HYMENOPTERA 913 



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. 916 BRACONiDiE 



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

 expanded at apex. (Thaumatotypidea in Stilpnini). p. 917 ICHNEUMONlDiE 

 CC. Second and third abdominal tergites not connate. 



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



(Cryptinae in part), p. 917 Ichneumonid^e 



DD. Abdomen sessile (Aphidiinae in part), p. 916 Braconid^ 



BE. 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. 927 Chalcidid^ 



CC. Pronotum reaching the tegulse 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 Anteoninas). p. 961 .... 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 



Cynipinae). p. 922 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 sutiu^e. Coxae 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. 921 . Platygasterid^ 



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



seven or eight they have an unsegmented club. p. 921. 



SCELIONIDiE 



HH. Abdomen neither acute nor margined laterally. 



I. Males. 



J. Antennas of ten segments {Myrmecomorphus) . p. 934. 



Embolemid^ 



JJ. Antennae of thirteen segments, p. 936.Mutillid^ 

 JJJ. Antennae of fifteen segments. (Belytinae). p. 921. 



Belytid^e 



II. Females. 



J. Antennae of ten or eleven segments. 

 K. Antennae of eleven segments. (Six genera), p. 921. 



Ceraphronid^ 



KK. Antennas of ten segments. 



L. Antennae inserted close to the mouth. (Several 



genera), p. 921 Ceraphronid^ 



LL. Antennae inserted on a frontal prominence in the 

 middle of the face (Myrmecomorphus). p. 934. 



Embolemid^ 



JJ. Antennae 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. 



