146 Orthorrhapha brachycera. 



1 tliink tlie Tronibidium gets on just when the Leptis leaves its 

 pupa skil). 



Geographical distribution: — Northern and niiddie Europe, from the 

 northernmost Scandinavia to France. 



6. L. tringaria L. 



1761. Muscu, Linn. Fn. Suec. 1789. — 184r?. Zelt. Dipt. Scand. 1, 217^ 

 2. — 1862. Schin. F. A. 1, 174. — 1903. Kat. palaaikt. Dipt. U, 82. 



Front and face yellowish grey, the back of the head grey; cheeks, 

 yowls and the back of the head with long, pale yellowish hairs. 

 Antennæ yellow. greyish at the base, arista brown. Second joint of 

 palpi yellow. Thorax greyish, more or less yellow pruinose, with 

 two, lighter yellow, longitudinal lines, and often a similar coloured 

 narrow line in the niiddle; the humeral and postalar calli yellow;. 

 sterna and pleura grey, pteropleura and metapleuja often more or 

 less yellowish. Scutellum yellow. The thoracic disc with short, some- 

 times yellowish, but generally black hairs, scutellum with longer, black 

 hairs; metapleura with longish, yellow hairs. Abdomen reddish yellow,. 

 from the second segment with smallish, more or less roundish, black 

 middle spots and narrow, longitudinal, marginal spots, the latter 

 generally confluent, forniing a black, marginal line; the last, or the 

 last two segments black; the middle spots may diminish or be quite 

 wanting, and the abdomen is then entirely reddish yellow, only with 

 small marginal spots and more or less black apex (var. vaneUtis). 

 The abdomen is clothed with Wack hairs. Legs yellow; tarsi brown, 

 blackish brown towards the ends; sometimes the hind tibiæ brown 

 at the apex. The coxæ, especially the anterior, with long, pale hairs,. 

 for the rest the legs are short haired ; the tibiæ finely spinulous. 

 Wings yellowish, at the base and Ihe anterior margin yellow, veins 

 brown : no stigma. Halteres yellow. 



Female. Front yellowish. Thorax generally more yellowish than 

 in the male, and the yellow stripes often broader, then thorax may 

 be termed yellowish with three broad, dark lines, the middle one 

 sometimes divided by a narrow, yellow line. 



Length. This species, as scolopucea, may vary considerably in 

 size, the length being 8,5 — 14 mm. 



This species, as seen in the description, may vary somewhat in 

 colour, but yet it is casily distinguished from all the preceding by 

 the almost total absence of a stigma, and from the following by the 

 colouring. 



L. trinyaria occurs very commonly all over Denmark. It is 

 especially found in woods where it is seen sitting on stems, often ia 



