Stiatiomyiidae. 67 



branch of the postical vein; betvveen tbe discai cell and tlie postical 

 vein is a postical cross-vein. In rest the wings lie parallel over the 

 abdomen. 



The larvæ quite resemble those of Chloromijia and Sargus; the 

 last segment is rounded behind, only with a very inconspicuous inci- 

 sion; the head is conical with soniewhat buibous swellings at the base, 

 it and prothorax bear several bristles; the other segments bear bristles 

 as in Sargus and Chloromyia. — The larvæ live in dung, in decaying 

 vegetable matter and in the earth ; they hibernate and the development 

 takes place in summer. 



The species of Microchrijsa occur in the same localities as those 

 of Chloromyia, and they are, like these, rather lively. 



The genus only comprises two palæarctic species wliich both occur 

 in Denmark. 



Table of Species. 



I . Antennæ blackish ; thorax without any yellow stripe ou 



the sides 1. polita. 



— Antennæ yellowish or brownisli with the basal joints 

 yellowish ; thorax with a narrow yellow stripe on the 

 sides 2. flavicornis. 



1. M. polita L. 



1761. Musca. Linn. Fn. Suec. 1854. — 1842. Chrysoinijia, Zett. Dipt. 

 Scand. I, 155, 2. — 1S55. Low, Verh. zool. bot. Ver. V, "139. — 1862. 

 Chrysomyia, Schin. F. A. 1, 22. — 1903. Kat. palåarkt. Dipt. II, 35. 



Male. Eyes greenish, unicolorous, flnely and short haired, facets 

 in the upper two thirds larger than below, the dividing line sharp. 

 Frontal triangle with grey, depressed pubescence, face greenish, metallic. 

 Antennæ black. Thorax golden green, with very short and dense, blackish 

 pubescence. Abdomen golden green, sometimes more copper-coloured. 

 Venter black, somewhat metallic. Abdomen with very short, blackish 

 pubescence; the venter with pale pubescence. Femora brownish black, 

 yellow at the tips ; tibiæ yellow, the hind tibiæ, except the base, and 

 the anterior in the middle more or less darkened: tarsi pale yellow, 

 darkened towards the ends. Legs finely pubescent in the ordinary 

 way. Wings very slightly yellowish with brownish veins, stigma pale 

 yellow. Halteres yellow. 



Female. Eyes bare. Front broad, metallic green or blue, hinder 

 eye-margin of the same colour, broad. Golour of the body often more 

 bkiish than in the male; pubescence on thorax pale and extremely 

 short. 



Lenght 4 — 5,5 mm. 



The larva is lighter or darker brownish: of the eight bristles in 



