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HYMENOPTERA 637
5. Body flea-like or compressed laterally, antenrue not elbowed, trochanters
usually undivided; wings with simple venation (Fig, 223)
CYNIPOIDEA p. 646
Body not flea-like . . . 6
6. Wing venation well developed, with basal, median, and subcostal veins
present with others . "" . 7
Wing venation reduced, with only subcostal and part of radial veins
present. (Pointed-tailed Wasps.) . SERPHOIDEA p. 662
7. Trochanters divided into two parts . ICHNEUMONOIDEA
Trochanters undivided. 14
8. Body fiea-like or compressed laterally. (Gallfiies.) CYNIPOIDEA p. 646
Body not fiea-like " 9
9. Body densely hairy. (Paper Wasps.) . VESPOIDEA p. 689
Body not specially hairy . . . 10
10. First abdominal segment slightly or strongly bent. (Ichneumon Flies.)
ICHNEUMONOlDEA
First abdominal segment straight. , . SERPHOlDEA p. 662
11. Fore femora normal or clubbed distally; hind wings without anal
lobe. (Pointed-tailed Wasps.) . . SERPHOIDEA p. 662
Fore femora greatly swollen or dubbed distally; hind wings with distinct
anal lobe. (Bethyloid Wasps.) BETHYLOIDEA p. 665
12. Hairs on mesonotum and scutellum branched or plumose; hind tibia;
and tarsal segment I usually enlarged. (Bees.) . APOIDEA p. 701
Hairs on mesonotum and scutellum not branched but sometimes
twisted 13
13. Abdomen with but three dorsal segments visible. (Cuckoo or Gold
Wasps.) . CHRYSIDOIDEA p.682
Abdomen with more than three dorsal segments visible. (Sphecoid
Wasps.) . ..,. . SPHECOIDEA p.683
14. Mandibles with cutting edges turning inward and their apices meeting
or overlapping; sting well developed. (Paper Wasps.). VESPOIDEA p.689
Mandibles with cutting edges turning outward and their apices not
meeting or overlapping; abdomen with a median longitudinal fold.
(Ichneumon Parasites.). • ICHNEUMONOIDEA
IV. Superfamily ICHNEUMONOIDEA Konow 1897
(Ich'neu-mon-oi'de-a, from the Greek lXpEUJ.LWV, a small wasp that
hunts spiders; literally, a tracker.) Ichneumon Flies, Ichnew.non
Wasps, Ichneumonids, Long-tailed Wasps.
A very large family of parasitic wasps which prey mostly upon the immature
stages of many orders of insects and parasitize those chiefly of the COLEOP­
TERA, LEPIDOPTERA, HYMENOPTERA, and DIPTERA. The members
are mostly slender species with divided trochanters, and the female normally
has a long exserted ovipositor that issues ventrally some distance before the tip
of the abdomen.