1967] 
Mockford — Electrentomoid Psocids 
121 
Artificial key to the genera of electrentomoid Psocoptera 
i a. Vein M in hind wing simple 3. 
ib. Vein M in hindwing branched 2. 
2a. First segment of Rs in hindwing present. Forewing membrane 
covered with tiny scale-like structures Compsocus 
Banks ( C . elegans Banks). 
2b. First segment of Rs in hindwing absent. Micro-vesliture of 
forewing membrane in form of short points Elec- 
trentomopsis , n. gen. (E. variegatus, n. sp.). 
3a. Pterostigma closed basally 4- 
3b. Pterostigma open basally 8. 
4a. Cubital loop joined to M 3 by a crossvein Protroc- 
topsocusj, n. gen. (P. enigmaticus, n. sp.) 
4b. Cubital loop not joined to M 5- 
5a. First segment of Rs in hindwing present Parelec- 
trentomum Roesler (P. priscum Roesler, Oligocene, Baltic 
amber) . 
5b. First segment of Rs in hindwing absent 6. 
6a. With 15 antennal segments 7* 
6b. With 13 antennal segments Electrentomum Ender- 
lein (F. klebsianum Enderlein, Oligocene, Baltic amber). 
7a. Vein 2A of forewing not joining iA; R x in forewing widened 
to form a dark spot in region of its junction with wing mar- 
gin Manicapsocus Smithers (M. alettae Smithers, 
Rhodesia) . 
7b. Vein 2A in forewing joining iA; Ri normal Epi- 
troctes J n. gen. (E. tuxtlarum , n. sp.). 
8a. Cubital loop joined to M 3 Troctopsocus (new name 
for Plaumannia Roesler). 
8b. Cubital loop not joined to M 3 9. 
9a. Two claws of each pretarsus alike, each with two preapical 
teeth T'roctopsoculus , n. gen. (T. morenus , n. sp.). 
9b. Two claws of each pretarsus unlike: anterior claw (of each 
pretarsus) bearing membranous cowl-like swelling enclosing all 
but tip of claw shaft 10. 
10a. Pterostigma broader than preceding cell. Wings unmarked ... 
Musapsocus , n. gen. 
10b. Pterostigma narrower than preceding cell. Forewing marked 
with a vague pattern Troctopsocopsis , n. gen. 
