Genus Corethra. 
30 L 
11. Corethra obscuripes. Van der Wulp. 
(Tijdschr. v. Ent. ii. 1601, et Dipt. Neerlandica, p. 333.) 
“ like C. rufa, but darker in colour. Thorax ash-grey, with dark 
brown lines, a lateral line between the neck and root of the wings, 
narrow, pale grey; scutellum brownish; abdomen dark brown, with 
greyish incisions. 
“ Legs brownish-grey; coxae and bases of the femora yellowish; 
hairs on their venter brown; wings of a grey tint, with pale brown 
veins; halteres yellow.” 
Habitat —Holland (Yan der Wulp). 
Observations .—This species can be told from C. culiciformis by 
not having yellowish hairs on the abdomen, and from G. fusca by 
the brownish-grey, not yellow, legs as in G. fusca. (F. Y. T.) 
12. Corethra gibba. Meigen. 
(Nouveau Diet. d’Hist. Nat. Art. Corethra.') 
“ Green, with the wings white, marked with an obscure band.” 
Note.— This is all I can find about this species, which should, 
however, easily be identified if a true Gorethra. 
13. Corethra fallens. Schiner. 
“ Very like C. Maniliensis, only the legs are not uniformly coloured.” 
14. Corethra Antarctica. Hudson. 
(Manual Ent. N. Zealand, p. 43, pi. iv. fig. 3.) 
Hudson figures this species in his “ Manual of New Zealand 
Entomology,” but gives no description except that it is “ an 
elegant little gnat frequenting the margins of ponds and ditches 
during the spring months.” 
Regarding the larva and pupa, he writes as follows — 
“ The larva is bright green, ornamented with numerous yellow spots; 
it is very sluggish, living in the green slime weed which floats on the 
water in such large masses during that season. Not being very common 
it is difficult to find, as its colour so closely resembles that of the weed 
which it always frequents. The pupa is not very agile, and is nearly 
