LZ EN TOMOLOGY 
ments, and a pair of stout biarticulate cerci. Integument deli- 
cate. Not social in habit. Examples, Embia, Oligotoma 
(Fig. 15). Some twenty species, all from warm climates. 
These insects are most 
nearly related to Termit- 
idee and Psocide. 
Psocide. — Eyes facet- 
ted. Antenne 13-50 
jointed. Mouth © parts 
hypognathous. — Protho- 
rax reduced. Wings 
present, rudimentary or 
absent; front pair the 
larger; veins few and ir- 
Oligotoma michaeli. Length, 10.5 mm.—After 
regular. Abdomen with 
McLacHtian. ss 
nine or ten segments and 
no cerci. Integument delicate. Example, Psocus (Fig. 16). 
About two hundred species. 
Comstock raises Psocidze to the rank of an order, for which 
he employs, in a new sense, Brauer’s term Corrodentia. 
Suborder Mallophaga.—\V inegless flattened insects, of para- 
sitic habit. Head large. Eyes consisting of a few isolated 
ocelli or else absent. An- 
tennze 3-5 jointed. Mouth 
parts prognathous. — Pro- 
Fic. 106. 
thorax distinct; mesotho- 
rax often and metathorax 
usually transferred to the 
abdominal region. Ab- 
Psocus venosus. Length, 5 mm. 
dominal segments eight to 
ten in number; no cerei. Parasitic upon birds and a few mam- 
mals. Example, Menopon (Fig. 17). More than fifteen 
hundred species have been described. 
Packard's order Platyptera originally included Perlide. 
srauer’s order Corrodentia consisted of Termitide, Psocide 
and Mallophaga; Perlidze being set apart as an order (Plecop- 
