AMERICAN DIPTERA. 275 



joint rounded apically, with no sign of an angle. We have 

 only a species described from the State of Washington, V. 

 opaca Will., and the following, which appears to be an Euro- 

 pean representative. 



V. pilosa Zetterstedt. 



cf. Front and face silvery; vertex opake, black, with 2 long black, 

 ocellar bristles ; occiput opake, black. Antennae (Fig. 2) with second 

 joint black, bearing long black bristles above and longer yellowish ones 

 below which extend beyond apex ot third ; third shorter than second, 

 yellow to black at base, more or less silvery. Thorax opake black, 

 or, in places somewhat shining ; more or less brownish pruinose with 

 black pile and long bristles ; the latter can be distinguished among 

 the pile as follows : 2 notopleurals, 1 supraalar, 2 postalars, 1 pre- 

 scutellar, and 1 or 2 numerals. Scutellum concolorous, with black 

 pile and 4 marginal bristles. Pleurae and metanotum hardly grayish 

 tinged ; pteropleura pilose ; humeri and halteres black ; squamae yel- 

 lowish. Abdomen opake, black, with only the lateral angles of seg- 

 ments 1-4 grayish ; fifth equalling fourth ; second the longest ; clothed 

 with long blackish pile, especially lateral margins, but longest on first 

 where it forms quite a distinct lateral tuft. Hypopygium (Figs. 44-45) 

 as long as second segment, more shining, with basal and intermediate 

 lobes broadly visible from above ; the terminal lobe completely divided 

 by a cleft extending to the base ; ventral lobe brownish, not conspicu- 

 ously developed. Legs slender, black, with only the knees yellow, 

 and the basal joints of tarsi brown ; fore femora with at most only a 

 weak tuberosity beneath, which is sometimes hardly discernable ; fore 

 and middle femora posteriorly, and post-femora anteriorly, with a 

 series of yellow hairs, or, those on the latter sometimes appearing 

 black ; post-tibiae with an extensor series of same color hairs ; other- 

 wise the legs have only short pile and inconspicuous series of hairs. 

 Wings (Fig. 163) brownish, with colored stigma. Length, 4.5 mm. ; 

 wings, 4.8 mm. 



9 . Generally cinereous with brownish tinge ; all pile and bristles 

 yellow or whitish. Front parallel, narrower than face, brownish above 

 and silvery at antennae ; ocellar bristles minute. Mesonotum some- 

 what indistinctly tri-vittate with brown ; halteres and humeri yellow, 

 bases of abdominal segments opake-black, which color is more or less 

 diffused apically, sometimes nearly reaching the posterior margins ; 

 lateral tuft on first segment very conspicuous, of long white hairs or 

 bristles; sixth segment somewhat shorter than second. Ovipositor 

 (Fig 46) yellow, with black base. Legs with coxae and femora black, 

 but the apices of latter, tibiae and tarsi yellow ; sometimes the tibiae 

 are broadly infuscate medianly ; all femora with a rather more dis- 

 tinctly developed tuberosity beneath than have the males (Fig. 120). 

 Wings (Fig. 164) more grayish. Length, 3.8 mm. ; wings, 4.8 mm. 



TRANS. AM. ENT. SOC, XXXVI. (35*) DECEMBER, 1910. 



