Strationij iidae. 3 !• 



tlie side margins of the first and second segments. Venter black vvitli 

 the side margins and the iiind margins of the segments yellow. Legs all 

 yellow. Wings hyaline with yellowish veins and stigma. Halteres yellow. 



Female. Eyes nearly bare with a reddish band about in the 

 middle. Front yellow with a black middle line, vertex black; epistoma 

 and yowls black; the hinder eye-margin yellow. Thorax black with 

 all the sides broadly yellow, in front of the wing-root a black spot 

 and below the wing-root a yellow spot; on the disc two yellow, 

 longitudinal stripes, not reaching the scutellum, in front connected 

 with the yellow sides. Abdomen as in the male but the yellow side 

 margins on the first and second segments distinct and widened to a 

 spot on the second segment. 



Length 3,8—4.3 mm. 



O. fonnosa seems, like the preceding, to be very rare in our country, 

 only about ten specimens are known; neighbourliood of Copenhagen 

 (Schlick). Dyrehaven (Stæger, H. J. Hansen) ; it has heen taken in July. 



Geographical distribution : — North and nn'ddle Europe down to 

 the north of France; its northern limit lies in the south of Sweden. 



7. O. pygmæa Fall. 

 1817. Stratiomys, Fall. Dipt. Suec. Strål. 11, 9. — 1842. Zett. Dipt. 

 Scand. 1, 145, 6. - 1857. Loew, Berl. Ent. Zeitschr. I, 31 . - 1862. Schin. 

 F. A. I, 10. — 1903. Kat. palåarkt. Dipt. II, 14. 



Male. Eyes bare, lower facets smaller than the upper. a reddish 

 l)and on the dividing line. Front more ascending and hence the eye- 

 suture shorter than in O. fonnosa. Frontal triangle and clieeks silver 

 haired, epistoma black. Antennæ black. Thorax black, dullish, with 

 short brownish yellow pubescence, below with whitish pubescence; on 

 the sides a narrow yellow stripe, reaching below the wing-root and 

 farther back, and generally with a small spot farther downwards on 

 the pleura. Scutellum black or with the apex more or less broadly 

 yellow, the spines reddish yellow ; postscutellum black. Abdomen black 

 with yellow or whitish yellow side spots on the third and fourth 

 segment, connected with each other along the side margin and with 

 the yellow hind margin of the fifth segment. Venter black with yellow 

 side margins and three more or less extended yellow middle spots. 

 Femora blackish. yellowish at the bases and tips; front and hind tibiæ 

 blackish, yellowish at the bases, middle tibiæ blackisli in the middle; 

 tarsi blackish, the posterior generally yellowish at the bases. Wings 

 hyaline, the anterior veins yellow, the others white and very indistinct. 

 Stigma yellowish. Halteres yellow. 



Female. Eyes with a band about in the middle. Front yellow, 

 with a black middle line, sometimes somewhat widened a little above 



