PTEROMALIDAE OF N.W. EUROPE 151 



Either the gastral petiole is inconspicuous, transverse, and weakly and 

 irregularly sculptured ; or the propodeal plicae are at most partly developed, 

 and the median area is strongly reticulate and dull. Scutellar frenum 

 distinctly marked off. Species usually larger and with more brightly 

 metallic body and paler legs . . . . . . . . 11 



11 (10) Petiole of gaster inconspicuous, smooth or nearly so, subconical, at least 



slightly transverse. Pronotal collar at most weakly and irregularly 



margined RHICNOCOELIA Graham (p. 168) 



Petiole of gaster conspicuous, strongly reticulate, usually as long as or longer 



than broad, if transverse then nearly rectangular . . . . . 12 



12 (11) Fore wing (Text-fig. 146) entirely pilose except for the speculum which is 



reduced to a small area below the parastigma . . ARDILEA Graham (p. 179) 



Fore wing with a large speculum which extends down to the cubital vein ; 



basal cell at least mainly bare . . . . . . . . 13 



13 (12) Postspiracular sclerite with an oblique carina, which cuts off a smooth or 



weakly and irregularly sculptured upper triangle. Antennal clava of 

 female with a long strip of micropilosity extending nearly to the base 



MERISM US Walker (p. 171) 

 Postspiracular sclerite uniformly reticulate, without an oblique carina. 

 Antennal clava of female with a small area of micropilosity on the third 

 segment only ........... 14 



14 (13) Panels of median area of propodeum strongly reticulate. Anterior margin of 



clypeus with three asymmetric teeth (see Text-fig. 44). Left mandible with 

 three teeth, right mandible with four . CALLIMERISMUS Graham (p. 176) 

 Panels of median area of propodeum weakly sculptured or smooth, shiny. 

 Anterior margin of clypeus with two teeth, the left one occasionally a 

 little larger than the other or (Text-fig. 43) weakly notched. Both man- 

 dibles with four teeth [this needs confirming in Schimitschekia] . . 15 



15 (14) Pronotal collar weakly margined. Female antenna with at most the distal 



segments of the funicle slightly transverse. Male with maxillary palpi 

 modified, the two terminal segments coalesced to form a swollen yellow 



sac ; stipites enlarged HALTICOPTERA (part) (p. 155) 



Pronotal collar sharply margined. Female antenna with all the segments of 



the funicle transverse. Male unknown. SCHIMITSCHEKIA Boucek (p. 166) 



16 (8) Antennae (Text-fig. 132) 11353, with three strongly transverse anelli. An- 



terior margin of clypeus (Text-fig. 131) with three rounded lobes. Fore 

 wing, Text-fig. 133 ... TRICYLOMISCHUS Graham (p. 167) 



Antennae 11 263, rarely the first funicular segment is smaller than the following 

 one, but in that case it is at least as long as broad and is provided with 

 sensilla . . . . . . . . . . . .17 



17 (16) Anterior margin of clypeus with a median tooth or tubercle only . . . 18 

 - Anterior margin of clypeus with two or three teeth (Text-figs. 128, 170) or 



(rarely) with three small lobes or tubercles (Text-fig. 127) ... 19 



18 (17) Scutellum, not counting the axillulae, subquadrangular with sides nearly 



parallel, almost flat. Anterior margin of clypeus subtruncate with a 

 median tooth (Central Europe, Algeria) . . KSENOPLATA Boucek (p. 180) 



Scutellum not subquadrangular, its sides converging forwards, convex. 

 Anterior margin of clypeus slightly curved forwards, with a median 

 tubercle ............ 31 



19 (17) Antennal formula 11272, the first claval segment separated from the others by 



a short peduncle or very deep constriction, and thus appearing like a 

 funicular segment. Petiole of gaster distinctly sculptured, with a sharp 



