PTEROMALIDAE OF N.W. EUROPE 301 



very strongly convex in the transverse axis, sculptured like the mesoscutum but rather more 

 finely, except the frenum which on the contrary is more coarsely so, with two to three pairs 

 of bristles which are short for the genus and tend to get broken off ; frenum marked off by an 

 extremely fine line ; the scutello-axillar sutures converge strongly, then curve round anteriorly 

 and meet, so that the scutellum is separated from the mesoscutum by a groove which is strong 

 and more or less sculptured. Axillae sculptured like the scutellum. Dorsellum a raised, slightly 

 reticulate transverse crest, whose length is slightly more than half that of the frenum. Pro- 

 podeum long, medially distinctly more than one third the length of the scutellum, between the 

 spiracles with very fine, but distinctly raised, reticulation, relatively dull ; median carina 

 indicated but irregular ; plicae usually indicated at the hind margin of the sclerite ; at the base 

 of the propodeum, on each side of the median carina, there are two or three foveae ; spiracles 

 suboval, separated by about half their major diameter from the metanotum ; callus with rather 

 weaker sculpture than the rest of the propodeum, very hairy, the hairs extending to the supra- 

 coxal flange, and laterally almost to the edge of the metapleuron. Metapleuron, and meso- 

 pleuron mainly (Text-fig. 207) with fine but strong reticulation which is distinctly raised above 

 the general surface, on the mesopleuron the sculpture becomes obsolescent dorsad below the 

 base of the hind wing ; mesepimeron unusually large, rhomboidal, sculptured like the meta- 

 pleuron. Mesosternum shiny, with fine, delicate alutaceous sculpture which is hardly raised 

 above the surface ; mesolcus strongly impressed. Postspiracular sclerite, and prosternum, 

 strongly though moderately finely reticulate. 



Legs rather short and stout ; hind coxae only about 1-75 times as long as broad, with fine 

 though strong reticulation, rather stronger than that of the mesopleuron, their dorsal surface 

 with hairs extending to the base. Spur of mid tibia about three quarters the length of the first 

 tarsal segment. 



Forewing rather long, about 2-25 times as long as broad, with the costal margin unusually 

 straight : costal cell broad (length : breadth about 8 : 1), its lower surface with scattered hairs, 

 its upper surface bare except for a very short row of two to four hairs at the apex of the cell ; 

 basal cell, on upper surface of wing, bare, though the basal vein is pilose ; speculum partly 

 open below, on the upper surface of the wing moderate-sized, not extending below the marginal 

 vein, on the lower surface somewhat effaced by scattered hairs ; beyond the speculum the wing 

 is rather thickly haired ; marginal vein 1-25 to 1-45 times as long as the postmarginal vein, 

 2-i to 2 -5 times as long as the stigmal vein ; the latter curved, with the stigma rather small, 

 suboval, its uncus rather short. 



Petiole strongly transverse. Gaster oblong-ovate, acute apically, about as long as but slightly 

 narrower than the thorax, 2-1 to 2-5 times as long as broad, sunken on the disc dorsally ; basal 

 tergite with a subtriangular basal fovea ; last tergite broader than long ; tips of ovipositor 

 sheaths just visible in dorsal view ; ventrally the gaster is keeled, with the hypopygium ex- 

 tending about half way along. 



$. Differs from the female as follows : 



Antennal scape broader, about three times as long as broad, and relatively a little shorter ; 

 pedicellus very slightly shorter ; flagellum hardly thickening distad, clothed with bristly hairs 

 which are slightly longer than those of the female, though still very short for a male of this 

 genus ; clava only about twice as long as broad, about equal to two and a half of the preceding 

 funicular segments. 



Gaster oblong, nearly as long as but narrower than the thorax, obtuse apically. 



This species much resembles those of the group of salicis (Nees) to which it is 

 evidently closely related. It differs from them particularly in its weak notauli ; 

 the fine short bristles of the head, mesocutum, axillae, and scutellum, which thus 

 appear subglabrous (these bristles easily become rubbed off) ; and the strongly 

 reticulate and relatively dull mesepimeron and prosternum. 



