Stratiomyiidae. 51 



greenish with a piirplish band on the dividing line. Face somewhat 

 prolruding, black with a yellow middle line, yellovv haired, along the 

 inner eye-margin brownish haired; front more or less distinctly silver- 

 grey haired. Antennæ black, first joint fully twice as long a.s the 

 second. Thorax brownish black with long, yellow pubescence. Scutelluni 

 with very small spines. Abdomen rather broad, blackish, with yellow, 

 transverse side spots on second, third and fourth segments, clothed 

 with dense, depressed, silvershining pubescence, more or less hiding 

 the yellow spots; the margin of the abdomen narrowly yellow and 

 yellow haired. Venter yellow with yellow pube-scence, generally with 

 a pair of small black spots on the middle of the third and fourth 

 segments. Fenjora blackish with yellow tips; tibiæ yellow with more 

 or less distinct black rings in the middle ; tarsi yellowish, brown towards 

 the ends; feinora with long, yellowish hairs, tibiæ short haired. Wings 

 hyaline, anterior veins Jirownish yellow, cubital vein not forked, the 

 third of the veins, rising from the discali cell, wanting. Halteres yellow. 



Female. Eyes with the purplish band situated in the middle. 

 Front black, densely clothed with depressed, golden pubescence; face 

 yellow in the middle, cheeks and yowls black, clothed with long, 

 greyish pubescence; hinder eye-margin with dense, golden pubescence. 

 Thorax densely clothed with short, depressed, golden pubescence. 

 Abdomen black, the hind parts of the segments densely clothed with 

 short, depressed, golden pubescence, thus forming transverse, golden 

 bands. Femora yellow with black rings near the tips; tibiæ yellow, 

 sometimes an indistinct, dark ring on the hind tibiæ. 



Length 7,7 — 9 mm. 



The larva is similar to that of tigrina but it has much longer 

 hairs on both surfaces, and in the side margins of the segments it 

 has distinct brushes of hairs on somewhat protuberance like dilatations. 

 It has a length of about 18 mm. 



This beautifal species is at once distinguished by its whole exterior ; 

 it is recorded to have sometimes traces of a branching of the cubital 

 vein. all the specimens I have seen, have the vein quite unbranched. 



O. arc/eiitafa is very i-are in Denmark, I know only a score of 

 specimens; Ordrup Mose (Jacobsen), Charlottenlund, Ørholm (Schlick); 

 Falster (Shiødte); the species seems to be an early one, the specimens 

 have been taken from the 6tli to the last half of May; the larvæ were 

 taken at Ørholm on ^-/4; they were sifted from flood refuse. — As 

 said the species seems very rare, but Schiødte 1. c. records that Jacobsen 

 observed it on the sixth of May 1843 in Ordrup Mose in great numbers; 

 the females sat on tlowers of Salix, while the males sat on dead 

 rushes, liking silver spots ; he says that while the females were sluggish, 



4* 



