8 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
i. Dermatophilus ) with two species (penetrans and caecatd), from South America, 
penetrans being also introduced into Africa. 
Rostrum consisting of two segments. Head not divided by a groove or an 
internal thickening from the antennal groove upwards. Thoracic tergites in the dorsal 
line together less than half the length of the first abdominal tergite. Prosternite not 
produced posteriorly into a distinct conical tooth. Pygidial plate without grooves in 
the mesial line, each side bearing eight grooves. Hind coxa produced anteriorly at 
the apex into a tooth ; no patch of spines on the inner side. Hind femur simple. 
Tibiae with three pairs of dorsal bristles. Tarsi very slender ; some apical bristles of 
segments two, three, and four of hind tarsus very long and thin ; fifth segment linear, 
about eight times as long as it is broad, with a few long and thin hairs ; claw slender, 
without basal projection. Female without anal stylet and without stigma on first, 
second, and third abdominal tergites. 
1. Hectopsylla, with four species (psittaci, pulex, and two sp. nov.), from South 
America. 
Rostrum consisting of three segments. Head not divided by a groove or an 
internal thickening from the antennal groove upwards. Pygidial plate as in Dermato- 
philus. Abdominal tergites two to eight with a stigma in both sexes. Hind coxa 
without patch of spines on inner side. Hind femur produced ventrally at the base 
into a prominent hook, behind which the femur is deeply sinuate. Some of the 
bristles of the hind tibia and tarsus very long. Anal segment of female without 
stylet. Tergites two to eight with stigma in both sexes. 
3. Echidnophaga, with eight species (ga//inaceus, mitrina, ambulans^ and five new 
ones), from Africa, Europe, Asia, and Australia, gallinaceus being introduced also into 
America. 
Rostrum consisting of two segments. Head divided by a groove or an internal 
thickening from the antennal groove upwards. Abdominal tergites two to eight with 
a stigma in both sexes. Pygidial plate not divided in the mesial line, bearing on each 
side thirteen or fourteen grooves. Hind coxa anteriorly produced at the apex into a 
broad tooth and bearing on the inner side a patch of spines. Hind femur simple. 
Bristles of legs shorter than in Hectopsyl/a. Anal segment of female with stylet. 
Tergites two to eight with stigma in both sexes. 
All the other Siphonaptera can be placed into two more families, according to our 
provisional classification : 
II. Family Puiicidae Taschenb. (1880). 
Rostrum more or less strongly chitinized, consisting of five or more segments 
inclusive of the unpaired basal one. Thoracical tergites together longer than first 
abdominal tergite. Here belong the majority of Siphonaptera. 
