270 Orthorrhapha brachycera. 



Length 2,5 — 3 mm. 



This species greatly resembles arrogmis at first sight, but it is 

 easily recognised by the absence of the grey spot above the front 

 coxæ, by the bristles on thorax and the radial vein lying nearer to 

 the costa, further by the want of the short spines below the anterior 

 femora but instead with longer hairs, and in the male by the tooth 

 at the apex of the middle tibiæ. 



T.annulimana is rarer in Denmark than arrogans; at Lersøen, 

 Sorø, Tisvilde, Frederikssund and in Nordskoven at Jægerspris; in 

 Jutland at Sminge near Silkeborg and at Bangsbo near Frederikshavn, 

 and fmally on Bornholm at Allinge; my dates are ^^k — ^^h. It occurs 

 in the same way as arrogans. 



Geographical distribution : — Europe down into Italy ; towards 

 the north to northern Sweden, and in Finland. 



3. T. sabulosa Meig. 



1830. Meig. Syst. Beschr. VI, 342, 56 (Tachydromia) , et 1838. VII, 

 95, 12 {Tachypeza). — 1860. Loew, Zeitschr. fur Entom. Breslau, XIV, 

 17, 2. — 1862. Schin. F. A. I, 93 {Tachydromia). — Tachypeza fene- 

 strata: 1842. Zett. Dipt. Scand. I, 318, 7. 



Male. Vertex and frons black, shining; palpi with whitish yellow 

 hairs and a black bristle at the apex. Occiput grej'ish pruinose above, 

 black, shining downwards ; it has black bristles above, whitish bristles 

 downwards. Antennæ brownish with the base yellow. Thorax greyish 

 pruinose, it has distinct, but short, black dorsocentral bristles. There 

 are about three humeral bristles, a stronger and a pair of weaker 

 notopleural and a postalar bristle, all black. Scutellum with four 

 black marginal bristles. Pleura black, shining; the propleural parts 

 whitish grey pruinose, thus there is a whitish grey, triangular spot 

 above the front coxæ; also the hypopleura grey pruinose. Abdomen 

 greyish pruinose, with short hairs. Venter blackish, with a little 

 longer, dark hairs. Legs blackish ; front coxæ yellowish, greyish pruinose 

 on the anterior side; the anterior femora yellowish at the base and 

 more broadly at the apex; the anterior tibiæ yellowish on the basal 

 part; hind femora a little yellowish at the apex, and the tibiæ at the 

 base. Sometimes the anterior femora are more broadly yellowish at 

 base and apex, the black colour then forming a broad ring in the 

 middle. The black parts of the legs are slightly pruinose. Front 

 femora much thickened in such a way, that there is a large swelling 

 in the middle on the postero-ventral side; the middle femora some- 

 what thickened; the middle tibiæ curved a little inwards at the apex. 

 The legs are short-haired, the anterior femora have the ordinary 



