408 Tachinidae. 



hairs, prodiiced on the upjDer part of cheeks; jowls with black hairs. 

 Occiput grey, with white hairs, and a row of black hairs behind 

 postocular bristles. Eyes yellow-hairy. Antennæ black, third joint 

 greyish, a little dilated oiitwards; arista thickened to near apex. 

 Palpi yellow. Thorax bright whitish grey pruinose, dull, with four 

 distinct black stripes, the median narrow, diverging, abbreviated 

 behind, the lateral broad, interrnpted at the suture. Scutellum reddish 

 at apex. Thorax sparingly black-haired. Abdomen blackish or brownish 

 black, dull, greyish pruinose with shifting tessellations, apex red. 

 Abdomen black-haired, second segment without bristles, third with 

 a pair of discai and marginal and fourth with a pair of discai and a 

 row of marginal bristles. Legs black, with rather strong bristles. 

 Wings a little tinged; veins brown; medial cross- vein distinctly 

 clouded and posterior cross- vein to a slighter degree ; apical cross-vein 

 strongly concave. Squamulæ whitish. Halteres dark yellow. 



Female. Similar; frons as broad as the eye; ocellar, outer and 

 inner vertical and two orbital bristles. 



Length 7 mm. 



E. ruficauda is rare in Denmark, we have only one specimen, a 

 female, bred from a pupa, found on 1^/4 in a decaying tree at Donse 

 (Schlick), it developed on 1=^/5. I have seen only this specimen, my 

 description of the male is partly after Schiner. The species is known 

 bred from Notodonta phoebe and Larentia autiimnalis. 



Geographical distribution: — All Europe and in Asia minor; 

 towards the north to northern Scandinavia. 



93. Gymnocliaeta R. D. 



All metallic coloured species of medium size. Head about as 

 broad as thorax, convex behind and puffed out below, almost as 

 long as high. Frons above narrow in male, broad in female, rather 

 protruding, the head nearly triangular in profile; cheeks broad and 

 jowls about half as broad as the eye is high. In male ocellar and fine 

 inner and outer vertical bristles, the latter sometimes indistinct, 

 in female also two orbitals, and the verticals stronger. Behind post- 

 ocular bristles two rows of black, bristly hairs. Frontal bristles descend- 

 ing just below insertion of antennæ, all crossing in male, in female the 

 uppermost directed outwards. Cheeks bare. Vibrissæ a little ascending. 

 Eyes hairy. Epistoma somewhat short, highly retreating, but not 

 much reflected below. Oral cono and proboscis somewhat short, of 



