382 Syrphidae. 



black in the basal half, tibiæ with a more or less distinct, often faint 

 or almost wanting brown ring in tlie middle; hind femora black with 

 the basal third or fourth yellow and also with the tip yellow, hind 

 tibiæ with a sharply defmed black ring below^ the middle, on the 

 ventral side just the two side margins are black from the ring to the 

 base, thus forming two narrow stripes; front metatarsus with a dark 

 spot above, last joint of middle tarsi not dark, hind metatarsus and 

 the two last joints blackish. Wings hyaline or almost so ; the lower 

 angle at the upper marginal cross-vein more roundly curved than in 

 foralis; the veins somewhat pale at the base. 



Female. Frons a little broader than in the male. Abdomen is 

 relatively narrower at the base than in floralis, with the second seg- 

 ment abruptly dilated backwards, almost twice as broad at the apex 

 than at the base and with the sides strongly incurved, and abdomen 

 is broader behind and much more clubbed than in floralis; it is not 

 bluish but quite æneous and more coarsely punctate, and it has no 

 spots. Wings slightly tinged. 



Length 4 — 5,5 mm. 



iV. dispar is about as common in Denmark as podagrica ; Ordrup 

 Mose, Ermelund, Dyrehaven, Lyngby Mose, Ørholm, Ryget Skov at 

 Farum Sø, and i Jutland at Hald near Viborg. My dates are ^la—'^^h; 

 it seems thus in contrast to floralis to occur only in spring and early 

 summer. It occurs on the same localities as the other species, and 

 in the first part of the season also in company with them. I have 

 taken it in copula on ^^/r.— ^^/s, on ^le and ^"^/e. 



Geographical distribution: — Europa as it seems down into Italy ; 

 towards the north to northern Sweden, and in Finland (if Zetterstedt's 

 dispar is really this species, see below under Remarks). 



Remarks: The two species floralis and dispar are rather similar, 

 but as seen from the descriptions distinguished without difficulty and 

 with certainty; dispar differs from floralis by only one band on ab- 

 domen in the male and the immaculated abdomen in the female; 

 when specimens of floralis occur which in this respect are similar to 

 dispar, the shape and breadth of the band on third segment in the 

 male are characteristic ; a never failing character is the shape of second 

 segment, which in floralis is narrowest at the front end but in dispar 

 behind the front end; this is especially the case in the female w'hich also 

 has abdomen relatively narrower at the base and much more clubbed 

 and broader behind in dispar, but also in the male the character is 

 distinctly present; further characters are found in the epistoma, the 

 colour and punctuation of the body and in the legs, of which in dispar the 

 last joint of middle tarsi is yellow, the hind femora yellow at apex 



