Eristalis. 421 



hairs yellow; epistoma with the sides more densely pruinose than in 

 the male. Antennæ considerably larger. Hind femora quite orange 

 and the anterior femora often with only the basal part black. Wings 

 with the cloud more distinct and reaching down to the upper branch 

 of the postical vein. 



Length 10—11 mm. 



E. cryptarum is rare in Denmark; one specimen is taken at Copen- 

 hagen, the other specimens aro all taken in Jutland at Silkeborg, Rye 

 near Silkeborg and Jerup near Frederikshavn. My dates are ^^/o — ^^/t. 



Geographical distribution : — Northern and middle Europe down 

 into France; towards the north to northern Sweden and in Finland. 



4. E. lucorum Meig. 



1838. Meig. Syst. Beschr. VII, 143, 23. — 1862. Schin. F. A. I, 337. 

 — 1914. Lichtwardt, Entom. Mitteil. III, 277. 



Male. This species is in almost all respects quite similar to the 

 common arbustorum, so that a detailed description is unneeessary. It 

 has the same rather flat epistoma without black middle stripe (when 

 uninjured). The antennal arista is, on the contrary, not plumose but 



Fig. 153. Antenna of E. lucorum 9, from the inside. X 60. 



distinctly and somewhat densely pubescent in the basal half. Thorax 

 is pruinose as in arbustorum but perhaps more densely, and the stripes 

 between the dark median stripes and the side spots are distinct and 

 going quite to the scutellum. Abdomen as in arbustorum. The legs 

 in my specimens as in the most pale-legged forms of arbustor-um, the 

 middle tibiæ whitish yellow to quite near the apex, or almost quite 

 yellow; hind metatarsi somewhat thickened. The legs haired as in 

 arbustorum, the anterior tibiæ with the same long ciliation; the femora 

 with the hairs longer, especially on the posterior femora, but less dense. 

 Female. Similar, and likewise similar to the female of arbustorum^ 

 but with the same distinguishing characters as in the male. Abdom.en 



