376 Syrphidae. 



Tahle of Species. 



1. Gro?s-veins dark seamed; antennæ with the third joint at 



least twice as long as broad 1 . podagrica. 



— Cross-veins not seamed; antennæ shorter 2. 



2. Antennæ with the third joint short, somewhat ovate; all 



tarsi with the last two joints darkened 4. geniculata. 



— Antennæ with the third joint longer; front tarsi with the 



last joints yellow • 3. 



3. Epistoma protruding as in podagrica; abdomen (normally) 

 in the male with two bands, the second broad, not reaching 

 the front corners of the segment, in the female with four 

 spots; second abdominal segment narrowest at the front 

 end, in the female evenly and not much widened back- 

 wards; hind femora black to the apex; upper marginal 

 cross-vein with the angle below nearly rectangular 2. floralis. 



— Epistoma less protruding; abdomen in the male with one 

 narrower band, going in full width to the margin, in the 

 female (normally) unspotted; second abdominal segment 

 narrowest behind the front end, in the female abruptly and 

 strongly widened backwards; hind femora yeilow at apex; 



upper marginal cross-vein with the lower angle rather curved 3. dispar. 



1. N. podagrica Fabr. 



1775. Fabr. Syst. Entom. 768, 30 {Syrphus) et 1805. Syst. Antl. 198, 10 

 {Merodon). — 1822. Meig. Syst. Beschr. III, 186, 1 {Ascia). — 1843. Zett. 

 Dipt. Scand. II, 884, 1 {Ascia). - 1862. Schin. F. A. I, 321 {Ascia). — 

 1901. Verr. Brit. Fl. VIII, 468, 1, figs. 328—331 {Ascia). — 1907. Kat. 

 palåarkt. Dipt. III, 87. — Ascia lanceolata Meig. 1822. 1. c. III, 187, 2. — 

 1862. Schin. F. A. I, 321. — Ascia maculata Macq. 1827. Soc. Se. Lille, 

 169, 3 et 1834. Suit. å Buff. 574,3. — 1838. Meig. 1. c. VII, 108, 11. 



Fig. 139. Anteimnof N. podagrica cf, from the inside, x 90. 



Male. Vertex black or purplish black, frons æneous black with 

 a longitudinal furrow. Epistoma yellowish grey pruinose ; jowls black. 

 Vertex and frons with short, brownish black hairs, just above some 



