410 Tachinidae. 



bristly hairs. Occiput metallic green, witli dense yellow hairs; post- 

 ocular bristles long and fine and behind them two rows of black 

 hairs. Eyes longish yellowish-hairy. Antennæ black; arista thickened 

 in basal half. Palpi black, with black bristles below. Thorax metallic 

 green, black-haired, and pleiira likewise. Abdomen metallic green, 

 black-haired, with discai and marginal bristles, second segment 

 without bristles, third with three or four pairs of discai and a pair 

 of marginal, fourth with two or three pairs of discai and a row of 

 marginal bristles, fifth with bristles all over. The lamellæ of fifth 

 sternite large and long, they have a shallow incision in the lower 

 margin, the end is ronnded and turned a little downwards; they are 

 short-haired. Hypopygium small, slightly hairy; iipper forceps trian- 

 giilar, broad at base, and here incised with the corners drawn out; 

 it is ciirved backwards towards apex, but the apex itself curved ven- 

 trally and pointed; the basal part a little canaliculated, and densely 

 haired with long, backwards directed hairs; arms of lower forceps 

 rod-like, curved and a little converging towards apex, which is a 

 little dilated. Legs black, femora a little metallic. Wings more or 

 less brownish tinged; veins brownish black. Squamulæ white. Hal- 

 teres blackish brown. 



Female. Similar; frons broader and the orbits bright metallic. 



Length. Rather varying in size, 7 — 12 mm. 



G. viridis is common in Denmark; Dyrehaven, Geel Skov, Tokke- 

 køb Hegn, Hillerød, Grib Skov, Tisvilde, Boserup, Jyderup, Nyraad 

 at Vordingborg; on Lolland in Dødemose near Nysted; on Funen at 

 Faaborg, and in Jutland at Sønderborg, Sottrup and Madeskov; 

 the dates are ^/4 — 'Ve- H occurs in spring, and is most often seen 

 sitting on tree-stems, especially the males, while the females are 

 found in low herbage. It is parasitic on Ortholitha limitata and Peti- 

 lampa arcuosa, and is thought also to attack Lymantria monacha, 

 as it has occurred numerously by attacks of this species; it has not 

 been bred with us. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden. 



94. Linnaemyia R. D. 



Species of medium size, black and red in colour. Head fully as 

 broad as thorax, slightly convex behind but rather pufled out below, 

 higher than long. Frons broad, a little broader in female than in 



