;296 Oithorihapha brachycera. 



white hairs below. Antennæ black, the third joint elongated, about 

 -as long as the arista, but relatively shorter than in maciilipes, and 

 l)roader at the base. Thorax yellowish grey pruinose, but not densely, 

 and somewhat shining, all bristles yellow. Scutellum with two yellow 

 marginal bristles, and a small hair on each side. Pleura grey pruinose; 

 above the middle coxæ a black, polished spot. Abdomen black, 

 shining, with short, but distinct greyish white hairs. Venter black. 

 Legs yellow, the base of the coxæ blackish, and sometimes the 

 posterior coxæ quite black; the front coxæ may be quite or almost 

 quite yellow; the middle femora with a blackish or brownish ring, 

 most distinct above, hind femora with a more or less distinct ring 

 near the apex; sometimes also the front femora more or less blackish 

 or brownish; not rarely the blackish markings are slight to nearly 

 disappearing; tarsi black annulated. Front and middle femora some- 

 what thickened, the latter not much more than the former, and I 

 think scarcely as much as in flavipes and maculipes. The legs are 

 distinctly yellowish or whitish grey haired, and the hairs are a little 

 longish; the front tibiæ have a few small bristles. Wings hyahne. 

 Veins brown or blackish, pale towards the base. Balteres whitish 

 yellow. 



Female. Similar to the male; the black markings on the legs 

 generally more distinct; abdomen pointed. 



Length 2,7—3,5 mm, 



This species may be somewhat difficult to distinguisli ; it resembles 

 both flavipes, maculipes and strigifrons; it is generally distinguished 

 by the more or less blackened coxæ, but this may sometimes be 

 slightly marked; the third joint of the antennæ is longer than in 

 flavipes, but shorter than in maculipes. The distinct hairiness of the 

 legs is generally mentioned in the descriptions, and may also be 

 somewhat characteristic, though I do not think the legs are much longer 

 haired than in the preceding species, but the hairs are more obvious, 

 I think partly on account of the darker colour of the legs. All my 

 specimens have the abdomen without bands. The species certainly 

 must be fulvipes. as it has yellow thoracic bristles, while fascipes 

 according to Strobl (1. c. 122, notata) and Frey (Zeitschr. fiir syst. 

 Hymenopt. und Dipt. 1907, 411) has black bristles. Otherwise the 

 descriptions are somewhat different; Strobl speaks of bands on ab- 

 domen, whJle Frey says it is black, unicoloured, and Strobl ascribes 

 the species a long third antennal joint, Frey a short. My specimens 

 have small palpi, while Strobl speaks of large palpi. I doubt whether 

 the forms of flavipes and maculipes with dark patches on the legs, 

 mentioned by several authors, may not in reality be specimens of 



