Identify families
SUBORDERS
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- Antennae more than 20-segmented, never secondarily annulated; tarsi 3-segmented; pterostigma not thickened, or absent; paraprocts with strong posterior spine TROGIOMORPHA
- Antennae usually 13-segmented, if 12- or 15–17-segmented, some segments are secondarily annulated; tarsi 2- or 3-segmented; pterostigma thickened or not; paraprocts without strong posterior spine 2
- (1)
- Antennae 12- or 15–-17-segmented, some segments secondarily annulated; tarsi 3-segmented; pterostigma not thickened TROCTOMORPHA
- Antennae usually 13-segmented; tarsi 2- or 3-segmented, if latter then flagellar segments not secondarily annulated; pterostigma thickened PSOCOMORPHA
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Trogiomorpha
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- Head long and vertical; maxillary palp without sensillum on 2nd segment; CuP and 1A end together at wing margin (nodulus) PSOCATHROPETAE. Psyllipsocidae
- Head short; inner side of 2nd segment of maxillary palp with sensillum; in winged forms CuP and 1A end separately at wing margin ATROPETAE. 2
- (1)
- Claws with preapical tooth; body and wings usually scaly; if scales absent fore wings are acuminate Lepidopsocidae
- Claws toothed; body and wings never scaly; fore wings rounded or absent 3
- (2)
- Fore wings well developed or shortened but always with veins; hind wings usually reduced Psoquillidae
- Fore wings present only as veinless flaps, or absent; hind wings absent Trogiidae
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Troctomorpha
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- (1)
- Wings, when present, with complete venation. (In both alate and apterous forms eyes seated near vertex; thoracic sterna narrow, without cilia; hind femora not basally widened) Pachytroctidae
- Wings, when present, with incomplete venation, lacking terminal branches. (In all apterous forms meso- and metathorax indistinguishably fused) 3
- (2)
- In alate forms both fore and hind wings present; eyes near vertex. In apterous forms eyes remote from vertex, each consisting of 2 large elements alone or preceded by 6 or fewer small ocelloids. Pronotum lobed; thoracic sterna broad and bearing cilia; hind femora broad basally Liposcelidae
- In alate forms only fore wings present, convex, elytriform. In all forms eyes remote from vertex, composed of few ocelloids, none greatly enlarged; pronotum simple; thoracic sterna narrow, without cilia; hind femora not widened basally Sphaeropsocidae
Psocomorpha
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- Adults macropterous 2
- Adults brachypterous or apterous 25
- (1)
- Labrum with 2 narrow, sclerotised bands or ridges from base to distal margin Epipsocidae
- Labrum without such bands or ridges 3
- (2)
- Tarsi 3-segmented 4
- Tarsi 2-segmented 10
- (3)
- Fore wings glabrous 5
- Fore wings with at least a few setae on veins and/or margin 8
- (4)
- Areola postica free 7
- CuA1 fused with M for a length 6
- (5)
- Wing pattern of dense spots and blotches Myopsocidae
- Wing pattern of bold dark and light areas Elipsocidae (pt.)
- (5)
- Areola postica shallow, extending well basal to junction of CuA2 and wing margin; fore wing with cloudy pattern Psilopsocidae
- Areola postica tall, arched not extending basal to junction of CuA2 and wing margin; fore wing hyaline except for pterostigma Mesopsocidae (pt.)
- (4)
- Tarsal claws without preapical tooth Pseudocaeciliidae (pt.)
- Tarsal claws with preapical tooth 9
- (8)
- Hind wing with marginal setae only between R2+3 and R4+5 Elipsocidae (pt.)
- Hind wing with marginal setae along most of margin and posterior to R2+3 Philotarsidae (pt.)
- (3)
- Fore wing venation indistinct Archipsocidae (pt.)
- Fore wing venation distinct 11
- (10)
- Areola postica present 13
- Areola postica absent 12
- (11)
- Pterostigma more or less rectangular. Hind wing with Rs and M usually joined by a cross-vein (fused only in Interpsocus) Ectopsocidae (pt.)
- Pterostigma with clearly sinuous hind margin. Hind wing with Rs and M fused for a length Peripsocidae (pt.)
- (11)
- Fore wing with at least a few setae on veins and/or margin 15
- Fore wings glabrous 14
- (13)
- (13)
- M 2-branched in fore wing 16
- M 3-branched in fore wing 18
- (15)
- Areola postica joined to M by a cross-vein Hemipsocidae
- Areola postica free 17
- (16)
- (15)
- Areola postica joined to M 19
- Areola postica free 21
- (18)
- Network of veins at least behind pterostigma, frequently more extensive Calopsocidae (pt.)
- No network of veins behind pterostigma 20
- (19)
- Pterostigma long and narrow Amphipsocidae
- Pterostigma with distinct widening in distal half Psocidae (pt.)
- (19)
- Single row of setae on veins of fore wings 23
- Setae on veins of fore wing in two rows 22
- (21)
- (21)
- Cross-vein between pterostigma and Rs Stenopsocidae
- No cross-vein between pterostigma and Rs 24
- (23)
- Hind wing with apical and/or posterior marginal setae alternately longer and shorter Trichopsocidae
- Hind wing with apical and/or posterior marginal setae all of similar length Caeciliidae (pt.)
- (2)
- Tarsi 3-segmented 26
- Tarsi 2-segmented 28
- (25)
- Reduced wings with at least some setae present 27
- Reduced wings with indistinct venation, glabrous Mesopsocidae (pt.)
- (26)
- Setae on fore wing veins arising from dark spots Philotarsidae (pt.)
- Setae on fore wing veins not arising from dark spots Elipsocidae (pt.)
- (25)
- Brachypterous 30
- Apterous 29
- (28)
- Head and body with glandular setae; claws with preapical tooth Elipsocidae (pt.)
- Head and body without glandular setae; claws without preapical tooth Archipsocidae (pt.)
- (28)
- Claws without preapical tooth 31
- Claws with preapical tooth 32
- (30)
- (30)
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