456 Syrphidae. 



fourth segment; the fifth segment with red hairs, which are long at 

 the apex. 



Length 10— 14 mm. 



H. pendulus is common in Denmark and found on all suitable 

 localities. My dales are 1^/5— ^/lo. It occurs on the same localities as 

 the preceding species and often in company with them. I have taken 

 it in copula on ^^/e, ^^h, ^^li and ^^/s. 



Geographical distribution: — All Europe and on Madeira; towards 

 the north to northern Sweden, in Finland, and on the Faroe Islands 

 and Iceland. 



Remarks : The four species now described are similar and closely 

 allied, and they belong to a distinct group or subgenus, but they are, 

 however, easily distinguished from each other; trivittatus is at once 

 separated by the yellow epistomal stripe; of the other three pendulus 

 is distinguished by the hind tibiæ being yellow on the basal two thirds 

 and the hind femora more yellow at the apex; also the hind femora 

 are shorter and thicker, and the hind tibiæ shorter and more curved ; 

 finally hyhridus is distinguished from affinis by the quite black front 

 tarsi and the orange hind margins on the abdominal segments. Also 

 the abdominal markings are, though similar, characteristically different 

 in all four species, and trivittatus and affinis have no orange hind 

 margins on the segments while such are present in hyhridus and 

 pendulus. 



5. H. frutetorum Fabr. 



1775. Fabr. Syst. Entom. 765, 14 (Sijrphns) et 1805. Syst. Antl. 236, 

 19 (Eristalis). — 1822. Meig. Syst. Beschr. III, 374, 7. — 1843. Zett. Dipt. 

 Scand. II, 680, 4 et 1849. VIII, 3123, 4. — 1862. Schin. F. A. I, 341. - 

 1901. Verr. Brit. Fl. VIII, 534, 4, fig. 367. — 1907. Kat. palåarkt. Dipt. III, 

 110. — 1910. Beck. Berl. ent. Zeitschr. LV, 228. — Syrphus femoralis 

 Fall. 1817. Dipt. Suec. Syrph. 31, 27. — H. versicolor 1860. Malm, K. V. 

 och V. Samh. Goteborg Handl. VII, 79. 



Male. Vertex brown pruinose, frons and epistoma yellow pruinose, 

 the mouth edge and a short, triangular middle spot bare, the lower 

 side parts blackish. Vertex black-haired, posteriorly yellow-haired ; frons 

 with mixed yellow and black hairs, sometimes nearly or quite yellow- 

 haired; epistoma with long, yellow hairs. The epistoma is very slightly 

 hollowed below the antennæ, for the rest almost straight so that the 

 mouth edge is not so much produced as the antennal prominence. 

 Occiput yellow pruinose, the hairs yellow, above a row of few, long, 

 black hairs overhanging the eyes, Antennæ bright orange. Thorax 

 brownish black, dull. with two somewhat broad stripes and the sides 



