380 



Syrphidae. 



segment; the spots may be very small and obsolete and in rare cases 

 the first or both pairs may be quite wanting. 



Length 4 — 5 mm. 



The larva and pupa are described above. 



N. floraUs is less common in Denmark than podagrica ; [Amager, 

 Utterslev Mose, Ermelund, Dyrehaven, Lyngby Mose, Fm-e Sø, Ørholm, 



Fig. 143. Fig. 144. 



Abdomen of N. floralis. 



Fig. 143. Male. Fig. 144. Female. 



Geel Skov, Ruderhegn, Hillerød; on Lolland in Kældskov, Dødemose 

 and at Strandby west of Nysted; in Jutland at Hald near Viborg. 

 My dates are ^^/s— ^^/a, but it seems especially to occur in May and 

 June and again in August as noted by Stæger in Zetterstedt VIII, 

 3194. It occurs in the same way as podagrica; 1 have taken it in 

 copula on ^Ve and ^^le. The larva was taken in Utterslev Mose in 

 flood refuse at the end of April, it developed first in May (Schlick). 



Geographieal distribution : — Northern and middle Europe down 

 into France, and probably also to Italy; towards the north to northen 

 Sweden, and in Finland. It occurs perhaps also on the Ganaries 

 {analis Macq). 



3. N. dispar Meig. 



1822. Meig. Sysl. Beschr. III, 188,4, Tab. XXVII, Fig. 27— 28 (Ascia). 

 — 1843. Zett. Dipt. Scand. II, 887,3 et 1849. VIII, 3194, 3 et 1855. XII, 

 4676, 3 (Ascia). — 1862. Schin. F. A. I, 321 (Ascia). — 1901. Verr. Brit. 

 Fl. VIII, 470,2, fig. 332 (Ascia). — 1907. Kat. palåarkt. Dipt. III, 85. 



Similar to floralis but, however, distinctly different. Male. Vertex 

 and frons æneous green, with no or a shght longitudinal furrow; the 



