360 M. W. R. de V. GRAHAM 



Gaster varying from almost circular to sublanceolate 



DIBRACHYS Forster (p. 804) 



- Vertex not separated from the occipital surface by a carina ... 36 



36 (35) Gaster usually ovate and distinctly pointed or acute apically ; if sub- 



circular and hardly pointed, then slightly longer than the thorax 



TRITNEPTIS Girault (p. 801) 



- Gaster broad and circular, obtuse apically, at least slightly shorter than the 



thorax CYCLOGASTRELLA Bukovskij (p. 796) 



37 (34) First funicular segment of antenna (Text-figs. 651, 652) long and slightly 



constricted in its proximal half, much longer than any of the other seg- 

 ments. Propodeum with plicae complete or nearly so, costula sometimes 

 indicated. Gaster ovate, pointed apically. Fore wing with only moder- 

 ately dense pilosity below the marginal vein ARTHROLYTUS Thomson (p. 789) 

 First funicular segment of antenna (Text-fig. 656) short, subquadrate, 

 subequal in length to each of the following segments. Propodeum (Text- 

 fig. 657) without plicae or costula. Gaster subcircular. Fore wing (Text- 

 fig. 296) with very dense pilosity below the marginal vein 



ERDOESINA Graham (p. 796) 



38 (24) Antennae inserted below the level of the ventral edge of the eyes ; head 



protuberant at level of antennal toruli, the face receding strongly relative 

 to the frons ; postmarginal vein of fore wing only slightly longer than the 

 stigmal vein ; gaster subcircular. . . . . . . .27 



If the antennae are inserted below the level of the ventral edge of the eyes 

 and at the same time the front of the head is protuberant, then the post- 

 marginal vein of the fore wing is much longer than the stigmal vein . . 39 



39 (38) Gaster with a pale transverse band near the base ; basal cell of fore wing 



pilose over at least its distal half ; pronotal collar rounded off in front ; 

 mesoscutum with numerous shallow but distinct piliferous punctures 

 visible amongst the reticulation ; hind corners of propodeum appearing 

 sharp in dorsal view ; hind tibiae with two apical spurs 



DIMACHUS Thomson (p. 823) 



- Not having the above combination of characters ..... 40 

 4° (39) Clypeus shiny, its anterior margin with a median tooth or angulation ; two 



bristles of each gastral pygostyle much longer than the others ; meso- 

 scutal notauli usually traceable to hind margin, though very superficial 

 posteriorly ; pronotal collar rounded off in front ; marginal vein of 

 fore wing tending to be somewhat thickened towards the base 



HEMITRICHUS Thomson (p. 826) 



- Anterior margin of clypeus rarely with a median tooth or angulation, if so 



then the bristles of the gastral pygostyles are subequal in length and 

 relatively shorter, the notauli are incomplete, the pronotal collar is some- 

 times margined, whilst the marginal vein of the fore wing is not obviously 

 thickened ........... 41 



41 (40) Mesoscutal notauli complete and sharply impressed throughout. Hind cor- 

 ners of propodeum as seen in dorsal view sharp, rectangular or acute, the 

 propodeal callus slightly ridged longitudinally. Gaster alutaceous all 

 over. Pronotal collar rounded off in front. Marginal vein of fore wing 

 about 2-5 times as long as the stigmal vein 



DORCATOMOPHAGA Kryger (p. 828) 



- Notauli almost always incomplete and reaching at most somewhat more than 



half way across the mesoscutum ; very rarely traceable to its hind margin 

 but then very superficial posteriorly, and the other characters not all 

 agreeing with the above ......... 42 



