62 AN ACCOUNT OF BRITISH FLIES. 
to the hind border. Halteres dark, with reddish tinge, sometimes 
slightly yellowish. The base of the femora yellowish beneath, tibize 
and tarsi shining white. Abdomen dark reddish-yellow, sometimes 
almost black. The oviduct is long, having the second and third 
segments yellowish-white ; no valves. 
The larve form spongy galls in the stalk and inflorescence of the 
Barberry (Barbarea vulgaris) during May and June, and, according 
to Walker, from June to November, in the folded, blister-like galls of 
Nasturtium sylvestre, also in LV. palustre and Sisymbrium Sophia. 
The larve undergo their transformations in the galls, and do not 
pupate in the ground, 
This species is figured by Winnertz,* and also by Loew in his 
“« Dipterologische Beitrage ” (Figs. 8 and 9). 
‘C. Salicina, Bouché. 
| C. Gallarum salicis. 
Cecidomyia salicis, Schrk. => Dagierk Terni 
.C. Argyrosticta, Macq. 
Black ; thorax with two stripes of whitish hairs. This insect is 
covered by silvery hairs, especially on the legs. In the male the 
joints of the antennz are 20 to 22 in number; in the female from 
22 to 24; half the length of body, longer in the male. The basal 
joints twice the length of their petioles. Wings pubescent ; trans- 
verse veinlet at the end of the basal half of the first longitudinal 
vein. Halteres dark. 
The larvee of this willow Cecid form woody galls on the boughs ~ 
and twigs of Salix aurita, cinerea, caprea, and purpurea. ‘The larve 
pupate in the galls—not in the ground, as done by many other 
Cecids. Mr. Inchbaldt describes the galls as ‘ multilocular bosses 
-on the upper twigs of S. cinerea.” They appear during June. 
. C. acrophila, Wtz. 
Black ; abdomen on ventral surface pink, with flesh-coloured 
markings on the sutures ; sides of the thorax also pinkish. Antenne, 
19 to 20 joints; as long as the body in the ¢@ ; joints and petioles 
of nearly equal length; in the ? the antennze are only half the 
length of the body ; both clothed by whorls of silvery hairs; wings 
‘silvery or whitish in some lights. ‘ Transverse veinlet placed before 
the middle of the first longitudinal vein ; second longitudinal vein 
bent forward at its junction with the veinlet ; curved hindward from 
thence to its tip, joining the costal at some distance from the tip of the 
* « Linnea Entomologica,” 1853 (pl. ii., fig. 4). 
+ Entomologist, 1886, p. 35. 
