554 Syrphidae. 



part of the tail is evidently the prolonged last segment, and it has 

 also as usual filaments on each side, one pair at the base and one at 

 the apex (probably a third pair of filaments in the middle are over- 

 looked); near the anterior end are two short, recurved anterior spira- 

 cular tubes ; they have the small tubercles placed in half-rings on the 

 posterior side; the small warts mentioned by the author, placed at 

 the anterior end are evidently the larval spiracles. On the ventral 

 side are six pairs of prolegs with hooks, and besides one pair on the 

 sides of the mouth opening ; the flat, band-shaped bristies at the anus, 

 mentioned by the author, are, I think, the same organ or bundle of 

 threads which is known in several Syrphid larvæ protruding from 

 the anus. 



Of the genus 3 species are known from the palæarctic region, 

 all occurring in the northern and middle Europe ; one has been found 

 in Denmark. 



1. T. vespiforme L. 



1758. Linn. Syst. Nat. X, 593 et 1767. XII, % 986, 44 et 1761. Fn. 

 Suec. 1811 {Musca). — 1775. Fabr. Syst. Entom. 769, 93 {Syrphus) et 1805. 

 Syst. Antl. 188, 4 (Milesia). — 1816. Fall. Dipt. Suec. Syrph. 9, 3 (Milesia). — 

 1822. Meig. Syst. Beschr. III, 232, 5 (Milesia). — 1843. Zett. Dipt. Scand, II, 

 857, 3 (Milesia). — 1862. Schin. F. A. 1, 366 (Spilomyia). — 1907. Kat. 

 palåarkt. Dipt. III, 144. 



Male. Vertex long, black, the anterior part yellow or white pruinose ; 

 frons and epistoma yellow or whitish yellow pruinose, the frons with 

 a narrow, black middle line ending with a black triangle above the 

 antennæ, epistoma with a middle stripe and the lower side parts 

 black; vertex with black hairs, the yellow anterior part bare; frons 

 without hairs; epistoma with pale, erect hairs on,the lower half, dark 

 on the black lower side parts. Occiput yellow pruinose along the 

 eye-margin, this colour disappearing above, but occiput again greyish 

 pruinose on each side of the vertex; the hairs longish, yellowish, above 

 they are all or nearly all black and somewhat long. Antennæ yellow, 

 third joint roundish ; arista longer than the antennæ. Thorax black, duU 

 or very slightly shining; on the middle there are two faint, grey stripes, 

 diverging a little behind and united in front; they are abbreviated 

 behind the middle; the humeri, the præalar calli and inwards on the 

 transverse furrow, the postalar calli ånd a spot forwards from them 

 and a triangular spot in front of scutellum are yellow pruinose, the 

 inner part of the spot on the transverse furrow paler, whitish yellow; 

 thorax is clothed with somewhat long, black hairs, longest behind; 

 they are yellow on the yellow spots and anteriorly on the grey middle 



