HYMENOPTERA 909 



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

 chanters clearly two-segmented. 

 H. Two or three closed submarginal cells in the forewings. p. 929 



Trigonalid^ 



HH. Only one closed submarginal cell in the forewings. p. 919 



Stephanid^ 



GG. Antennas of thirteen segments in the male and twelve in the 

 female; trochanters one-segmented. 



H. Pronotum without posterior lobes (see Fig. 1195) its lateral 

 extensions reaching the tegulse. 



I. Cell M4 of the forewings shorter than cell Cu + Cui or 

 absent (Mutillins). p. 953 Mutillid^ 



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

 Cui (Fig. 1 182). (Vespince.) p. 965 Vespid^ 



HH. Pronotum with posterior lobes terminating at a distance 

 from the tegute (Fig. 1195). (This distance is short in the 

 Ampulicinae.) 



I. Abdomen of male with only six exposed segments, the 

 fourth and following scarcely exposed; that of the female 

 with compressed apex. Prothorax elongate, usually with a 

 median longitudinal groove. Nude insects, often brilliantly 

 metalhc. (Ampulicinae.) p. 978 Ampulicid^ 



II. Abdomen of male with seven exposed segments; that of 

 the female not compressed at apex. Prothorax short with- 

 out median longitudinal groove. Usually hairy insects, 

 some of the hairs plumose. (A few genera in the various 

 families of bees. Pass to EE on page 914.) 



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 shorter and clavate. p. 932 .... Pelecinid^ 



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

 J. Mandibles in a reversed position, their apices directed 



outwardly, away from the mouth-opening, p. 93 1 



Vanhorniid^ 



JJ. Mandibles in a normal position. 



K. Cells Cu + Cui and M3 of the forewings fully en- 

 closed and separated from each other by perfect veins. 

 L. Cell M4 of the forewings triangular; antennas com- 

 posed of sixteen segments, p. 931 HeloriDjE 



LL. Cell M4 of the forewings irregularly six-sided; 

 antennas composed of fourteen segments, p. 931 ... . 



ROPRONIID^ 



KK. Cells Cu + Cui and M3 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. 

 M. Antenna of never more than ten segments, 

 rarely with only eight or nine. Front wings with- 

 out vein C or "stigmal" vein (Sc2 -f Ri), often 

 without any venation, p. 933. . . . PlatygasteriDyE 

 MM. Antennae usually of twelve segments, more 

 rarely of eleven segments, or if of seven or eight 



segments the club is unsegmented. p. 933 



Scelionid^ 



