SCENOPINUS 601 



margins, and a similar but narrower band occurs on the sixth segment and a 

 less conspicuous whitish band on the third segment. Genitalia forming a knob 

 which is less than half the width of the seventh abdominal segment ; the pair 

 of brown upper plates are much smaller than in S.fenestralis and have an 

 inconspicuous brown fringe on their straight hindmargins ; the two lower 

 plates are large and almost overlap behind on the lower part, but leave above 

 an almost quadrate open space which is microscopically fringed, and in the 

 middle of which three tiny pale thread-like processes can sometimes be traced, 

 and of them the two side processes are longer than the whitish middle one. 

 Belly blackish. 



Legs blackish, knees very faintly ferruginous, and all the tarsi reddish 

 orange on the three basal joints except at their tips ; front femora stout, 

 and the hind femora flattened ; hind tibiae very much dilated and flattened, 

 club-shaped. Pubescence very slight and inconspicuous, but a little pale 

 pubescence occurs behind the anterior femora, and the hind tibi^ bear 

 behind a sparse delicate fringe of longish pale hairs on rather more than the 

 basal half. 



Wings decidedly blackish brown ; veins (except the subcostal) distinct 

 though not coarse, but in other respects similar to those of S. fenestralis ; 

 upper branch of the cubital fork undulated, barely half as long as the straight 

 lower branch, and ending long before mid-way between the radial vein 

 and the lower branch. Squamse (alar) blackish brown with a brownish 

 black margin and with a slight pale fringe. Halteres blackish, but with the 

 top of the knob dark brown. 



$ . Very similar to the male. Frons shining black, sparsely punctate on the 

 upper part (except at the sides) but not striate near the lower ocellus, and 

 rather wrinkled transversely on the lower half ; a large conspicuous rather 

 shallow almost circular depression occurs about the middle ; sides parallel on 

 about the upper half but afterwards gradually widening down to the antennae, 

 though even there the frons is barely one and a half times as wide as at 

 the vertex ; a minute furrow runs down to the lower end of the depression, 

 and a polished channelled eyemargin exists on the upper two-thirds of each 

 side ; collar at back of upper part of eyes rather narrow, fairly equal, greyish 

 black. 



Thorax black, but somewhat obscured by minute dark bristles and trans- 

 verse striae on all the disc except on the middle part ; humeri not at all chest- 

 nut, and the postalar calli only on the front knob. Scutellum roughened. 



Abdomen shining black, but not at all brilliant ; hind angles of the basal 

 segment with some rather long though inconspicuous greyish yellow 

 pubescence, and the hinder half of the second segment with more extended 

 though shorter more greyish pubescence ; pubescence on the rest of the 

 abdomen blackish grey, fairly abundant, and short, though longer and 

 more conspicuous than in S.fenestralis. 



Legs colored as in the male, or often with only just the base of the 

 anterior tarsi and the three basal joints of the hind tarsi conspicuously 

 brownish orange except at their tips ; front femora only slightly thickened, 

 and the posterior femora elongate but hardly thickened ; hind tibise shorter 

 than the femora, straight, and not at all dilated, but with the usual delicate 

 sparse pale fringe behind ; pubescence very slight, pale behind the middle 

 femora. Pulvilli blackish ; claws black. 



Wings very nigrescent, especially on the front half ; upper branch of the 

 cubital fork usually rather undulating and ending in the costa about half-way 

 between the radial vein and the lower branch. Squamae (alar) small, dark 

 greyish with a distinct dark margin and slight light grey fringe. Halteres 

 blackish brown, with a shining blackish tip. 

 Length about A\ mm. cJ , 5 mm. ? . 



This species varies a little in the amount of reddish orange or reddish 

 brown on the tarsi and knees, but never in a way at all approximating to 

 S. fenestralis. A female taken by Dr D. Sharp in the New Forest in 

 June, 1902, has the portion of the upper branch of the postical vein which 



