HYMENOPTERA 915 



C. Second and third abdominal tergites connate.* 



D. Abdomen sessile, or if petiolate, the petiole not curved, or expanded at 



apex. (A few genera.) p. 919 Braconid^ 



DD. Abdomen with an elongate petiole, which is strongly decurved and 

 expanded at apex. {Thaumatotypidea in Stilpnini.) p. 922 Ichneumonid^e 

 CC. Second and third abdominal tergites not connate. 



D. Abdomen petiolate, the first segment elbowed and enlarged posteriorly 



(Cryptin£e in part), p. 922 ICHNEUMONiDiE 



DD. Abdomen sessile (Aphidiins in part), p. 919 BraconiD/E 



BB. The ventral segments chitinized, convex and without a longitudinal fold. 

 C. Pronotum separated from the tegulae laterally by the interposition of a 

 chitinized sclerite, the prepectus. Antennae elbowed. Hypopygium of the 

 female divided, the ovipositor issuing from anterior to the tip of the ab- 

 domen. (A few genera.) p. 941 Chalcidid^ 



CC. Pronotum reaching the tegulas laterally or the latter altogether ab- 

 sent; no prepectus present. 



D . First abdominal segment not forming a ' ' scale " or " node ' ' between the 

 propodeum and the gaster. Thorax sometimes with sutures largely 

 obliterated. 



E. Fore tarsi chelate. (Females of Anteoninae.) p. 978. . . . Dryinid.^ 

 EE. Fore tarsi normal. 



F. Hypopygium of the female divided, the ovipositor issuing from 

 before the tip of the abdomen, which is more or less strongly com- 

 pressed and with a mid- dorsal keel. Second abdominal tergite the 

 longest. Petiole very short, cylindrical, scarcely visible. Wingless 

 or subapterous forms are usually agamic females. (Mostly 



Cynipinas.) p. 934 Cynipid^ 



FF. Hypopygium of the female not divided, but closely applied to 

 the pygidium, the ovipositor or sting issuing from between the two, 

 at the tip of the abdomen. Abdomen rarely or never strongly com- 

 pressed, without a mid-dorsal ridge. 



G. Mesopleura not divided by a transverse sutiue. Coxse and 

 legs not unusually long. 



H. Abdomen margined laterally, the sides sometimes only acute, 

 but usually with a blade-like carina. 



I. Antennae composed of ten segments, rarely less, but in that 



case without an unsegmented club. p. 933 . Platygasterid^e 



n. Antennae composed of eleven or twelve segments, or if of 



seven or eight they have an unsegmented club. p. 933 



SCELIONID^ 



HH. Abdomen neither acute nor margined laterally. 



I. Males. 



J. Antennae of ten segments (Myrmecomorphus) . p. 951 . . . 



Embolemid^ 



JJ. Antennae of thirteen segments, p. 953 Mutillid/E 



JJJ. Antennas of fifteen segments. (Belytinae.) p. 932.... 



Belytid/e 



II. Females. 



J. Antennas of ten or eleven segments. 



K. Antennas of eleven segments. (Six genera.) p. 932 



CERAPHRONIDyE 



KK. Antennae of ten segments. 



L. Antennae inserted close to the mouth. (Several 



genera.) p. 932 Ceraphronid^ 



LL. Antennae inserted on a frontal prominence in the 



middle of the face {Myrmecomorphus). p. 951 



Embolemid/E 



JJ. Antennas of twelve segments. (See also JJJ.) 



*If the suture is entirely obliterated, the presence of two pairs of spiracles 

 will indicate that the apparent second segment consists really of the second and 

 third. 



