64 J A' ACCOUNT OF BRITISH FLIES. 



with red markings. Wings dusky white and hairy; apex of the 

 halteres also dusky white. Costal vein dark brown, second longitu- 

 dinal vein straight ends at some little distance from the tip of the 

 wing. The transverse veinlet in $ is before the middle of first 

 longitudinal vein ; in the ? at the middle of first longitudinal. 

 Antennce yellowish-white, composed of 15 joints. Silvery hairs on 

 the legs. 



These willow-flies only live twenty-four hours, and are found in 

 many parts of Europe besides England. They are subject to several 

 parasites, including Tryidynms salicis, Torynms salicicola, and Fury- 

 iomus {sp. ?). 



Cccidoinyia nigra, Mg.* 



This species is placed amongst the reputed British Cecids in 

 Verrall's list. It has, however, been found in England in recent 

 years, and can fairly be entered as a British insect. The Rev. E. N. 

 Bloomfield, of Guestling, showed me many of the larvae of this species 

 a few years ago. They were remarkable for their saltatory pow-ers. 

 They affect the cores of young pears, destroying the pulp, and causing 

 the pears, when only partly formed, to drop off. They form blackened 

 tunnels from their cavity in the pulp in all directions. Mr. Bloom- 

 field found they used the " Marie Louise " pears for their nurse, 

 whilst we have found similar larvae in the "William" pear. They 

 are yellowish-white in colour, and, according to Mr. Inchbald, 

 pupate in the soil, spinning a papery cocoon enclosed in a case of 

 earth, t and also according to Bergenstamm. This possibly belongs 

 to the sub-genus Diplosis. 



C. brassicce, Wtz.t = C. iiapi, Lw. 



The larvce of this species live in the flowers and leaves of the 

 cabbage (i?. oleracea) and in the pods of Napns and C/ieira/if/ius, 

 Walker§ says as many as fifty to sixty live in one pod of the rape {B. 

 rapa). The turnip {?iapiis) suffers largely from this larva in parts of 

 England. They appear in May and June, and change in the earth. 



Imago black. Abdomen red, black bands on the dorsum. Palpi 

 white, antennas 15 -jointed, with long whorls of hairs in the ^ ; joints 

 petiolate. In the 9 the joints are sessile and the hairs much 

 shorter, antennae not half the length of the body. Base of the halteres 

 rose-coloured. Wings limpid, with black veins. First longitudinal near 



* Meigen, " .Systematische Beschreibung der bekannten europ'aischen Zweiflu- 

 geligen Insekten." Aachen, 1818, pi. iii., tig. 11. 

 t Entomologist, 1886, p. 35. 



% Lin. Ent., p. 231, Winnertz. Laboulbene, Ann. Ent. Soc, Fr. 1857. 

 S Ins. Brit., vol. iii., p. 84. 



