24 Orthorrhapha brachycera. 



femora. Wings hyaline, slightly yellowish with blackish veins. Halteres 

 yellow. 



Female. Resembling the male but the pubescence on the thorax 

 slightly shorter and hence the stripes, especially the two lateral,' gene- 

 rally more distinct; the abdomen somewhat broader. 



Length 11,5— 14,5 mm. 



This species is distinguished especially by the highly prominent 

 antennal tubercle, and the colouring of the legs also distinguishes it 

 from the other Danish species. 



D. rufipes is a common species in Denmark ; Ordrup Mose, Erme- 

 lund. Dyrehaven, Brede, Ørholm, Birkerød, Hillerød, the small wood 

 Tyvekrog, at Boserup near Roskilde and Svenstrup between Roskilde 

 and Ringsted; in Jutland at Silkeborg and Dollerup. My dates are 

 29/._29/g_ It occurs in the herbage and high grass on meadows and 

 fields and generally gregarious. 



Geographical distribution: — Northern and middle Europe down 

 into France; tow^ards the north to middle Scandinavia. 



5. D. hyalipennis Fabr, 



1794. Fabr. Ent. Syst. IV, 388, 54 {Asilus) (nec. auct.) — Dioctria 

 flavipes: 1804. Meig. Klass. eur. Zweifl. Ins. I, 257, 6. — 1842. Zett. Dipt. 

 Scand. I, 183, 3 et 1849. VIII, 2974, 3 et 1855. XII, 4580, 3. - 1847. 

 Low, Linn. Entom. II, 426, 10. — 1862. Schin. F. A. I, 122. — 1903. 

 Kat. palaarkt. Dipt. II, 104. 



Male. Eyes in the living specimens greenish, slightly metallic. 

 Face whitish pruinose, a little more yellowish above; just below the 

 antennæ black; epistomal beard not dense, whitish. Proboscis and 

 palpi black with yellow hairs. Antennal tubercle slightly prominent; 

 frons and vertex black, Occiput black with brow- 

 nish, downwards more yellowish, on the jowls 

 whitish hairs; it is whitish pruinose along the 

 posterior eye-margin when seen in certain direc- 

 tions, the whitish colour disappearing above. 

 Antennæ black, the two first joints with black 

 hairs; the first joint scarcely one and a half times 

 as long as the second, the third as long as the 

 two first together. Thorax black, slightly shining, 

 punctate, with three faint, yellow hairy stripes 

 Fig. 10. Headof Z).%aZi- on the disc, disappearing posteriorly; the disc 

 jjennis. otherwise with short, yellow pubescence; the two 



bare, shining stripes between the hairy stripes somewhat distinct. The 

 præsutural and supraalar bristles brownish or yellow. Pleura black, 



