mn eS 
—= 
NEMATOCERA. 65 
the costa, transverse veinlet joining it near its centre. Second long. 
vein joining the costa far from the tip of the wing. Silvery hairs on 
the under surface of the legs. 
The /arve are milk white, with yellow intestine, the skin being 
granulated. Winnertz also says, “der Hinterrand des vorletzten 
Ringes mit einigen Borsten haaren bekranzt.” They are found in June. 
C. vosaria, Lw. = C. cinerearum. 
The larve form rose-shaped galls on the ends of the boughs ~ 
of various willows, as Salix alba, aurita, Caprea, purpurea, 
cinerea, etc. Each larva inhabiting a separate gall, they metamor- 
phose in the rosette. ‘The general appearance is dusky-black, with 
silvery hairs. Thorax with two stripes of silvery hairs, the sides and 
base of wings flesh-coloured, halteres reddish-yellow with brown tip. 
Antenne as long as the body in the 4, 20-22-jointed, sometimes as 
much as 24-jointed. Palpi yellowish-brown. Wings gray, iridescent, 
with blackish-gray pubescence. Costa and second longitudinal vein 
thick and black, the latter especially in the middle, and ending 
hardly in front of the tip of the wing. The second branch of the 
postical curved obliquely to the posterior border. In the ? antennz 
22-24-jointed. Winnertz says :* After death the colour of this insect 
is blackish or dusky-brown to black, with reddish-yellow bases to the 
wings. 
C. taxi, Inch. 
No cocoons are spun within the close-fitting nest of whitish leaves 
composing the interior of the gall. 
Pupa t lin. long, notched between thorax and abdomen, reddish, 
eyes black. The pupa passes up the tract of the gall, and the white 
pupal skin remains with the “ feeler ” sheaths. 
The zmago is between C. rvosaria and riparia. They live only two 
or three days. An zchneumon is parasitic on this species. 
'C. urtice, Perris, “The Nettle Gnat.”t 
This species forms pale green hairy galls in the stem and leaf of 
dioica (the nettle). June to September. A single larva inhabits each 
gall ; the first segment very slender; second broader, one-twelfth as 
broad as the third; the fourth to the seventh each a little broader 
than the preceding ; the eighth is the largest ; the segments then 
decrease until the fourteenth. No cocoon is spun. They pupate in 
the ground. 
Pupa.—Forehead broad, armed on each side by a protuberance ; 
respiratory pointed tube behind each eye on the thorax; yellow, tips 
* Lin. Ent., i., fig. 173 ii, fig. 1; iii, fig. 1; also vol. ii., fig. 23,in Bremis’ 
** Beitrage zu einer Monographie der Gallmucken.” 
+ Larva palpi (figs.), Lin. Ent, T. 8, Taf.,1. 
