PTEROMALIDAE OF N.W. EUROPE 393 



39 (36) Antennal formula 11272 or 11281 ; funicular segments very elongate, the 



first segment 3-5 to 5 times, the last segment 1-7 to 2-5 times, as long as 

 broad ............ 40 



- Antennal formula 11263 ; funicular segments usually relatively shorter . 41 



40 (39) Propodeum without plicae ; postspiracular sclerite very small ; head and 



thorax with conspicuous whitish hairs. Antennal formula 11 272 



ISCHYROPTYX Delucchi (p. 433) 



- Propodeum with plicae indicated in at least the basal half ; postspiracular 



sclerite moderate-sized ; head, and thorax excluding propodeum, with 

 very inconspicuous hairs which are not whitish. Antennal formula 11272 

 or 11281 AR THROL YTUS Thomson (p. 789) 



41 (39) Postmarginal vein of fore wing only as long as, sometimes even slightly 



shorter than, the stigmal vein ........ 42 



- Postmarginal vein at least slightly longer than the stigmal vein- . . . 51 



42 (41) Face below antennal toruli, and clypeus, with numerous conspicuous pilifer- 



ous punctures amongst the reticulation. Antennae inserted well above level 

 of ventral edge of eyes . . . ROPTROCERUS Ratzeburg (p. 423) 



Face and clypeus with at most inconspicuous piliferous punctures. Antennae 



most often inserted at or hardly above level of ventral edge of eyes . . 43 



43 (42) Temples (Text-fig. 332) strongly produced backwards, in dorsal view at least 



half as long as eyes, forming acute points. Apical margin of fore wing 

 bare. Antennae with anelli large, only moderately transverse, the second 

 anellus more than half as long as the first funicular segment ; antennae 

 inserted slightly below ventral edge of eyes, head very prominent at level 

 of toruli KRANOPHORUS Graham (p. 819) 



- Temples rarely appearing acutely pointed in dorsal view, if so then they are 



slightly less than half as long as the eyes, whilst the apical margin of the 

 fore wing is at least partly ciliate, the anelli are short and strongly trans- 

 verse, and the head is only slightly prominent at level of toruli . . 44 



44 (43) Vertex behind the ocelli almost flat, the occipital surface descending at almost 



a right angle to it, the edge separating the two surfaces sharp ; gena with a 

 small hollow above the base of the mandible 



DIBRACHOIDES Kurdjumov (p. 814) 

 Vertex behind the ocelli curved in the longitudinal axis, most often not 

 separated from the occipital surface by a sharp edge ; gena most often 

 without a distinct hollow ......... 45 



45 (44) Head compressed antero-posteriorly, in dorsal view 2-25 to 2-4 times as 



broad as long ; thorax somewhat flattened, distinctly broader than high ; 

 scutellum in profile appearing nearly flat, its disc shiny with extremely weak 

 sculpture . . .... PLATNEPTIS BouCek (p. 800) 



Head not compressed, in dorsal view at most about twice as broad as long ; 

 thorax rarely distinctly flattened, the scutellum more convex, with distinct 

 reticulation all over .......... 46 



46 (45) Occiput margined, at least medially. Fore wing, beyond the speculum, 



with normal moderately dense pilosity, and without a broad bare strip 

 below the marginal vein .... DIBRACHYS Forster (p. 804) 

 Occiput usually immarginate ; if with a vague indication of a margin, then 

 the fore wing beyond the speculum is sparsely pilose and there is a broad 

 bare strip below the marginal vein, on upperside of wing ... 47 



47 (46) Costal cell of fore wing narrow, at least ten times as long as broad, its front 



edge straight or slightly concave in the middle TRITNEPTIS Girault (p. 801) 

 Costal cell of fore wing at most about eight times as long as broad, its front 



edge at least slightly curved forwards ....... 48 



