482 Syrphidae. 



nearly cylindrical but a liltle flattened below; it shows here traces of 

 seven pairs of spined prolegs; it is rounded in front, slightly attenuated 

 behind ; the dermis is densely covered with very siiort and fine spines ; 

 on the anterior part of the dorsal side are the prothoracal spiracles 

 as two short, rounded, nearly egg-shaped, red tubes, with small, 

 scattered tubercles; at the posterior end there are some small fila- 

 ments at the sides, and at the end itself is a nearly 1 mm long, about 

 cylindrical posterior spiracular process with indications of a longi- 

 tudinal dividing line; its end is flat and bears the spiracles. The 

 puparium is of a whitish yellow or dirty yellow colour and nearly 

 7 mm long. — The pupæ were sifted in spring from flood refuse in 

 a fen; the imagines came on ^^Ib. 



Of the genus 4 species are known from the palæarctic region 

 (one of them from Ghina) ; one species occurs in Denmark. 



L T. scita Harris. 



1776. Harr. Expos. engl. Ins. 107, PI. XXXII, fig. 41 (Musca). — 

 1901. Verr. Brit. Fl. VIII, 568, 1, figs. 395—399. — 1907. Kat. palåarkt. 

 Dipt. III, 121. — Eristalis milesiiformis Fall. 1817. Dipt. Suec. Syrph. 52, 5. — 

 T. milesiiformis 1822. Meig. Syst. Beschr. 111, 347, 2, Tab. XXX, Fig. 14. — 

 1843. Zett. Dipt. Scand. II, 883, 1. — 1862. Schin. F. A. I, 349. — T. dor- 

 salis Macq. 1827. Soc. Se. Lille, 285, 1 et 1834. Sult. å Buff. 1, 518, 2. — 

 1838. Meig. 1. c. VII, 141, 3. 



Male. Verlex long and narrow, black, frons and epistoma whitish 

 yellow pruinose, the latter with a bare, black middle line; the ground 

 colour of epistoma below the pruinosity is blackish below the antennæ, 

 yellow on the middle, but black again from the lateral angles of the 

 oral margin to the eye; the lower side parts are yellowish and bare. 

 Vertex has slight. yellow hairs, at the anterior point black hairs ; frons 

 and epistoma without hairs ; the epistoma is keel-shaped, straight from 

 the antennæ to the not prominent mouth edge. Occiput greyish black, 

 slightly pruinose, the hairs yellow, not dense, short, slightly longer 

 above. Antennæ brownish or blackish, third joint nearly square. 

 Thorax black or æneous black, shining, the humeri and a spot inwards 

 to the wing-root silvery pruinose; it is clothed with short, yellow hairs, 

 on the hinder half these hairs are a little longer but sparse, and there 

 are here dense but exceedingly short, depressed, black hairs, the disc 

 is therefore here more punctate and less shining; the postalar calli 

 have short, black, bristly hairs. Scutellum black with the apical margin 

 yellow, it has short, black hairs and at the margin long, yellow, 

 almost bristly hairs. Pleura greyish white pruinose, with short, pale 

 hairs. Abdomen mainly reddish or yellow, hrst segment except the 



