Monografh of Egyptïan Diptera 53^ 



S. sYUPHus FABR, 



Fabr., Syst. Entom., 702. 172. (1775). 



.S^yA'OA'O/r.-— Sm'w/ Fabr., Syst. Antl. 248.57. (1805). 



Psilogaster LiOY, Atti. Instit. Veneto, (3) IX. 753. 12. {P-^ylo- 

 gaster) (1863-64) nec Blanch., Hym., 1840. 



Efistroijhc Walk., Ins. Sanders., III. I. 242. (1852). 



Species of moderate size, blackish or .leneous and clothed witli 

 moderate pubescence; always with yellowish markings on the face, 

 scutelluni and abdomen, but not on the pleurae, even thoiigh the 

 yellow colouring may be sometimes very faint on the face and 

 scutellum. Eyes always toiiching on the f rons in the maie, but well 

 separated in thè female ; they are usually bare and sometimes hairy. 

 Antennge moderate in length and in shape; it always bears near 

 the base of the oval third joint, a bare arista. 



Wings possess the most typical Syrphus venation, with Radius 

 4 + 5 almost straight; alula fairly well developed and when at rest 

 the wings lie parallel over each other on the abdomen. 



The métamorphoses of several species of Syrphus bave been 

 studied and in the case of some species, bave been known for a 

 long time. <S'. ribesii (a very common European species) was ob- 

 served by Linnseus and Fabricius who both speak of the larva as 

 occuring "inter Aphides." Réaumur mentions the larva of .S^. bal- 

 teatus (l) among Aphids on Prunus and Rlbcs. Verrall states that 

 it is probable tîiat De Geer's exhaustive describtion of the méta- 

 morphoses of bis Musca jnnastri referred to -S', corollœ. Fallen also 

 found the larva of .S', corollœ feeding on Aphids on Brassica 

 oleracea. Bouché bas also described the larvée of S. ribesii and S. 

 balteatus. Schiner states that he found the pupa of S. nitidicollis 

 in April under a stone in a humid meadow and that it meta- 

 morphosed after a short interval. Lundbsck says that according 

 to Brauer, Weyenberg mentioned the developmental stages of S. 

 balteatus and corollœ. Verrall says that S. bcilteatus and auricolHs 

 bave been bred from larvse found feeding on Aphis pruni. Martelli 

 mentions the larvée of S. ribesii, bifasciatus, balteatus and auri- 

 colHs as feeding on Aphis brassicœ. Lundbeck has also found 



