Hymenoptera. 21 



Fore wings without a stigma, the marginal vein if present, linear, not stigmated; 

 costal vein entirely absent or much thinner than the subcostal (PI. 3, figs. 

 44, 46); abdomen with the ventral segments hard and chitinous, without 

 a median fold; antennie with not more than sixteen joints (in our genera); 

 wings with very incomplete venation 22 



15. Costal and subcostal veins separated, enclosing a narrow costal cell (PI. 3, fig. 



38) 16 



Costal and subcostal veins confluent, no costal cell (PL 3, fig. 42) 18 



16. Abdomen inserted on the thorax far above the hind cox*; antennae with thir- / 



teen or fourteen joints. (Foenus, Evania, Pristaulacus) (PI. 3, figs. 38, 43). k 



EVANilD^ 

 Abdomen inserted normally, low down and quite close to the hind coxte. . .17 



17. Antennse fourteen- join ted; body of the abdomen beyond the petiole compressed, 



ovate or rounded; ovipositor short. (Ropronia.) ROPRONHDiE 



Antennse very slender, with thirty joints or more; abdomen elongate; ovipositor 

 long. (Stephanus.) STEPHANIDiE 



18. Mandibles abnormal, their attachment reversed so that the cutting edges face 



outward, laterally instead of inward, and so do not meet when the jaws are 



closed. (Dacnusa, Aphaereta, Alysia.) ALYSIID^ 



Mandibles normal, their tips meeting when closed 19 



19. Ventral abdominal segments soft and membranous, with a median fold 20 



Ventral abdominal segments hard, chitinous, without a median fold; second and 



third segments covering most of the abdomen. (Myersia, Thaumatot3rpidea.) 



MYERSIID^ 



20. Front wings with two recurrent nervures (except in the rare genus Pharsalia) ; 



none of the dorsal abdominal segments fused together, all freely movable. 

 (Ichneumon, Cryptus, Limnerium, Ophion, Tryphon, Pimpla) (PI. 3, fig. 42; / 



PI. 4, fig. 63; PI. 5, fig. 85) ICHNEUMONIDiE ^ 



Front wings with only one recurrent nervure (PI. 3, fig. 40); second and third 

 segments of abdomen usually immovably united 21 



21. Abdomen inserted on the thorax high above the hind cox«; rare insects. (Cap- 



it6nius (= Cenocoelivs).) CAPITONIIDiE 



Abdomen inserted close to the hind coxfe; a very exteasive group. (Lysiphlebus, 

 Meteorus, Chelonus, Microgaster, Bracon, Rhogas) (PI. 3, fig. 40; PI. 4, 

 fig- 76) BRACONIDiE 



22. Sides of the pronotum extending back to the tegula?; antenna^ not elbowed. 



Gall Flies. (CYNIPOIDEA.) 23 



Pronotum not extending back to the tegulse (PI. 4, fig. 73) ; antenna? more or 

 less distinctly elbowed. Chalcis Flies (CHALCIDOJDEA.) 30 



23. Dorsal abdominal plates meeting along the venter, and entirely enclosing all 



the ventral plates, except sometimes a part of the hypopygium. (Eucoila, 



AUotria.) FIGITIDiE 



Dorsal abdominal plates usually extending well down on the sides of the abdo- 

 men, but not meeting along the venter; all or nearly all of the ventral plates 

 visible 24 



/ 



