Tachina. 



387 



elongated. Palpi yellow, dark at base. Thorax black, somewhat 



shining, grey or yellowish grey pruinose, with foiir black stripes, 



the median abbreviated somewhat behind the suture, the lateral 



more or less interrupted at the suture; 



scutellum dark. Thorax black-haired ; three 



postsutural dorsocentrals. Abdomen black, 



somewhat shining, pruinose as in larvarum, 



with both disoal and marginal bristles; on 



second segment a pair of marginal, third 



with a pair of discai and as a rule four 



marginal, and fourtli with a pair of discai 



and a row of marginal ; sometimes the discai 



on third segment small or wanting {eruca- 



rum Rond.). Hypopygium as in larvarum, 



but upper forceps shorter, oval, with a 



longer claw-like apex; the hairs on its upper surface directed partly 



outwards partly towards the middle line, the latter very dense and 



yellow or golden; the arms of lower forceps with the corner drawn 



Fig. 85. T. rustica (J, 

 antenna. 



Fig. 86. Wing of T. rustica. 



less out; both upper and lower forceps red or black. Legs and wings 

 as in larvarum. Squamulæ white or yellowish, with a narrow yellow 

 margin. Halteres brownish or dark brownish. 



Female. Similar, with the usual differences. 



Length 5,5 — 10 mm. 



T. rustica is more common in Denmark than larvarum; Ordrup 

 Mose, Charlottenlund, Ermelund, Dyrehaven, Lyngby Mose, Ørholm, 

 Ruderhegn, Donse, Humlebæk, Gilleleje, Tisvilde, Rørvig; on Bogø 

 south of Sealand; on Langeland at Lohals; on Funen at Odense and 

 Veflinge; on Lolland at Bremersvold, in Kældskov, at Strandby and 

 in Egholm Skov near Nysted; in Jutland at Sønderborg, in Sottrup- 

 skov, at Skeide, Madeskov, Høruphav, Hardeshøj, in Nørholm Skov 



25* 



