510 Dr. Rob. Lucas: Entomologie. Hymenoptera 1900. 
Head w. the cheeks rarely margined, the templ. a. the oceiput always 
immargined - 8. 
Head w. the cheeks a. occ. margined. 
Abd. not distinetl. sgmted, without sutures, or at most w. 2 or 3 
superfic. sutures, the dors. convex, the venter usually strongly 
concave, spir. of 1st sgm. rounded, placed very near the base 7. 
Abd. normal w. the usual sutures 2. 
. Abd. sess., the spiracl. of 1st sgm. placed much before the middle 5% 
Abd. petiol. or petiolif., the spir. placed at or a little behind the m, 
Subdisc. ». in fr.-wings originating from the base of the disc. n., or at 
least below its middle; all abd. sgms not flexible 3. 
Subdisc. n. usually interstit. or. originat. above the m. of the dise. n.; 
all abd. sgms flexible. Subfam. I. Aphidiinae, 
. Front wings w. 3 cubit. cells 4. 
Front wings w. 2 cub. cells or less. 
Stigma very long a. narrow, lanceol.; marg. cell acutely pointed at apex, 
the submed. cell shorter than the med.; h.-cox. very long a. slender; 
abd. inserted high up on the metathor. Subfam. II. Paxylomminae. 
Stigma large, broad, oblong, or subovate; marg. cell most freq. very short, 
sometimes abs., the submed. cell as long or longer than the med.; h.- 
cox. norm.; abd. inserted normally. Subfam. III. Euphorinae. 
. Stigm. large, broad, subtriang.; 2nd cub. cell wider than long or subquadr.; 
meson. furrows, as a rule, shallow, not deeply or sharply impress., a. conv. 
a. meet. in a depress. before attaining the base of the scutell.; tib.-spurs 
distinet, but not especially long. Subfam. IV. Meteorinae. 
.. Fr.-wings w. 2 cub. cells 6. 
Fr.-wings w. 3 cub. c.; anal c. most frequently divided by a transv. nerv. or 
stump of a nerv. 
Head small, transv., the temples narrow or flat; abd. elong. a. slender, 
the sides parall. or nearly, or somewhat strongly compress., usually 
long. than the head a. thor. united; tib.-spurs not short, long or very 
long Subfam. V. Macrocentrinae. 
Head usually large, quadr. or subquadr., the templ. broad: abd. rarely 
much long. than the head a. thor. united, most freq. shorter, ovate or 
oval; tib.-spurs short, stout. Subf. VI. Helconinae. 
. Meson., exc. in Centistes Halid., w. sharply defined paraps. furr., the furr. 
usually punct. a. conv. a. unit. at or before attaining the base scutell.; tib. 
spurs either well develop. or short; h.-cox. large, much larg. than the anter. 
a. middle pairs Subf. VII. Blacinae. 
. Fr.-wings w. 2 cub. cells Subfam. VIIL Sigalphinae. 
Fr.-wings w. 3 cub. cells Subfam. IX. Cheloninae. 
. H.-wings most freg. w. 2 marg. cells a. oft. w. a discoid. cell; if w. only 
1 marg. c., the marg. c. in the fr.-wings is wanting or incompl., or at most 
feebly indicated; meson. w. or without furr.; subdisc. n. in h.-w. never pres., 
the med. c. usually more or less contract. at the middle 10. 
H.-wings w. only 1 marg. cell, the rad. most freqg. wanting; mesonot. furr. 
usually compl.; marg. c. in fr.-wings always pres. 
