334 THE STUDY OF INSECTS 



D. The costal cell of the fore wings eliminated by the coalescence of the 

 costal and subcostal veins, except in the case of two or three rare genera. 

 The venter is membranous and has in dried specimens a longitudinal 

 fold. 

 E. The transverse part of vein M 2 of the fore wings wanting, causing the 

 union of cells M, and 1st M 2 (Fig. 583). 

 F. The abdomen not very long and slender and strongly compressed. 



p. 346 BRACONIDiE 



FF. The abdomen very long, slender, and strongly compressed. (The 



genus Pharsalia) p. 347 Ichneumonid^ 



EE. Cells Mi and 1st M 2 separated by the transverse part of vein M 2 



(Fig. 587). p. 347 Ichneumonid^; 



DD. The costal cell of the fore wings present. The venter chitinized. 



E. Abdomen borne on the dorsal surface of the propodeum far above the 



hind coxae Aulacidce and Gasteruptionida * 



EE. Abdomen borne between the hind coxae, or on the end of the pro- 

 podeum slightly above them. 

 F. The transverse part of vein M present and situated close to the 

 stigma. 

 G. Antennae in both sexes of more than fifteen segments; trochanters 



clearly two-segmented Trigonalidce, Stephanidce 



GG. Antennae of thirteen segments in the male and twelve in the fe- 

 male; trochanters one-segmented. 

 H. Pronotum without posterior lobes its lateral extensions reaching 

 the tegulae. 



I. Cell M4 of the fore wings shorter than cell Cu + Cui or absent 



(Mutillinae). p. 356 Mutillid^: 



II. Cell M4 of the fore wings present and longer than cell Cu + 

 Cui (Fig. 607). (Vespinas) p. 364 Vespid^e 



HH. Pronotum with posterior lobes terminating at a distance from 

 the tegulae. (This distance is short in the Ampulicinae.) Go to 



EE, p. 337 for the bees Ampulicida and Some Bees 



FF. The transverse part of vein M situated about two-thirds of the 

 way from the wing base to the end of the costal cell (C + Sci) or 

 wanting. 

 G. Wings not longitudinally plaited in repose. Ovipositor not carried 

 along the mid-dorsal line. 

 H. The pronotum laterally reaching the tegulae. No prepectus 

 present. 



I. Hind metatarsi one-fourth the length of the following segment. 



Large insects; the abdomen of the female filiform and several 

 times the length of the head and thorax together; that of the 

 male long and clavate. p. 348 PeleciniDyE 



II. Hind metatarsi at least as long as the following segment. 



J. Mandibles in a reversed position, their apices directed out- 

 wardly, away from the mouth-opening Vanhomiidce 



JJ. Mandibles in a normal position. 



K. Cells Cu + Cui and Ms of the fore wings fully enclosed 

 and separated from each other by perfect veins. 



HeloridcE and Roproniidce 



KK. Cells Cu + Cui and M 3 partly enclosed by brown lines, 

 or altogether wanting. Claws not pectinate. 

 L. Abdomen sharply margined by a carina along the sides; 

 antennae arising near the clypeus. 



Platygasterida and Scelionidoe 



LL. Abdomen immargined laterally (acute in Telenominae 

 but without a carina). 

 M. Fore wings with a distinct stigma. 



N. A closed, usually very short, marginal cell (2d 

 Ri + R 2 ) present. Antennae of thirteen segments. 

 Abdomen with a short cylindrical petiole, the second 

 segment much longer and larger than the others, 

 p. 348 PrOCTOTRUPIDjE 



* The families in italics are not discussed in the text. 



