104 Syrphidae. 



O. intermediet is like the two preceding species rare in Denmark, 

 we have in all eleven specimens; Lyngby JVtose (Schlick, the author), 

 Hillerød (Godskesen), and a specimen in Westermann's collection la- 

 belled Sealand; on Funen at Faaborg (Schlick), and one specimen 

 from earlier time, probably from Horsens in Jutland. The dates are 

 from June and to the first part of August. 



Geographical distribution: — Besides from Denmark the species 

 is hitherto known also from Posen and Sweden, and according to 

 specimens sent to me from Mr. Th. Becker also from Silecia and Ural. 



Remarks: The three species elegans, geniculata and intennedia are 

 very similar, but however very distinct; elegans is distinguished from 

 the other two by the banded eyes and the long antennæ, and geni- 

 culata is distinguished from intennedia by the shorter eye-suture in 

 the male, by the stigma dark at the base, the thick and infuscated 

 middle cross-vein and the shape of the upper marginal cross-vein. 

 Besides there are characters in the frons, the breadth of epistoma, 

 the side dust spots, the relative length of the arista and still more. 

 A very curious character is that the female of geniculata has not, as 

 the male, the hind femora black setulose beneath, v^hile this is distinctly 

 the case with the females of the two other species. — It is curious 

 that the banded eyes of elegans have not been mentioned since Meigen 

 and Zetterstedt, (though it is mentioned by Girschner in his work 

 "Einiges iiber die Fårbung der Dipterenaugen," Berl, Ent. Zeitschr. 

 XXXI, 1887, 161) even not by Loew, but yet I think, that it is elegans 

 he describes in Stett, Ent. Zeitg. 1, c. (otherwise it would be a new 

 species which might be indicated by the strongly sinuous upper mar- 

 ginal cross-vein in the figure). For the rest the descriptions allow 

 well to decide the species the authors have had before them; thus it 

 is evident, that Verrall describes geniculata as elegans both from his 

 description of antennæ, wings and the colour of the legs, as well as 

 from the figures of the wings; likewise it is evidently my new species 

 intermedia which Loew and Zetterstedt ment ion in the piaces cited 

 above, but those authors seem to have seen only the male, 



4. O. brevicornis Loew. 



1843. Loew, Stett. ent. Zeitg. IV, 269, Tab. III, Pig. 19—21 et 1857. 

 Wien. ent. Monatschr. 1, 7. — 1862. Schin. F. A. I, 272. — 1901. Verr. 

 Brit. Fl. VIII, 188, 2, figs. 199-200. — 1907. Kat palaarkt. Dipt. III, 15. 



Male. Head a little broader than high. Vertex, frons and epistoma 

 black or bluish black; frons with a dot-like, somewhat longitudinal 

 impression; epistoma broad, widening downwards, with a greyish 



