\ 



Syrphus. 269 



351) mentions the larva of S. americanus feeding on Siphonophora 

 avenæ. Verhoeff describes (Entom. Nachricht. XVII, 1891, 360) larva 

 and pupa of S.annulatus? {Zetterstedti); the larva was found on ^^/t 

 among Aphides on Cirsium arvense, it pupated on ^9/7 and developed 

 on "'h. Mik records (Wien. ent. Zeitg. XVII, 1898, 169) larva and 

 pupa of S.balteatus; the larva was found on '^^'h and pupated soon 

 after, the imago came on ^^h. Verrall mentions (1. c. 391, 399). 

 S. balteatus and auricoUis as bred from larvæ among Aphis primi. 

 Martelli records (Boll. del Lab. di Zool. Gen. e Agrar, in Portici, V, 

 1911, 43) the larvæ oi S.ribesii, bifasciatus, balteatus and auricoUis a.s 

 feeding on Aphis brassicae. Metcalf describes (Ohio Natural. II, 1911, 

 341) the larva of S. torvus feeding on Aphis brassicae on Gabbage and 

 on Longistigma caryæ on Sycamore. Ghampion (Ent. Month. Mag. 

 XL VIII, 1912, 215) bred S. torvus and luniger; the larvæ were found 

 among Aphides on pine-trees in May, they developed at the end of 

 May; (the author suggests from the different habits of his torvus and 

 the one mentioned by Metcalf, that perhaps the European and American 

 species are not identical). I have myself examined the developmental 

 stages of the follovving species : S. albostriatus, the larva was found on 

 the ground under old leaves on ^^U, the imago came on ^^/s; S. venustus, 

 the larva found on the ground in a wood on "'U, it pupated on ^U 

 and developed on "*/;->; S. ribesii, larvæ found among old leaves on 

 20/1, the imago came on ^'s, others were found on '/s, they pupated 

 and developed in April ; further larvæ were found among Aphides on 

 Pyrus on ^li, the imago came on ^^/t, on Rosa on ^^li, on Sambucus, 

 the latter pupated on ^*^/8, and on Urtica on '/s, pupating on ^^U and 

 developing on ^^/s; pupæ were found under a stone on ^/t and an- 

 other on ^^/t; «S. vitripennis, larvæ found among Aphides on Prunus 

 on ^/g and on '^^l(\, the latter pupated on •''"A; and developed on ^^/7 — 

 ^°/7, and among Aphides on Pyrus on ^^In, developing on ^^/e; a pupa 

 was found on the ground on '''7, the imago came on ^^/7 ; S. nitens, 

 larvæ among Aphides on Prunus on ''/c, they pupated on '-^/e and 

 developed on ^'Vn; a pupa was found in flood refuse on ^'^U, the 

 imago came on ^^/s ; S. latifasciatus, pupæ have been found, -always 

 in flood refuse, in April and May, some found on ^^^ developed on 

 2c/4_3o/j. g^ larva found on ^"Vs, likewise in flood refuse, developed on 

 ^^U; S. corollae, larvæ found among Aphides on Prunus on ^h developed 

 on ^^/(5; a pupa found on ^'h developed on ^^/h; S. luniger, a pupa 

 was found sitting on grass on '*/s, it developed soon after, another 

 found on the ground in a garden on ^"'li developed on ^^l- ; S. balteatus, 

 larvæ were found among Aphides on Sambucus on -'^7, developing 

 on ^/s, another larva was found on Brassica in August; pupæ have 



