860 Syrphidae. 



on the postero-dorsal side and hind libiæ on the antero-dorsal side 

 (also, but to a slighter degree, present in other genera). Legs short- 

 haired as in Xanthogramma. Wings relatively iong and a little nar- 

 rowed; radial vein without perceptible bristly hairs; cubital vein neariy 

 straight. Squamulæ narrow as in Xanthogramma, fringed in the same 

 way. Plumula small, with relatively short, partly simple, partly singly 

 branched hairs. 



The developmental stages are mentioned by Mik (Verh. zool. bot. 

 Gesell. Wien, XIV, 1864, 797); the larva is described as leech-like, 

 yellowish orange, sniooth; the length is given to about 9 mm. The 

 pupa is of the size of the larva, yellowish brown, somewhat cylindrical, 

 equally rounded at both ends and somewhat depressed in the middle, 

 not unlike larger pupæ of ants, The author found the larva under 

 moss at the foot of oak-trees on ^^/.s, it pupated fourteen days later, 

 and the imago came first in May. Bremi (Isis 1846, 164) savs that 

 the larva lives in trees inhabited by ants, but without giving any 

 further elucidation, and Seholtz states (according to Brauer) the same 

 (Ent, Zeitsehr. Breslau, 1848—49). Mik's observation shows that the 

 larva hibernates. 



The single species of Doros is a large, characteristic, Wasp-like fly, 

 Of the genus only one species is known from the palæarctic 

 region, also occurring in Denmark. 



1. D. conopseus Fabr, 



1775. Fabr. Syst. Entom. 786, 26 (Syrphus) et 1805. Syst. Antl. 195, 29 

 (Milesia). — 1822. Meig. Syst. Beschr. lil, 296, 35 {Syrphus) et 1838. VII. 

 130, Tab. LXVIII, Fig. 7. — 1843. Zett. Dipt. Scand. II, 691, 1 et 1859. 

 XIII, 5087, 1. - 1862. Schin. F. A. I, 320. — 1901. Verr. Brit. Fl, VIII, 

 453, 1, fig. 320. — Doros conopeas Zell. 1842. Isis, 830. — 1907. Kat. 

 palåarkt. Dipt. 111, 80. 



Male. Frons yellow, but with a large, black, triangular spot from 

 the top angle to the antennæ, and on the sides stretching a little 

 below them; the spot is so large that only the narrow side margin 

 is yellow, so that the frons may be termed black with a narrow, yel- 

 low side margin. Epistoma yellow with a horse-shoe-shaped blackish 

 middle part, surrounding the yellow central knob and below united 

 with the broadly black mouth edge; sometimes also the knob black 

 so that epistoma only is yellowish at the sides and below the antennæ. 

 Jowls black. Vertex and frons with yellow hairs, the latter with short, 

 black hairs anteriorly; epistoma with pale yellow hairs. Occiput 

 greyish pruinose, the hairs yellow; as far as I could see no black 

 hairs above. Antennæ reddish brown, the basal joint blackish; arista 



