Neoascia. 383 



and hind tibiæ with a relatively narrow ring, while in floralis the last 

 joint of middle tarsi is darkened, liind femora black to apex and hind 

 tibiæ broadly black; the colour and venation of the wings are likewise 

 different. I think the two species as interpreted here are identical 

 with those of Meigen as they are quite in accordance with his descrip- 

 tions, only he mentions females of dispar with abdominal spots, such 

 I have never seen. I have mainly followed the synonymy in the Kat. 

 palåarkt. Dipt., but, of course, it is not certain. According to Zetter- 

 stedt (VIII, 3194, Obs., 3195, Obs.) Stæger was of opinion that Zetter- 

 stedt's floralis and dispar were varieties oi floralis Meig., and Zetterstedt 

 himself adds "non sine ratione", but this question can only be settled 

 by examination of Zetterstedt's whole material. Wahlgren (Ent. Tidskr. 

 XIII, 1907, 57) unites these species together with others xmåev floralis; 

 it is, however, certain that dispar occurs in Sweden, at all events in 

 the southern parts, for in our general collection we have specimens 

 of true dispar sent from Malm. The species mentioned by Verrall I 

 cannot interprete, they seem soraewhat diverging from typical, Con- 

 tinental specimens, 



4. N. geniculata Meig. 



1822. Meig. Syst. Beschr. III, 192, 10 {Ascia). — 1843. Zett. Dipt. 

 Scand. II, 890, 8 et 1849. VIII, 3195, 8 {Ascia). — 1862. Schin. F. A. 1, 

 322 {Ascia). — 1901. Verr. Brit. FL VIII, 473, 4 {Ascia). — 1907. Kat. 

 palåarkt. Dipt. III, 86. — Ascia aenea 1838. Zett. (nec Meig.) Ins. Lapp. 

 583, 6 et 1843. Dipt. Scand. II, 889, 7 et 1849. VIII, 3195, 7. 



Similar to the other species. Male. Vertex and frons æneous 

 black, black-haired, with a more or less distinct longitudinal furrow. 

 Epistoma protruding as in jyodagrica, yellowish grey pruinose, with 



Fig. 148. Antenna of N. geniculata ^, from the inside, x 90. 



pale hairs. Occiput black or bluish black, with whitish hairs below,' 

 black above. Antennæ with the third joint short, somewhat ovate, 

 almost not or slightly longer than broad ; arista longer than third joint. 

 Thorax æneous, densely punctate, shining; it is clothed with short, 



