290 Tachinidae. 



stripe blackish brown. Orbits and jowls with black hairs. Occiput 

 grey, with whitish hairs and a row of black hairs behind postocular 

 bristles. Antennæ black; arista long, thickened in about basal two 

 thirds and evenly tapering. Palpi black at base, yellow at apex. 

 Thorax black, whitish grey pruinose, with four black stripes, the 

 median abbreviated behind, the lateral a little interrupted at the 

 suture. Thorax black-haired. Scutellum yellow on apical part. Ab- 

 domen black, whitish grey pruinose, shifting with dark irregular 

 spots according to view; it is black-haired, with marginal bristles, 

 a pair on second and third and a row on fourth segment. Legs black, 

 with rather strong bristles; on front tibiæ an antero- and postero- 

 dorsal row. Wings a little tinged; veins brown. Squamulæ whitish. 

 Halteres brown. 



Length 12 mm. 



M. silvatica is rare in Denmark, we have only one specimen, a 

 female from earlier time without particular locality. The species is 

 recorded as bred from Pieris brassicae, Sphinx ligustri, Deilephila 

 euphorbiæ and galii, Dilina tiliae, Euproctis chrysorrhoea, Gastro- 

 pacha quercifolia, Lasiocampa guercus, Dendrolimus pini, Saturnia 

 pavonia, Nonagria typhae, Cucullia verbasci and the non Danish 

 Deilephila vespertilio, Saturnia pyri and spini and Apopestes Spec- 

 trum^ and perhaps from still more; it is also recorded from Saperda 

 populnea. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden, and in Finland. 



61. Ceromasia Rond. 



. Species of medium size, the colour black with whitish pruinosity, 

 or more brown with yellowish pruinosity. Head fully as broad as 

 thorax, nearly flat behind and only slightly puffed out below, higher 

 than long. Frons in male broader or narrower, and either broader 

 in female or of about the same breadth, more or less protruding. 

 Jowls not broad, about one fourth or third of the height of the eye. 

 In both sexes ocellar and inner and outer vertical bristles, in female 

 two orbitals. Distinct postocellar and occipital bristles. Behind 

 postocular bristles rows of black hairs. Frontal bristles descending 

 to insertion of arista, or a little below, two or three uppermost reclinate 

 in both sexes. Cheeks bare. Vibrissæ ascending to near middle or 

 about, but not reaching the middle. Eyes bare (in reahty very short 



