560 Syrphidae. 



with black intermingled, especially on the vertex and above the an- 

 tennæ. Hind femora not thlckened nor curved, and hind tibiæ like- 

 wise thinner, slightly curved and with no spur-hke prolongation at 

 the apex. 



Length 15—17 mm. 



This species is rather hke a Bombus terrestris. 



A. bombiformis is not rare in Denmark but it has hitherto been 

 taken only in Jutland, except an old pair in Westermann's collection, 

 labelled Sealand; in Jutland it has been taken in Vejle Nørreskov, at 

 Horsens, Frijsenborg, Marselisborg and Rye near Silkeborg. The dates 

 are ^Vt — ^^/s. It occurs in wooded districts on flowers, I have gener- 

 ally seen it on Gompositæ, especially Carduus. 



Geographial distribution: — Europe down into Italy; towards the 

 north to southern Sweden. 



2. A. mussitans Fabr. 



1777. Fabr. Gen. Ins. 306, 2—3 et 1805. Syst. Antl. 225, 6 (Syrphus). 



— 1816. Fall. Dipt. Suec. Syrph. 18, 4 {Sijrphus). — 1822. Meig. Syst. Beschr. 

 III, 345,4 {Sericomijia). — 1843. Zett. Dipt. Scand. II, 645,2 (Sericomyia). 



— 1862. Schin. F. A. I, 332. — 1901. Verr. Brit. Fl. VIII, 632, 1, figs. 

 431 — 432. — 1907. Kat. palåarkt. Dipt. III, 140. — Volucella superbiens 

 O. F. Mull. 1776. Zool. Dan. Prodr. 2093. 



Male. Vertex blackish, yellowish pruinose; frons yellow pruinose; 

 epistoma a little less descending than in bombiformis and with a still 

 smaller central knob; it is yellow, the lower side parts from the eye 

 to the apex black; it is pruinose above at the eyes from the frons 

 half way down; vertex and frons with long, yellow hairs; epistoma 

 with pale hairs only on the sides at the eye-margins, and also with 

 some hairs below on the lower side parts; the hairs at the sides are 

 long above, short and only present just along the eyes below. Occiput 

 yellowish pruinose, the hairs all yellow. Antennæ yellowish red, the 

 bristles on second joint black ; arista brownish, with long rays. Thorax 

 and scutellum æneous, shining, clothed with a long and dense, all yellow 

 or tawny pile. Pleura with long, whitish or pale yellow hairs. Ab- 

 domen blackish or dark æneous, somewhat yellowish pruinose, slightly 

 shining; it is clothed with long, all pale yellow hairs, which are more 

 erect than in bombiformis and not longer at the apex. Genitalia 

 shining, with long, pale hairs. Venter black, shining, with pale in- 

 cisures and with long, pale, on the fourth segment partly black hairs. 

 Legs all black, sometimes the anterior tibiæ and base of tarsi a little 

 brownish; hind femora only slightly thickened and curved; hind tibiæ 



