Genus Corethra. 
‘m 
Corethra pilipes. Gimmerthal. 
(Bull. Soe. Imp. Nat. de Moscow, p. 279.) 
“ Head and thorax "brown ; thorax with faint darker stripes, the middle 
one double, separated by a deep longitudinal line. Palpi and antennae 
brown. Abdomen greyish-brown, long hairs laterally, incisurae pale 
yellowish. Wings yellowish along the costa. Legs pale yellow; apices 
of tibiae and tarsi dark; legs with long hairs on the inner and outer sides; 
halteres dirty yellow. 
“ Length .—3 lines (cT). 
“ Habitat. —-Riga.” 
Note.- —The hairs are pointed out as being the distinguishing 
character of the species; but they also occur in the type of 
G. ngblaei I have examined. 
2. Corethra pallida. Fabricius. 
Tipula pallida. Fabricius 
Ghironomus pallidus. Fabricius. 
(Eut. Syst. Anti. iv. p. 245, Fabricius ; Klass. Ghironomus pallidus, “ d. Zool.” 
i. 34, Fabricius ; Syst. Nat. v. 17, p. 2026, Gmelin ; Fauna Germanica, 
cix. Meigen, Panzer; Fn. Austr. ii. 624, Schiner; Dipt. Neerland, 332, 
Yan der Wulp; Ins. Brit. Dipt. iii. Walker ; Dipt. N. Fr. 153,3, Macquart; 
Dipt. Scand. ix. 3473, 3, Zetterstedt; Syst. Besclir. i. 16, 2, Meigen.) 
Thorax pale grey, with a pale brown patch on each side near 
the roots of the wings, and also a broad median line. Abdomen 
dull transparent white, with a narrow dark band on the hind 
border of each segment, with long flaxen hairs. Legs very pallid, 
banded with brown. Cross-veins brown. 
$. Head very pale brown; eyes deep purplish-black ; 
antennae creamy, with dark brown bands at the verticils, basal 
joint creamy-white, with a dark spot on one side ; plume-hairs 
pale flaxen; palpi delicate and brown, slightly hairy. 
Thorax pale cinereous, with a clear pale brown patch on each 
side close to the roots of the wings, and a median line with very 
pale hairs on the middle line and around the bare space in front 
of the scutellum; scutelium very pallid, with dense long pallid 
hairs ; metanotum pale chestnut-brown. 
Abdomen transparent white, with a narrow black band on the 
hind border of each segment, with long pale flaxen hairs laterally 
and dorsally, as well as on the posterior borders of the segments ; 
genitalia brown, basal joints long, claspers clear and pallid. 
