150 M. W. R. de V. GRAHAM 



problems will certainly be resolved by critical rearing of the species concerned; 

 students of Diptera (particularly Agromyzidae) can assist materially by preserving 

 any Miscogasterini reared from accurately determined hosts, as indeed Mr. K. A. 

 Spencer and Mr. G. C. D. Griffiths have already done. 



Some species of Miscogasterini described by Delucchi, and mentioned in the text 

 below, are omitted from the keys to species because I have not seen their types or 

 any other material. 



Key to European Genera 



i Pronotal collar not margined ......... 2 



- Pronotal collar at least slightly margined in the middle, sometimes sharply so 



throughout ........... 11 



2 (1) Postmarginal vein of fore wing shorter than, or at most as long as, the marginal 



vein ............. 3 



- Postmarginal vein of fore wing at least slightly longer than the marginal vein 8 



3 (2) Antennae with three anelli and five funicular segments. Maxillary palpi of 



■male with stipites enlarged and the two terminal segments of the palpi 

 coalesced to form a swollen yellow sac . HALTICOPTERINA Erdos (p. 166) 



- Antennae with two anelli and six funicular segments. Maxillary palpi o 



male (except in Halticopteva) unmodified ...... 4 



4 (3) Petiole of gaster either virtually smooth, or else strongly transverse . . 5 



- Petiole of gaster reticulate, at most slightly transverse but usually as long as 



or longer than broad .......... 7 



5 (4) Panels of median area of propodeum shiny, weakly sculptured or smooth . 7 



- Panels of median area of propodeum strongly reticulate, often also with some 



rugosity ........... 



6 (5) Petiole of gaster reticulate, at most about twice as broad as long ; margina 



vein of fore wing 2-5 to 2-8 times as long as the stigmal vein . 



- Petiole of gaster at least partly smooth, about three times as broad as long 



marginal vein of fore wing at most twice as long as the stigmal vein . 



7 (6) Fore wing with postmarginal vein at least slightly shorter than the margina! 



vein, the latter 2 to 3-5 times as long as the stigmal vein. Antennae 

 inserted low on head, the lower edge of toruli level with or slightly below 

 ventral edge of eyes. Male with maxillary palpi modified, their two 

 terminal segments coalesced to form a more or less swollen yellow sac ; 

 stipites often enlarged . . . HALTICOPTERA Spinola (p. 155) 



- Postmarginal vein not shorter than the marginal vein. Either the marginal 



vein is at least slightly less than twice as long as the stigmal vein ; or else 

 the lower edge of the antennal toruli is somewhat above the level of ventral 

 edge of eyes. Male with maxillary palpi not thus modified ... 8 



8 (7) Mesoscutal notauli complete, sharply (and usually deeply) impressed through- 



out ; postmarginal vein of fore wing at least slightly longer than the 

 marginal vein ........... 16 



- Either the notauli are superficial posteriorly (or incomplete) ; or the post- 



marginal vein of the fore wing is not longer than the marginal vein . . 9 



9 (8) Stigma of fore wing rather large, tending to be subcircular (as in Text-fig. 164) 21 



- Stigma of fore wing small ......... 10 



10 (9) Petiole of gaster conspicuous, rectangular, as long as broad, reticulate ; pro- 

 podeum with complete plicae, the area between these shiny and weakly reti- 

 culate or partly smooth ; scutellar frenum indistinctly marked off except 



just at the sides ; small (up to 1-7 mm), species with dark body and 

 extensively infuscate legs .... THINOD YTES Graham (p. 167) 



