672 M. W. R. de V. GRAHAM 



the proximal ones sometimes very slightly longer than broad, the distal ones occasionally very 

 slightly transverse ; clava rather more than twice as long as broad, nearly as long as the three 

 preceding funicular segments together ; sensilla in one row on each segment, sparse on the 

 funicle, more numerous on the clava. 



Thorax about i-6 times as long as broad. Pronotal collar (Text-fig. 532) moderately long 

 medially, one seventh to one sixth as long as mesoscutum, and much longer at the sides, strongly 

 and coarsely reticulate, very slightly margined in the middle anteriorly. Mesoscutum 1-45 to 

 1 -5 times as broad as long, rather coarsely reticulate discally, more finely laterally, without 

 piliferous punctures. Scutellum virtually as broad as long, moderately convex, finely reticulate, 

 the frenum rather more coarsely. Axillae finely reticulate. Dorsellum a narrow, alutaceous 

 transverse crest which is separated from the scutellum by a longitudinally-costate suture. 

 Propodeum medially slightly less than half as long as the scutellum ; median area 1-5 to 1-65 

 times as broad as long, well-defined laterally, the plicae distinct throughout and sharp over 

 at least their hinder half ; median carina distinct, straight ; panels of median area finely, 

 slightly irregularly reticulate ; nucha transversely aciculate, separated from the median area 

 by an impressed line which has a few longitudinal costulae ; posterior foveae, at sides of nucha, 

 large and deep ; spiracles short-oval, separated by nearly half their length from the metanotum. 

 Postspiracular sclerite narrow, shiny, weakly and irregularly sculptured. Mesepisternum 

 moderately finely reticulate, its upper triangular area very finely reticulate below but smooth 

 above ; mesepimeron rather more coarsely reticulate than the mesepisternum, metapleuron 

 more finely so. Legs rather short ; femora rather stout ; mid tibiae fairly slender, seven to 

 eight times as long as their maximum breadth. Fore wing rather broad ; costal cell fairly 

 broad, its upper surface bare, lower surface with a complete row of hairs and some additional 

 hairs scattered over the distal third to half ; basal cell bare, open below ; basal vein bare or 

 with one to two hairs ; speculum open below, on upper surface of wing extending below the 

 marginal vein for about half the length of the latter ; surface beyond the speculum thickly 

 pilose ; marginal vein 1 -65 to 2 times as long as the stigmal vein ; postmarginal vein slightly 

 shorter than the marginal. 



Gaster ovate, slightly longer than the thorax, as broad as or slightly broader than the thorax, 

 1 -5 to 1 -85 times as long as broad ; basal tergite occupying from slightly more than one quarter, 

 to nearly one third, the total length ; last tergite somewhat shorter than its basal breadth ; 

 ovipositor sheaths projecting at most very slightly ; hypopygium reaching a little beyond the 

 middle of the gaster. 



o*. Not identified with certainty. Some males were taken in company with the females 

 described here, but they may belong to the species mentioned under the name " ? semiclavatus 

 (Ratzeburg) " 



Holotype $. Scotland : West Inverness, Arisaig, 5.vii.i96i, on Salix aurita L. 

 {Graham), in Hope Department, University Museum, Oxford. 



Paratypes. Same locality as holotype, 1 ?, 29.vi.1961 (probably on Salix aurita), 

 1 $, 30.vi.1961, on Betula, 1 $, 5.vii.i96i, on Salix aurita ; Isle of Rhum, Kinloch, 

 1 $, 4.1X.61, on Betula, 2 $, 5.ix.i96i, on Salix aurita, 1 $, 24.vii.1962, on Salix 

 aurita {Graham), in Graham collection. 



The female of longicollis sp. n. is extremely close to that of the species listed above 

 as " ? semiclavatus ", which appears to differ only in having a longer gaster, 

 lanceolate, slightly longer than head plus thorax, 2-3-27 times as long as broad, 

 with the basal tergite relatively shorter than in longicollis and the last tergite about 

 as long as its basal breadth. Exceptionally small females of amaenus (Walker) 

 might be mistaken for longicollis ; however, they have the anterior margin of the 

 clypeus (Text-fig. 526) rather deeply emarginate and with a distinct impression in 



