Genus Corethra. 
291 
numerous collections sent to the Museum, but have received two 
specimens privately. So far, the genus Corethra seems to be 
chiefly confined to temperate regions, only four species being 
recorded from tropical or sub-tropical climates. This may be, 
however, because they have not been collected; being non- 
obnoxious, one would not expect to find them in the collec¬ 
tions of mosquitoes sent by correspondents. Amongst these 
collections have been numerous Ghironomidae, and I may, in 
separating them, have overlooked a Corethra or two, but I do not 
think so. There is -some resemblance between Chironomus and 
Corethra generally, but they are soon separated when carefully 
examined. As I have seen so few species of this genus I have 
not attempted to tabulate them. 
The known species are as follows :—- 
C. nyblaei. Zetterstedt. 
G. pilipes. Gimmerthal. 
0. pallida . Fabricius. 
C. flavieans. Meigeu. 
C. Asiatica. Giles. 
C. punctipennis. Say. 
= C. trivittata. Loew. 
C. culiciformis. De Geer. 
C. fusea. Staeger. 
G. plumicornis. Fabricius. 
C. Maniliemis. Schiner. 
C. rufa. Zetterstedt 
G '. obscuripes. Yan d. Wulp. 
G. pollens. Schiner. 
G. antarctiea. Hudson. 
C. Braziliensis. n. sp. 
Meigen also describes a species under the name Corethra gibba. 
1. Corethra nyblaei. Zetterstedt. 
Erioptera nyblaei . Zetterstedt. 
C. pilipes. Gimmerthal (?). 
(Fig. 131, PL XXXIII.) 
(Ins. Lapponica, 830, Zetterstedt; Bull. Soc. Imp. Nat. de Moscow, xviii. 
p. 279 (1845), Gimmerthal.) 
Thorax pallid, with two brown median lines ending about 
two-thirds of the way across the mesonotum and a broad brown 
line on each side on the posterior half reaching the scutellum. 
Abdomen pale steel colour, with chestnut and ferruginous marks, 
and a dark patch on each side which forms more or less a dark 
lateral line. Legs yellowish-brown, apices of tibiae, metatarsi 
u 2 
