1929 ] Classification of the Psocidae 323 
2. Forewings with a definite stigma; cubital fork de- 
veloped into an “areola postica” with a narrowed 
base, or else no cubital fork ; the first fork of median 
vein never reaches back to near base of stigma; anal 
and axillary end in one point; wings not scaled; 3 
ocelli; pronotum rarely distinct from above; antennae 
13 jointed; tarsi two- or three-jointed Psocidae 
No distinct stigma, if one apparent then wing scaled 
and the first fork of median vein reaches back nearly 
as far as base of apparent stigma; no areola postica 
with narrowed base, the cubital fork is a normal fork, 
usually long; anal and axillary often separate at tip; 
ocelli present or absent, antennae usually more than 
13 jointed; tarsi three-jointed; pronotum often dis- 
tinct from above 3 
3. Wings clothed with scales; both wings present, veins 
reach to margin Perientomidae 
Wings not with scales 4 
4. No hind wings, or extremely minute; venation re- 
duced, some very long bristles; no ocelli; anal and 
axillary separate, meso- and metathorax separated, 
pronotum visible from above Psoquillidae 
Hind wings of fair size; usually ocelli 5 
5. Venation complete, that is all main veins reach mar- 
gin, two or three branches end in costa, pronotum not 
particularly prominent from above; antennae 20 or 
more j oints Empheridae 
Venation reduced, some veins not reaching tip; 
pronotum very prominent from above; meso-and 
mefanotum separate; antennae 13 to 15 jointed, eyes 
not hairy Embidopsocidae 
Tables to Subfamilies and Tribes 
Atropidae 
Claws without tooth; meso- and metanotum separated; 
antennae 22 or more joints, wings absent or scale-like 
Atropinae 
