56 Orthorrhapha bracliycera. 



Geographical distribution: — Northern and iniddle Europe from 

 the niiddie of Sweden to France. 



0. O. angulata Panz. 



1798. SIratiomys, I'anz. Fn. Germ. LVIII, 19. — 1846. Loew, Linn. 

 Entom. 1, 483, 9. — 1802. Schin. F. A. 1, 19. — 1903. Kat. palaarkt. Dipt. 

 II, 23. — 1842. Stratiomys ruficornis, Zett. Dipt. Scand. 1, 139, 9. 



Male. Hoad large, niuch broader than the thorax. Eye-facets in 

 the upper two tliirds much larger than below, the dividing line sharp; 

 eyes bare, greenish, unicolorous. Face very siightly protruding. black, 

 yellowish haired; epistoma and mouth edge yellowi.sh. Antennæ short, 

 reddish yellow, the two ba.sal joints of abnut equal iength. Thorax 

 i)laci\ish with rather short, yellow or greyish, erect pubescence, and 

 iiesides with depressed, golden pul)e.«cence. Scuteiium black with 

 greenisii hind margin, spines yellow. Abdomen green or yellowish 

 green with a broad, Ijlack, dorsai line; on the second and third seg- 

 ments the l)lack line is generally narrowed towards the hind margin 

 of the segments. Venter green or yellowish green. Abdomen very short 

 and tinely pubescent, only in front on the dorsai side sonie longer hairs 

 are found. Legs yellow. sparingly yellow pubescent. Wings hyaline, 

 anterior veins pale yellow, the cubital vein forked, the tiiird of tiie vcins 

 rising from the discai cell quile rudimenlary. Ilalteres green. 



Female. Face and front yellow, front witii a dark. impressed 

 middle line and a pair of brownish spots above the antennæ and 

 another pair below the ocellar tubercle. lying in slight impressions; the 

 spots may be larger or smaller and more or less distinct : hinder eye- 

 margin yellow, golden haired. Thorax with depressed, golden pube- 

 scence, being very siightly longer beneath. The rest as in the male. 



Length 9,5 — 10,6 mm. 



The larva is brownish with some indistincL darker longitudinal 

 stripes; it is densely eovered with somewhat longish hairs on bolh 

 surfaces, but it is especially characterised by the faet that is has, 

 besides a pair of curved spines on the ventral hind margin of the 

 seventh al)dominal segment, girdles of similar but smaller spines on 

 the ventral hind margins of the flrst six abdominal segments. It has 

 a length of 20 nun. 



This species is distinguished from hydroleon, not only by the 

 markings of the abdomen, but also by the short, yellowisli antennæ; 

 in the male by the large head and in the female by the very small, 

 or quite wanting black spots on the yowls. 



O. angulata is perhaps a litlie more comnion than lujdroleon and 

 occurs in the same localities; vicinity of Copenhagen, Ordrup Mose, 



