6 TJ. S. NATIONAL MUSEUM BULLETIN 216 paet 3 



2. Tribe Hemigasterini 



Front wing normally 3.5 to 19 mm. long (the wings sometimes 

 vestigial); apex of clypeus usually truncate, sometimes rounded or 

 concave, sometimes with a median tooth or notch; areolet present or 

 rarely absent; second recurrent vein with one bulla, vertical or sloping 

 inward slightly, so that outer hiad corner of second discoidal cell is 

 a right or obtuse angle and is not longer or sharper than outer front 

 corner; dorsal rim of metanotum always with a small sublateral pro- 

 jecting tooth or angle opposite front end of lateral carina of pro- 

 podeum; propodeum usually areolated, with the lateral longitudinal 

 carina indicated at least basally; one or two transverse propodeal 

 carinae present, the apical transverse carina usually the stronger or 

 more persistent. 



The Hemigasterini is almost worldwide in distribution but the 

 bulk of the group is in the Holarctic region. Many of the species are 

 parasitic in sawfiy cocoons. Polytribax, however, parasitizes Lepid- 

 optera, Cubocephalus parasitizes borers or sawfiy pupae inside stems, 

 and the host relations of many of the genera are unknown. 



The tribes Hemigasterini, Rothneyiini, and Aptesini of previous 

 classifications are here combined for the first time. Of the three 

 former tribal names, Hemigasterini is chosen because it is based on 

 the oldest generic name. 



The genera of Hemigasterini, so far as described, are as follows: 



Apophysius 



Aptesis (= Neleophron, =Pezoporus) 



Cnemocryptus 



Cubocephalus (=Cratocryptus, =Ecporiheior, — Microcryptus, =Pam- 



machus, — Planocryptus, — Stenocryplus) 

 Demopheles {= Mecocryptus) 

 Finchra 

 Giraudia { — Calocryptus, =Colocnema, =^Coelocrypius, =Pseudo- 



cryptus) 

 Hemigaster { = Asius, ^Charmis, =^Chreusa, =Cryptodema) 

 Javra 



Listrocryptus 



Mansa {=CoIganta, = Pseudomansa) 

 Megaplectes (—locryptus) 

 Monocrypius 

 Opidnus 

 Oxytaenia 

 Phyzelus 



Plectocryptus= {Aconias) 



Polytribax {—Chasmocryptus, = Sieriphocryptus) 

 Rhembobius (= Ulothymus, — Acanthocryptus) 

 Rothneyia 

 Schenkia {=^ Ecpaglus, —Schenckia) 



