CCXVlll 
APPENDIX. 
Order DIPTERA. 
Genus Ctenophora, Meigen. 
“ Parrii. Ct. black, wings brownish, with a white marginal spot towards the 
apex, surmounted by a black one, tip of the margin of the abdominal 
segment pale. 
Length of the body, 5| Lines. 
“ Descr. Female. Body blackish, with a tinge of slate colour, with the ab- 
dominal segments tipped with pale. Antennae shorter than the thorax, subse- 
taceous, serrated. Wings brownish towards their apex, at the exterior 
margin is a white spot crowned by a black one. Legs long and slender. 
“ The male of this species has probably bipectinate antennae. Tipula pectini- 
cornis, Linn, is congenerous with it. This insect abounded about pools of 
fresh water. 
Genus Chironomus. Meigen. 
“ Polaris. Ch. black, abdomen hairy, wings lacteous. 
Length of the body 4 Lines. 
“ Descr. Male. Body of a deep black, somewhat hairy. Antennae plumose. 
Wings a little shorter than the body, of a milky hue, but reflecting the pris- 
matic colours, with the marginal nervures black, abdomen slender and more 
hairy than the rest of the body. This species is nearly related to the Tipula 
stercoraria of De Geer, but is more than twice its size. 
“ The two insects last described seem to replace the hosts of gnats, (Culex) 
that are so troublesome, even in high latitudes, to navigators. The species of 
the Chironomus genus, in particular, in this country, often appear dancing in the 
sun-beams in the depth of winter, when the Culex is torpid ; it was therefore 
to be expected that their range would approach nearer to the poles than that 
of Culex. The species here described is larger than most of the southern ones 
that I have seen. 
