20 Orthorrhapha brachycera. 



Geographical distribution: — Europe down into France; towards 

 the north to northern Finland but here rare. 



2, D. oelandica L. 



1761. Linn. Fn. suec. 1916 (Asilus) — 1842. Zett. Dipt. Scand. I, 

 182, 1 et 1849. VIII, 2972, 1. — 1847. Low, Linn. Entom. Il, 410, 1. 

 — 1862. Schin. F. A. 1, 121. — 1903. Kat. palaarkt. Dipt. II, 106. 



Male. Face with brassy yellow pruinosity, the middle line and 

 the part below the antennæ black; antennal tubercle of middle size, 

 it and the vertex black; epistomal beard yellow; jowls, proboscis and 

 palpi black ; proboscis with yellow hairs on the apical part, palpi with 

 black hairs. Occiput black with black bristles, along the hinder eye- 

 margin, especially below, greyish yellow pruinose, which is only seen 

 in certain directions. Antennæ black, the two first joints with black 

 hairs; the first joint about twice as long as the second, the third 

 slightly shorter than the two first together. Thorax black, shining; 

 the disc wilh two faint, narrow, distant stripes of a greyish brown 

 pruinosity; otherwise the disc clothed with short, blackish hairs; the 

 præsutural bristles black or brown, the supraalar brislles black. The 

 hairy stripes on the pieura distinct, dark yellow to greyish yellow; 

 there are some longer yellow hairs above the front coxæ and some 

 darker ones at the hind margin of the mesopleura; the metapleura 

 have long, yellow bristles. Abdomen black, shining; venter black, 

 only the genitalia are partly ferrugineous beneath. Abdomen is spar- 

 ingly clothed with short, blackish pubescence; at the lateral margins 

 of the first segment there are longer, yellow hairs. Venter with longer 

 hairs ; the genitalia have somewhat long, ferrugineous hairs. Legs red- 

 dish yellow, the coxæ black, the hind trochanters generally brownish 

 to blackish ; all tibiæ brownish black towards the tips and the hind 

 metatarsi likewise brownish black; the hind tibiæ are somewhat thick- 

 ened at the apex, the hind metatarsi not thickened. The coxæ are 

 greyish pruinose on the outer side and clothed with long, greyish 

 hairs, for the rest the legs are short yellow pubescent; the fringe on 

 the hind femora is whitish brown, that on the tibiæ pale brown ; the 

 long, thin hairs on the ventral side of the femora and hind tibiæ are 

 whitish or yellowish. The strong, spine-like bristles on the legs are 

 yellow to light brownish. Wings strongly brownish black fumigated, 

 most at the basal part and along the anterior margin; often a clearer 

 middle part in the posterior cells. Veins dark brown. The surface 

 of the wing with a bluish violet reflex. Balteres yellowish to light 

 brownish. 



