Actia. 465 



hairs below. Antennæ with the basal joints red, the third dark brown; 

 the third joint is large, five to six times as long as second, broad and 

 dilated with lower anterior corner rounded; arista rather long, with 

 both first and second joint elongated, of equal or about equal length, 

 the third about twice as long with basal half thickened. Palpi yellow. 

 Thorax grey, without stripes; scutellum of the same colour. Four 

 postsutural dorsocentrals. Abdomen grey or yellowish grey, the prui- 

 nosity densest and palest on front half of third and fourth and on 

 all the fifth segment. Bristles as usual. Legs brownish yellow, femora 

 more or less darkened on posterior side of front femora and anterior 

 gide of posterior femora. Wings very slightly tinged; veitis blackish 

 brown; posterior cross-vein placed a little nearer to the angle than 

 to the medial cross-vein; anal vein not reaching margin; only cubital 

 vein with bristles, stretching to medial crogs-vein. Squamiilæ white. 

 Halteres with the peduncle yellow, the knob blackish. 



Female. The female is not known with certainty. Stein men- 

 tions a specimen with first joint of arista less elongated which he 

 thinks belongs here. 



Length 4,5 mm. 



A. nigrohalterata is rare, I possess only two specimens, both 

 males, one I took in Ordrup Mose on '/g 1907, the other is from Jut- 

 land at Sønderborg, also taken in May (Wiistnei) ; further Villeneuve 

 described it from a Danish specimen, also a male, from Hoed south 

 of Grenaa, taken on ^^/g 1912. The type to articulata Stein is the above 

 mentioned specimen from Ordrup Mose. 



Geographical distribution: — Besides in Denmark the species 

 also occurs in Germany and Belgium, according to a communication 

 from Dr. Villeneuve. 



8. A. bicolor Meig. 



1824. Meig. Syst. Beschr. IV, 354, 199 {Tachina) et 1838. VII, 243, 10 

 {Thryftocera). — 1849. Zett. Dipt. Scand. VIII, 3231, 41—42 {Tachina). — 

 1862. ScMn. F. A. I, 519 (Thryptocera). — 1894. Pand. Rev. Entom. XIII, 

 112, 7 (Thryptocera). — 1900. Stein, Ent. Nachricht. XXVI, 133. — 1907. Kat. 

 palåarkt. Dipt. III, 387. — 1921. Baer, Zeitschr. f. angew. Ent. VII, 372. — 

 1924. Stein, Arcli. f. Naturgesch. 90, 6, 132, 4. 



Male. Frons much broader than the eye, slightly protruding; 

 jowls about one third of the height of the eye. Orbits and face brownish • 

 yellow; frontal stripe reddish brown. Orbits sparingly with black 

 hairs, produced a little below the frontal bristles; jowls with black 



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