Syrphus. 265 



My dates are ^^/g— 'Vo. I have taken it in the same way as the pre- 

 ceding species, and also in company with it, and Mr. Henrii^sen tooic 

 it at Fiskebæk on ^"/s on a meadow on Umbelliferæ together with 

 pyrastri, and he told me, that it was present there in some number. 

 Zeller gives (Isis 1842, 829, 12) as possible cause to its rarer occurence 

 that it hovers and rests much higher above the ground than pyrastri, 

 and Verrall (1. c.) records the same; this seems also to some degree 

 to be the case, and it is in accordance herewith that I have more 

 than once taken it in my room on third floor, attracted by flowers 

 in an open window. 



Geographical distribution: — All Europe, towards the north to 

 northern Sweden, and in Finland; further in South-east Asia, on 

 Madeira and in North Africa. 



19. Sypplius Fabr. 



Species of medium or somewhat large size, moderately hairy and 

 of black colour with yellow bands or pairs of spots on abdomen. 

 Head somewhat semiglobular, generally squarely roundish in circum- 

 ference; it is as broad as, or a little broader than high, in rare cases 

 rather low and broad, and it is as broad as, or slightly broader than 

 thorax; behind it is somewhat excavated. Eyes touching in the male, 

 separated in the female by a broader or narrower vertex and frons. 

 The frons is in the male triangular, not inflated, broader or narrower, 

 the upper angle rectangular or generally acute ; only in rare cases the 

 frons is broader, somewhat inflated, and the upper angle obtuse as 

 in Lasiophtkicus. Eyes bare, sometimes slightly hairy, and in a group 

 of species with more or less long and dense hairs; in reality the eyes 

 are in most of or all the so called bare-eyed species a little hairy, 

 but the hairs are short and scattered, and only seen by a close 

 examination. The eye-facets are in the male a little enlarged in the 

 upper part\ and in a single case (armatus) there is a distinct upper 

 area of larger facets. Antennæ inserted above the middle; they are 

 somewhat short, the third joint roundish, oval or elongated oval; 

 arista inserted dorsally more or less near the base of the third joint; 

 its basal joints very small, generally only seen by the microscope; it 



1 Osburn says (Journ. of N. Y. Ent. Soc. XVIII, 1910, 59) that in all Syrphidae 

 the facets of the upper central part of the eye in both sexes are larger than 

 those around the border and upon the lower half; in this I cannot agree; in 

 the females the facets are, at all events practically, of the same size, while the 

 difference in the male is distinctly observable. 



