NEMATOCERA. 73 
shaped on the under surface and pale in colour. I once found 
many on the Meadow Sweet, near Eastbourne. The metamorphosis 
takes place in the gall, Fig. 12 (3). 
/mago.—Brownish-yellow, head yellow, antennz and palpi brown, 
some faintly yellow. Thorax marked by three dark-brown stripes. 
Abdomen tawny, with bands of dark, dense hairs. Legs dark brown, 
lighter beneath. Wings dusky. Transverse veinlet indistinct, 
meeting the first longitudinal near its centre ; the second longitudinal 
vein joins the costa far from the tip of the wing. Halteres yellowish- 
brown. Oviduct long; first segment reddish-brown, remainder 
yellow. Length } lin. Kidd* describes the gall as follows: “On 
the upper side of leaf the gall is hemispherical, nearly smooth and 
pink ; small, size of mustard-seed ; on the under surface the gall is 
produced into a snout-like cone and is pubescent.” 
C. lathyri, Fefid. 
The larvee of this gnat are social and live in galls deforming the 
young shoots of Zathyrus sylvestris. SSome metamorphose in the 
galls, others in the earth. The zmago appears to be unknown. 
C. marginemtorquens, Wtz. Bremi. 
The larve live in the deformed leaf borders of Salix viminalis, 
and pupate there. They are gregarious.t The leaf-borders become 
infolded and swollen, generally in elliptical patches, but sometimes 
extending all around the leaf. When young these deformations are 
variegated with red, yellow, and green, Fig. 12 (4). The zmago is 
black ; face, sides of the thorax, scutellum and metathorax tawny. 
In the ¢ antennz are 15-16-jointed, as long as the body. In 2? 
antennz 15-jointed, only half the length of body.  Palpi pale 
yellewish-brown. Abdomen yellowish-brown, with broad black hairy 
bands on its dorsal surface. Wings covered by darkish hairs, costa 
dark, transverse veinlet pale, situated in the middle of the first 
longitudinal ; the second long. vein joins the costal at some distance 
in front of the tip of the wings. Legs dusky-brown, hairs white, 
changing to yellowish-brown in death. Oviduct long and slender at 
the end ; first segment broad and dark, remainder lighter in colour. 
C. medicaginis, Bremi.{ 
The larve live on AZedicago sativa, forming a deformation between 
leaf-stalk and stipule ; they are gregarious, and pupate in the earth. 
* Ent. Mo. Mag., 1868, p. 233. 
T Miiller, Zn. Mo. Mag. vi., 1869, p. 109, and Bremi, Mon, Gall., 1847, pl. ii., 
g. 32. 
$ Mon. Gall., p. 17, pl. i, fig. 16.—Bremi. 
