PTEROMALIDAE OF N.W. EUROPE 321 



general surface, with hairs extending the whole length of their dorsal surface ; spur of mid 

 tibia more than three quarters the length of the first tarsal segment. Fore wing about twice 

 as long as broad ; costal cell not very broad (length : breadth about 10 : 1), its lower surface 

 with two irregular rows, sometimes three rows in the distal part, of hairs, its upper surface bare 

 except for a row of hairs extending over the distal half of the cell or rather less ; basal cell 

 hairy over rather less than its distal half ; speculum open below, on the upper surface of the 

 wing moderate-sized but not extending farther than the base of the marginal vein ; wing 

 beyond the speculum thickly hairy ; marginal vein only very slightly longer than the post- 

 marginal vein, but 1-7 to 2 times as long as the stigmal vein ; the latter slightly curved with a 

 small, subcircular stigma which has a long uncus (Text-fig. 251). 



Gastral petiole strongly transverse. Gaster lanceolate or ovate-lanceolate, if the ovipositor 

 sheaths are included slightly to distinctly longer than head plus thorax, slightly narrower 

 than the thorax, 2-5 to 3 times as long as broad, excluding the ovipositor sheaths, which are 

 slightly exserted, acute apically ; the basal tergite occupies about one quarter or slightly more 

 of the total length, and has a subtriangular basal fovea ; ventrally the gaster is keeled, the tip 

 of the hypopygium situated somewhat before the middle. 



cJ. Differs from the female as follows : 



Antennal scape (Text-fig. 245) shorter, its length distinctly less than the transverse diameter 

 of an eye, and broader, only about 3-5 times as long as broad ; pedicellus only about 1-5 times 

 as long as broad ; combined length of pedicellus and flagellum only slightly less than the breadth 

 of the head ; pedicellus slightly shorter, 1 -z to 1 -5 times as long as the first funicular segment ; 

 funicle stout, proximally slightly stouter than the pedicellus, hardly thicker distally, its first 

 segment quadrate, or hardly longer than broad, the following segments very slightly transverse ; 

 clava hardly broader than the funicle, very short (1-5 to 1-7 times as long as broad), very 

 slightly longer than the two preceding funicular segments together ; flagellum clothed with 

 quite strongly outstanding hairs whose length is slightly less than the breadth of the segments 

 which bear them. 



Gaster compressed, nearly as long as but much narrower than the thorax. 



The female of venustus differs from those of citripes (Thomson) and lativentris 

 sp. n. in the darker colour of its antennae and legs (see key to species). It also 

 differs from that of citripes in having the combined length of the pedicellus and 

 flagellum somewhat less than the breadth of the head ; first funicular segment 

 hardly more than half as long as the pedicellus, about two thirds as long in citripes ; 

 clava a little longer. It also differs from the female of lativentris sp. n. in its much 

 longer, compressed and lanceolate or sublanceolate gaster, which has a relatively 

 shorter hypopygium ; shorter propodeum ; and other small details, for which see the 

 respective descriptions. 



Holotype $. England : Oxfordshire, near Stanton St. John, i.viii.1954, on 

 Pastinaca sativa L. (Graham), in Hope Department, University Museum, Oxford. 



Paratypes. Same data as holotype, 5^, 4 $ ; Berkshire, Wytham, 3 $, 29.viii.1954 

 on Umbelliferae (G. R. Gradwell) ; Buckinghamshire, Hell Coppice, near Oakley, <$£ 

 $$, 26.vii.1953, captured on flowers of Pastinaca sativa L., $$, 2.viii.i953, swept from 

 grasses (Graham), in Graham and Gradwell collections. 



Biology. Unknown. 



Species sola 

 Gastrancistrus aequus sp. n. 



§. Head and thorax green to blue-green ; gaster bright green at the base, otherwise greenish 



