390 Tachinidae, 



Female. Similar; frons a little broader. 



Length 10 — 14 mm. 



T. sorhillans is rare in Denmark, I know only seven specimens, 

 six males and a female; on Langeland at Hjortholm; on Lolland at 

 Maribo, and in Jutland at Villebølle near Ribe and at Silkeborg; 

 tbe latter specimen taken on ^/4 the otliers bred from Saturnia pa- 

 vonia on ^°/4 — ^^"/g (Sønderup). It is otherwise known from Vanessa io, 

 Sphinx ligustri, Arctia caja, Euproctis chrysorrhoea, Lymantria dispar, 

 Mamestra oleracea and pisi and Cossiis cossus; and further from the 

 non Danish Saturnia pyri and spini, Arctia hebe and Thaumatopoea 

 pityocampa; it is especially a Saturnia parasite. In India it attacks 

 other species and likewise in America. The pupa hibernates either 

 in the ground, or generally in the host larva or pupa; it is recorded 

 to have two yearly broods in middle Europe, but according to Nielsen 

 (Vidensk. Medd. fra Dansk naturh. Foren. 69, 1918, 254) it has only 

 one in our country. 



Geographical distribution: — A very widely distributed species; 

 all Europe, the Canaries, India and Japan; towards the north to 

 Southern Sweden. It has been introduced to North America. 



Remarks: I have examined Zetterstedt's types of T. grandis, 

 two males, and found them to be the present species; I have also 

 examined the type of T. pavoniae, a specimen from Wahlberg; it is 

 a female and rather small, but I take it to be the present species. 



85. Gonia Meig. 



Species of medium to rather large size and of black or blackish 

 brown colour, with abdomen black or more or less reddish at the sides, 

 often to such an extent that it is mainly red. The genus is characteristic 

 by the shape of the head; this is a little broader than thorax, almost 

 flat behind. Frons very broad and about equal in both sexes, very 

 protruding, and together with cheeks somewhat swoln; vertex trans- 

 lucent, and the whole head of a somewhat bladdery appearance 

 and wax-like colour. Cheeks very broad and jowls about half as 

 broad as the height of the eye. In both sexes erect, outwards and 

 backwards directed ocellar bristles, inner and outer vertical and 

 two or three orbital bristles. Postocellar and occipital bristles distinct. 

 No black hairs behind postocular bristles. Frontal bristles slightly 

 descending, to about end of second antennal joint, all crossing in 

 both sexes, the last three or four placed horizontally outwards on 



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