450 Tachinidae. 



Only the female known. Frons very broad, fully double as broad 

 as the eye; cheeks broad and jowis nearly as broad as the eye is high. 

 Orbits, cheeks and jowls grey or yellowish grey ; frontal stripe yellowish 

 red. Frontal bristles descending to end of second antennal joint. 

 Orbits with some few hairs; cheeks somewhat densely and longish 

 haired; jowls with black hairs. Eyes distinctly but qiiite sparingly 

 haired. Occiput grey, with some yellowish hairs on lower half and 

 with black hairs behind postociilar bristles. Antennæ reddish, third 

 joint more or less brownish; they are short, not reaching end of 

 epistoma, third joint aboiit twice as long as second; arista thickened 

 in basal two thirds, second joint elongated, a little geniculate to- 

 wards third. Palpi yellow, somewhat dilated outwards. Thorax 

 greyish, on the middle more brownish pruinose, with only an indica- 

 tion of a pair of narrow, darker grey middle stripes anteriorly; scu- 

 tellum concolorous with thorax. Thorax very sparingly black-haired; 

 two præsutural acrogtichals. Abdomen with the excavation on second 

 segment very small, nearly wanting; it is grey or brov.nish grey 

 pruinose all over ; on the three anterior segments more or less distinct 

 brown middle spots, forming an interrupted middle line. Abdomen 

 with rather strong, somewhat depressed black hairs; second seg- 

 ment without bristles, third with a pair of discai and marginal, and 

 fourth with a pair, sometimes a row of discai and a row of marginal 

 bristles; the bristles not strong, on fifth segment rather fme. Legs 

 yellow, tarsi darkened to blackish; anterodorsal bristles on hind 

 tibiæ somewhat strong. Wings a little yellowish tinged; veins dark 

 brown; first posterior cell closed at margin, ending just before apex 

 of wing; discai angle rounded; posterior cross- vein about midway 

 between medial cross- vein and angle; cubital vein with not small, 

 distant bristles beyond medial cross-vein. Squamulæ whitish with 

 yellowish margin. Halteres yellow with darker knob. 



Length 5,5 — 6 mm. 



D. enigmatica is rare in Denmark, only a number of females have 

 been taken at Tisvilde on ^'/é — ^"/s in 1916 to 1918 (Kryger). They 

 were taken in a peculiar way viz in the colonies of young larvæ of 

 Malacosoma castrensis; as a pair of colonies were put into a bottle 

 together with the flies, these latter attacked the larvæ and the next 

 day small parasite-larvæ were found in the Malacosoma-laryæ (Niel- 

 sen 1. c). 



Geographical distribution: — Only known from Denmark; if 

 identical with schistacea B. B. also in Middle Europe. 



