1847.] Winter Insects of Eastern New York. 5 
2. Boreus srumatis. The Mid-winter Boreus. 
Polished deep black-green; legs, antenne, rostrum, and ovipo- 
sitor black; rudimentary wings brownish-black. 
Length, male 0.10; female 0.12, or including the ovipositor 
0.15. 
This species presents no very obvious characters beyond those 
already given. Its body is highly polished, shining even with a 
metallic lustre, whilst the eyes, antenna, rostrum, and legs, reflect 
the light but feebly. The ovipositor is pure black, but equally 
salendlent with the black-green abdomen. The scales which oc- 
cupy the place of the wings in the females are but faintly percept- 
ible, appearing like two minute greyish-black spots on the tho- 
rax. In the living insect, there is a light fulvous vitta, obvious 
to the naked eye, pa each side of the abdomen, at the lateral 
suture; this is frequently obliterated or but imperfectly discernible 
in the dried specimen. 
So far as I have at present observed, this appears abroad ear- 
lier in the season, and in colder weather than the preceding, 
though occasionally found associated with it on the last snows 
that fall in the spring. It is much less common than the other. 
3. Prva nivicora. The Small “ Snow-fly.’’- ho fryrron 
Black; wings grey, unclouded, a third shorter than the abdomen’, 
in the males, a third Jonger in the females. 
Length 0.20, wings expand 0.45; males smaller. 
Head shining, clothed with very short, fine hairs. Palpi 
brownish-black, sub-diaphanous. Antenne reaching half the 
length of the wings, black, setaceous, about thirty-jointed; joints 
obconic, basal one largest. Prothoraz flattened, its margins more 
smooth and shining, its disk rugulose, with a few shallow im- 
pressions; an impressed transverse line near the base and another 
near the apex. Abdomen shining, with a broad pale fulvous dor- 
sal vitta which does not extend onto the two last segments; ven- 
ter with a tint of obscure pallid at base. Seta as long as the ab- 
domen, black, setaceous, clothed with short whitish hairs; joints 
from thirteen to about eighteen in number, obconic, gradually 
shorter towards the base. Legs black, joints cylindric. Tibia 
obscure pale brown except at the tips, sub-diaphanous, grooved 
longitudinally. Tarsi, basal joint longest, second joint very short. 
Wings reaching half the length of the seta, finely ciliated at 
their tips and along their inner margins; grey, diaphanous, im- 
maculate; nervures black, robust, and very strongly marked, par- 
ticularly on the upper pair which have five closed cells in the 
disk. The male is smaller, with the wings reaching but two 
thirds the length of the abdomen, its palpi and entire tergum 
black, and the tibia darker than in the female. 
