268 Syrphidae. 



abdomen; when placed in Syrphus it may be known from Didea by 

 the shorter antennæ, considerably more hairy eyes, and, as said, the 

 not flat abdomen. — About the relationship of Melangyna to Syrphus 

 I have spoken above under the former genus. 



The developmental stages of several species of Syrphus are known, 

 and of some species they have been known for a long time. Already 

 Linné and Fabricius speak of the larva of 8. ribesii "inter Aphides". 

 Reaumur mentions the larva of some species, I think S. ribesii (Mém. Ins. 

 III, 1737, XI, 378, PI. 30, Fig. 0—7, Pi. 31, Fig. 8) and balteatus (ibid. 

 378) among Aphides on Prunus and Ribes. De Geer describes (Mém. Ins. 

 VI, 1776, III, 103, PI. 6, Fig. 3—9) the larva of S. ribesii among Aphides 

 on Ribes and Achillea, and the \avva. of S.lunulatus? {Musca pinastri) 

 feeding on Aphides on Pinus (ibid. 113, PI. 7, Fig. 1 — 7) and of S. bal- 

 teatus (ibid. 116). The larva of lunulatus? was taken at the beginning 

 of September, it pupated on 14 September, and the imago came on 

 -''/4 the following spring. Fallen (Dipt. Suec. Syrph. 1817, 43, 12) found 

 the larva of S. corollae {Se. olitoria) among Aphides on Brassica 

 oleracea, the imago came at the middle of August. Meigen mentions 

 (Syst. Beschr. III, 1822, 307) the larva of S. ribesii from Brassica 

 oleracea. Bouché (Naturgesch. d. Ins. 1834, 50—51, Tab. V, Fig. 1—3) 

 describes the larvæ of S. balteatus and ribesii. Vallot (Bull. Soc. ent. 

 de Fr. III, 1834, LXIV, and xMém. de l'Acad. des se, arts et bel. let. 

 Dijon, 1836, II, 242) mentions the larva of S. balteatus on Cannabis, 

 it was found in September. Zeller (Isis 1842, 828, Tab. I, Fig. 38— 43) 

 describes the larva of S. albostriatus ; the larvæ were found in No- 

 vember on stems of Betula; they pupated and developed in the fol- 

 lowing March. Zetterstedt mentions (Dipt. Scand. II, 1843, 708) larva 

 and pupa of S. ribesii among Aphides on Ribes and other piants; a 

 pupa was found on ^^/o, other pupæ developed on ^'^Ih and on ^^/o; 

 further (712) a pupa of S. melanostoma, found on -^/s; pupæ of 

 S.arcuatus (720) found attached to cabbage piants; larvæ and pupæ 

 af S. balteatus (722 and VIII, 3139), found among Aphides on Vicia 

 faba, Solanum tuberosum and Brassica oleracea, a larva pupated on 

 ^'8 and developed on ^'^/s, other pupæ developed first in October; a 

 pupa of S. tricinctus (725), which developed on ^^/t, and fmally a pupa 

 of S.cinctus (741); further he remarks of S. grossulariae (VIII, 3132) 

 that the larva is aphidiphagous, so that probably he has seen this 

 larva. Schiner (Verhandl. zool. bot. Gesell. W^ien, VII, 1857, 341) men- 

 tions the pupa S. nitidicollis found on a humid meadow under a 

 stone in April, it developed soon after, According to Brauer Weyen- 

 berg has (Tijdschr. v. Ent. XVII, 1873—74, 149) mentioned the develop- 

 mental stages of -S. balteatus and corollae. Riley (Rep. Dep. Agr. 1889, 



