LIBRARY

HYMENOPTERA
KEY TO IMPORTANT FAMILIES 1
1. Hind wings neither linear nor pedlUlculate at base; ovipositor issues
far in front of tip of abdomen; antenrue elbowed and with one, two,
or three ring joints, very rarely without ring joints '" 2
Hind wings linear, pedunculate at base; ovipositor usually issues
just in front of tip of abdomen; antennre in female most frequently
terminates in a distinct fusiform or egg-shaped solid club, more
rarely in a two-segmented club . .. ... MYMARIDlE p. 660
2. Tarsi four- or five-segmented; fore tibire armed with a large curved
spur; antennre usually many-segmented . . 3
Tarsi usually four-segmented, rarely three-segmented; very rarely
heteromerous; fore tibire with a delicate short straight spur; antennre
usually with few segments, at most nine-segmented 16
3. Hind femora much swollen 5
Hind femora not greatly enlarged. 4
4. Males always aptcrous; abdomen broadly sessile, long and tubular,
thickened at base, or broadened apically with a tubercle or filamentat
each apical angle, (Fig Wasps.) . . AGAONTIDlE p.654
Males most often winged. rarely apterous; if apterous, the abdomen
is normal and not long and tubular. . 6
5. Fore wings, when at rest. folded longitudinally; ovipositor curved
over dorsum of abdomen . LEUCOSPIDIDlE
Fore wings not folded; ovipositor not curved over dorsum of abdomen.
(Chalcid Flies.) ,CHALCIDIDlE p. 652
6. Thorax strongly developed, much arched, and deeply punctate 7
Thorax not strongly developed 8
7. Stigmal vein not well developed. always short and subsessile; second
abdominal segment very large and usually encloses other segments
EUCHARITIDlE
Stigmal vein developed i all abdominal segments visible. PERILAMPID..E p. 653
8. Pronotum large; antennre many-segmented; notaulices complete. 9
Pronotum sman, frequently not visible in the middle; antennre usually
with few segments 10
9. Hind coxa! greatly enlarged; ovipositor not prominent; body not
metallic; sides of Beutel almost straight EURYTOMIDlE p. 655
Hind eoxre normal; ovipositor often exserted; body usually metallic;
sides of Beutel curved. . (TORYMIDJE) CALLlMOMIDlE p. 653
10. Mesosternal pleurre not visible; middle legs long, saltatorial, with a very
long tibial spur . 11
Mesosternal pleurre distinct; middle legs not saltatorial, first tarsal
segment not swollen 13
11. Antennre more than six-segmented 12
Antennre six"segmented: marginal vein about as long as subcostal
vein .. . SIGNIPHORIDlE p. 657
12. Antenn!!! usually I3-segmented; occipital margin of vertex rounded
EUPELMIDlE
Antennoo usually n-segmented; occipital margin ot vertex usually
acute; notaulices obliterated ENCYRTIDlE p. 656
I After Viereck, H;ymenoptera oj Connecticut. pp. 444--446, 1916.
651