Baccha. 367 



Remarks: In the collection of Tonder Lund and Sehestedt there 

 are two specimens, a male and a female, labelled B. elongata ; both 

 are obscuripennis; yet I have made no alteration, for I am not certain 

 that the said specimens are the types; Fabricius says: "Habitat in 

 Dania", but he does not expressly refer to the collection of Tonder 

 Lund and Sehestedt; the specimens are labelled "e Gentofte" which 

 is a place near Copenhagen, but Fabricius may possibly have described 

 his species from Danish specimens in his own collection. Further I 

 should not be inclined to any alteration of the name, as the distinct- 

 ness of the two species elongata and obscuripennis is scarcely quite 

 beyond doubt. 



2. B. obscuripennis Meig. 



1822. Meig. Syst. Beschr. III, 199, 4. — 1843. Zett. Dipt. Scand. II, 

 894, 2 et 1849. VIII, 3196, 2. — 1862. Schin. F. A. I, 326. — 1901. Verr. 

 Brit. FL VIII, 456, 1. — 1907. Kat. palåarkt. Dipt. III, 82. 



Male. This species is highly similar to elongata. Vertex more 

 black; frons æneous, shining, not pruinose; epistoma somewhat shining, 

 slightly pruinose. The hairs on vertex, frons and epistoma dark or 

 black, on the latter paler below. Occiput grey pruinose below but 

 black above, and the hairs above more or less dark. Antennæ with 

 the basal joints blackish, the third more or less dark brown. Thorax 

 with the humeri not or almost not pale; the hairs slightly shorter 

 than in elongata, blackish or brown. Pleura not pruinose, the pubes- 

 cence brownish, somewhat distinct. Abdomen not bluish at the base, 

 the markings darker and less distinct than in elongata, otherwise 

 varying in the same way; the long hairs at the sides often dark. 

 Legs darker, often more or less brownish, especially the hind pair; 

 also the hairs generally darker, often mainly brown. Wings strongly 

 brown; stigma more or less blackisk. Squamulæ smoky with the 

 fringes brownish yellow. Halteres more or less brownish, 



Female. Still more similar to elongata, but the frons with a 

 black, shining middle stripe, which goes down to the antennæ and 

 here is widened. Antennæ with the third joint generally darker than 

 in elongata. Pleura as a rule less, or not at all, pale. Abdomen 

 with the markings more distinct than in the male, and the hairs 

 always pale. Legs paler than in the male. Wings not strongly 

 tinged, about as in the female of elongata. 



Length 7—10,-5 mm. 



This species is in the male distinguished by the not pruinose 

 frons and the strongly brown wings, and it is also darker haired 

 on head and thorax. while the colour of the hairs on abdomen and 



