NEMATOCERA. 65 



the costa, transverse veinlet joining it near its centre. Second long, 

 v^ein joining the costa far from the tip of the wing. Silvery hairs on 

 the under surface of the legs. 



The larvic 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. rosaria, Lw. = C. cinerearum. 

 The larvae form rose-shaped galls on the ends of the boughs 

 of various willows, as Salix alba, aurita, Caprea, purpurea, 

 dnerea, 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. 

 Antennae as long as the body in the ,$ , 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 ? antenna; 

 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. 



Ft/pa I 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 imago is between C. rosaria and riparia. They live only two 

 or three days. An ichneumon is parasitic on this species. 



C. Jirficce, Ferris, " 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. 17; ii., fig. i ; iii., fig. I ; also vol. ii., fig. 23, in Bremis' 

 " Beitrage zu einer Monographie der Gallmiicken." 

 f Larva palpi (figs.), Lin. Ent. T. 8, Taf. i. 



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