DIPTERA. 357 



female, together with tlie small size and fascination of getting good 

 mounts, make this an interesting microscopical object. 



Cecidomyia (Dasyneura) crat.egi, Winn. 



This species is found on the common thorn, but more especially on 

 clipped hedges. The gall (fig. 324) is often a common and familiar 

 roadside object. It is formed of a tuft or rosette of leaves on the 

 tips of the young shoots, and generally on shoots at the top of the 

 hedge, which grow after the previous year's cutting. There is gener- 

 ally only one gall on the top of each shoot, but they are often found 



Fig. 322. — Cecidomyia margineiiitoniHeiis Fig. 323. — Cecidomyia inavLjiiiem- 



(iiiiilc). torqueus (fnnn!r). 



so numerous that scarcely a twig is left untouched. The larva:', live 

 gregariously within the cluster of the deformed sessile leaves. Each 

 leaflet is thickly studded with short, stiff, blunt, erect hairs, which 

 provide protection for the larv*. 



"Imago black, with yellowish palps. Antennpp 16-jointed in 6, 

 15-jointed in ?. Oviduct long, and yellow at the tip. Sides of 

 thorax and metathorax flesh - coloured. Abdomen flesh - coloured, 

 with black bands. Halteres white. Wings hyaline ; black jiubesc- 

 ence and costa. Second long, vein bends forward at its junction 

 Avith the transverse veinlet, then, passing in an almost straight 

 line, joins the costal a little distance from tip of wing. Length, 

 f lin." 1 



' An Account of British Flies, by Fred. V. Theobald, p. 67. 



