320 ELEMENTARY ENTOMOLOGY 



C. Fore-wings with few or no cross veins ; if a few cross veins are 

 present, the abdomen is not compressed. Very small parasitic 

 Hymenoptera. 



D. Ovipositor issuing before apex of abdomen . CHALCIDIDAE 

 DD. Ovipositor issuing from apex of abdomen. (Page 253) 



PROCTOTRYPIDAE 

 CC. Fore-wings with one or more closed cells. 



D. Fore-wings without a stigma, or costal vein. Gall-flies. (Page 



246) CYNIPIDAE 



DD. Fore-wings with a stigma. 



E. Fore-wing with two recurrent veins . ICHNEUMONIDAE 

 EE. Fore-wing with one recurrent vein . . BRACONIDAE 

 A A. Posterior trochanter consisting of a single segment. 

 B. Fore-wings with no closed submarginal cells. 



C. Abdomen long and slender ; antennae long and filiform. 



PELECINIDAE 



CC. Abdomen short, but little longer than the head and thorax together ; 

 antennae short and elbowed. Cuckoo-flies . . . CHRYSIDIDAE 

 BB. Fore-wings with at least one closed submarginal cell. 



C. First abdominal segment, and sometimes the second, forming a 

 knot, or node, on the upper side of the petiole. Ants. (Page 254) 



Superfamily FORMICINA 

 D. First segment of the abdomen forming the petiole. 



E. Abdomen somewhat constricted between the second and 



third segments ; sting present PONERIDAE 



EE. Abdomen not constricted between the second and third 



segments; sting absent CAMPONOTIDAE 



DD. Petiole consisting of the first and second segments of abdomen ; 



sting present MYRMICIDAE 



CC. Petiole normal, without scales or nodes. 



D. First segment of tarsus of hind-leg cylindrical, and naked, or 



with little hair. 

 E. Wings folded longitudinally when at rest. True wasps. 



(Page 263) Superfamily VESPINA 



F. Antennae clavate or knobbed at tip . . MASARIDAE 

 FF. Antennae filiform or nearly so. 



G. Tibia of second pair of legs with a single terminal 



Spur EUMENIDAE 



GG. Tibia of second pair of legs with two terminal 

 spurs. Tarsal claws simple. (Page 264) 



VESPIDAE 



EE. Wings not folded longitudinally when at rest. Digger- 

 wasps. (Page 260) Superfamily SPHECINA 



F. Sides of the pronotum extending back to the base of 

 the wings. 



