314 Orthorrhapha biachyceia. 



This species is easily known from lutea by tlie smaller size, the 

 black epistoma, the simple front tarsi and the ordinary rows of hairs 

 on the thoracic disc. Meigen describes the frons as black, and like- 

 wise Frey (Aet. Soc. pro Faun. et Flor. Fenn. 31, 1909, No. 9, 8); all 

 my specimens have a grey frons such as mentioned by Scholtz 

 (Zeitschr. fiir Entom. Breslau, V, 1851, 58). The third antennal joint 

 seems to be able to vary from yellovv to brown. 



T. exilis is not uncommon in Denmark; Charlottenlund, Erme- 

 lund. Dyrehaven, Tisvilde; in Jutland at Frederikshavn; my dates are 

 18/6 — 13/7; it was taken in copula on ^^V?. It occurs in woods on 

 similar piaces as lidea. 



Geographical distribution: — The species is hitherto only kiiovvn 

 from Denmark, Germany and Finland. 



24. T. pectoralis Fall. 



1815. Fall. Dipt. Suec. Empid. 9, 8. — 1822. Meig. Sysl. Beschr. 111, 

 87, 46. — 1842. Zett. Dipt. Scand. 1, 295, 28. — 1862. Scliin. F. A. I, 

 91 (Platypalpus). — 1903. Kat. palåarkt. Dipt. Il, 287. — Tachijdroyniu 

 Mraminipes: 1842. Zett. Dipt. Scand. I, 296, 29. 



Male. Frons and vertex dark grey; epistoma whitish grey, very 

 narrow; palpi white, more than half as long as the black proboscis, 

 but not very broad. Occiput dark grey, with whitish hairs above 

 and below. Antennæ black, the third joint considerably shorter than 

 tho arista. Thorax reddish or reddish yellow, shining, with a broad, 

 black median stripe, abbreviated a little behind the middle; some- 

 times the stripe is narrowed behind, and it may be continued as a 

 narrow stripe to the scutellum. The disc is uniformly clothed with 

 short, yellow hairs; there is one longer dorsocentral bristle behind, 

 and one distinct notopleural bristle, both yellow; no humeral bristle. 

 Scutellum with two dark yellow marginal bristles, and on each side 

 a small bristle. Pleura yellow, slightly greyish pruinose, sternopleura 

 shining, generally, but not always, more or less blackish. Abdomen 

 black, shining, with short, yellow hairs. Venter black. Legs yellow, 

 the last tarsal joint blackish, on the anterior tarsi generally only 

 blackish on the apical part; femora sonietimes a little brownish. The 

 front femora slightly, the middle femora somewhat thickened; the 

 apical spine on the middle tibiæ small. The legs are yellow haired; 

 there are no long bristles on the postero-ventral side of the middle 

 femora, but the spines in the row here long and more bristle-like. 

 Wings yellow. Veins brown ; the united part of the costal and sub- 

 costal vein black, or (var. stramineipes) palc. Balteres pale yellow. 



Female. Similar to the male; abdomen pointed. 



