526 Syrphidae. 



hind femora; its hind tibiæ have as in forum no erect ciliation below 

 and its hind trochanters have a short spur. 



X.florum is a rare species in Denmark and until 1915 we had 

 only six specimens, four from earlier time without particular locality, 

 one taken in Dyrehaven at MøUeaaen in 1914 (the author) and one 

 taken at Tisvilde in 1913 (J. G. Nielsen); in 1915 1 found it in some 

 number in Egebæks Vang; it occurred along a brook in the wood 

 on piaces where there were many tree-stubs and rather rich vegetation, 

 and it was here flying together with segnis, but florum was present in 

 greater numbers ; it was often seen sitting on the stubs, and no doubt 

 it had its breeding piaces here; I took also a specimen in Nyrup Hegn 

 in the vicinity. The dates are '^^h—^^ii. 



Geographical distribution : — Europe down into Italy ; towards the 

 north to northern Sweden, and in Finland. 



Remarks: The synonymy of X. nemorum and florum has been 

 somewhat confused; the synonymy I have followed here is also found 

 in Verrall's Brit. FL, but in the appended Gatalogue of the Syrphidae 

 he has in contrast to it another synonymy, which latter is adopted in 

 the Kat. palåarkt. Dipt., but it is not correct; Verrall takes here, as 

 said above (515), hifasciata apud Zett. as a synonym to nemorumFa.hr., 

 while it was stated above that it belongs to tarda Meig., further he 

 has nemorum apud Zett. as synonym to florum Fabr. and florum apud 

 Zett. as synonym to nigripes Zett. Through the kindness of Dr. S.Bengts- 

 son in Lund I have had opportunity to study specimens of nemorum 

 and florum from Zetterstedt's collection, and they proved that nemorum 

 apud Zett. is florum Fabr. (as generally adopted), and florum apud Zett. 

 is nemorum Fabr ; I have therefore not followed the Kat. palåarkt, 

 Dipt. The synonymy I have thus adopted is for the rest already 

 found in Wahlgren (Entom. Tidskr. XIII, 1909, 75, 76). It is just 

 possible that nigripes Zett. is only a variety of nemorum (as Schiner 

 thinks), and if so nemorum Fabr. includes both nigripes Zett. and 

 florum Zett. 



41. Syritta St. Farg. et Serv. 



Rather small, elongate and narrow species of black colour with 

 yellow spots on abdomen; they are very short-haired. The genus is 

 somewhat allied to Xylota. Head relatively long, semiglobular, as 

 broad as high and a little broader than thorax; it is somewhat ex- 

 cavated behind. Eyes large, bare, touching in the male for a moderate 

 distance, separated in the female; in the male the facets are some- 

 what strongly enlarged but only on a small space about the suture. 



