PEDICULID2E. 
763 
Giebel (“ Insecta Epizoa ”) separates the Lice into four genera 
according to the following characters :— 
A. Antennae five-jointed. 
(1) Thorax not sharply separated from abdomen. Phthirius. 
(2) Thorax sharply separated from abdomen. 
(a) Thorax almost as broad as abdomen .. Pediculus. 
(b) Thorax a good deal narrower than 
the broad abdomen .. . . Hcematopinus . 
B. Antennae, three-jointed .. .. Pedicinus. 
Of these four genera the first two comprise the human parasites. 
Pediculus capitis is very similar to P. vestimenti; the latter however has 
antennae a little longer than in P. capitis , and the second antennal joint 
a little longer than the others, while in P. capitis all the antennal joints are 
about the same length. Species of the genus Pedicinus are found on 
monkeys, while in this classification Hcematopinus comprises all the lice 
found on other warm-blooded animals. The Indian species of this last 
genus are evidently fairly numerous, but they have not been worked out. 
The interest of the group has been considerably increased by the 
discovery that Pediculi may act as carriers of a fever-producing 
parasite. (Mackie, B. M. J.) 
The most recent classification by Dalla Torre (Genera Insectorum 
Fasc. 81) is considerably more elaborate than Giebel’s. He regards 
the Anoplura as composed of four families differentiated as follows :— 
A. Legs not provided with clasping claws ; 
tibiae and tarsi slender, the latter with¬ 
out any thumb-like process. Mouth 
at the extremity of a long tubular 
process. 
Antennae 5-jointed 
including the Indian Elephant’s louse. 
B. Legs with clasping claws, tibiae stout 
with a thumb-like process. Antennae 
3 to 5-jointed. Body flattened. A 
stigma on the mesothorax and on 
abdominal segments 3-8— 
Eyes large, dark and prominent .. 
Eyes obscure or absent 
H cematomyzidce. 
H cematomyzus eleplnantis . 
Pediculidce. 
Hcematopinidce. 
