PTEROMALIDAE OF N.W. EUROPE 299 



sunken ; last tergite slightly transverse ; ovipositor sheaths slightly exserted ; ventrally the 

 gaster is convex and keeled, the hypopygium extending about half way along or slightly less. 



6* Differs from the female as follows : 



Antennal scape black with a metallic tinge, except its base and apex ; femora more or less 

 infuscate, the infuscate parts with a metallic tinge, the fore and mid femora have about their 

 basal half dark, the hind femora are mainly dark ; mid and hind tibiae sometimes with a faint 

 infuscate band before their apices. 



Antennae (Text-fig. 224) with scape shorter, its length only slightly greater than the trans- 

 verse diameter of an eye, and broader, about four times as long as broad, but practically reaching 

 the level of the lower edge of the median ocellus ; combined length of pedicellus and flagellum 

 fully 1 -5 times the breadth of the head ; pedicellus barely 1 -5 times as long as broad, much 

 shorter than the first funicular segment ; flagellum of uniform thickness, not or hardly stouter 

 than the pedicellus ; funicular segments all longer than broad, the first, i-8 to 2-2 times, the 

 sixth 1-3 to 1-7 times, as long as broad ; clava tapering and acutely pointed, not broader than 

 the funicle, about 3-5 times as long as broad, hardly as long as the two preceding funicular 

 segments together ; the funicular segments and the clava are clothed with long and strongly 

 outstanding hairs, which form three whorls on each segment, sometimes four on the first funicular 

 segment, the length of these hairs somewhat greater than the breadth of the segments which 

 bear them. Propodeum somewhat longer. Marginal vein of fore wing slightly shorter relative 

 to the stigmal vein. 



Gaster oblong-sublinear, slightly shorter, and much narrower, than the thorax, subtruncate 

 apically ; basal fovea of the basal tergite Y-shaped. 



The female of oporinus on the whole most resembles that of autumnalis (Walker), from which 

 it differs as follows : 



Average size less, body more slender. Head in dorsal view less transverse, in autumnalis it 

 is 2-4 to 2-5 times as broad as long ; clypeus slightly less transverse, about three times as broad 

 as long in autumnalis and more weakly sculptured ; temples slightly longer, in autumnalis 

 one sixth to one seventh the length of the eyes. Antennae with its funicular segments on the 

 average rather shorter ; clava relatively a little longer, in autumnalis its length barely equals 

 that of funicular segments five plus four plus half of three. Scutellum longer relative to the 

 mesoscutum with fewer bristles (in autumnalis four to six pairs), the lines separating it from the 

 axillae converging more strongly so that the base of the scutellum is less broad. Sculpture of 

 mesoscutum and scutellum less fine ; that of the mesopleuron engraved, in autumnalis very 

 slightly raised above the surface. Upper surface of costal cell of fore wing with fewer hairs, in 

 autumnalis there are two rows, or even a partial third row, in the distal half of the cell ; speculum 

 closed below ; submarginal vein with fewer bristles. Gaster rather longer, in autumnalis, 

 excluding the ovipositor sheaths, not longer than head plus thorax ; basal fovea of basal tergite 

 semicircular instead of triangular of Y-shaped ; the hind margin of the basal tergite is not 

 emarginate medially, in autumnalis it is sometimes slightly so. 



The male resembles that of autumnalis , which differs as follows : 



Antennal scape yellow, or with at most its apex ± infuscate ; femora and tibiae yellow, or 

 at most the hind femora ± infuscate. Clypeus rather more transverse, about 2-5 times as 

 broad as long, with its anterior margin rather less strongly curved. Funicular segments of anten- 

 nae relatively longer, the first 2-2 to 3 times, the sixth 1-5 to 2 times, as long as broad. The 

 lines which separate the scutellum from the axillae converge less strongly, so that the base of the 

 scutellum is broader, about one fifth the breadth of the mesoscutum, whilst the scutellum has 

 four to five pairs of bristles. The fore wing has the speculum open below, or imperfectly closed 

 by one or two widely-spaced hairs ; the submarginal vein has more numerous (17 or more) 

 and rather shorter bristles. 



Holotype $. England : Berkshire, Bagley Wood, 14.x. 1954, found on flowers 



