DIPTERA. 187 
hairs: breast gray: abdomen obconical, much shorter than the chest, 
clothed on each side with black hairs, which are replaced by ferrugi- 
nous hairs at the base and by silvery and pale tawny hairs near the tip; 
underside clothed with white hairs: legs pitchy, clothed with short black 
hairs and bristles: thighs tinged with gray: wings very dark rich brown 
for near two-thirds of the length from the base, colourless thence to the tips ; 
the outline of the brown is oblique, nearly straight, and extends from near 
three-fourths of the fore border to near one-half of the hind border ; wing- 
ribs and veins pitchy; poisers tawny with yellow knobs. Length of the 
body 4 lines; of the wings 10 lines. 
ANTHRAX INCISA, Fem. 
Nigra, nigro-hirta, thorace viridi micante, capite thoracisque lateribus 
ferrugineo alboque pilosis, abdominis apice fasciculis duabus fulvis 
ornato, antennis nigris, pedibus piceis, femoribus anterioribus fulvis, 
alis nigro-fuscis apice oblique limpidis. 
Black: head clothed above with black hairs, in front with ferruginous 
tawny and white hairs, hoary and clothed with white hairs behind: sides of 
the peristoma tawny : mouth pitchy: chest adorned with black and bright 
green hairs, and on each side with bright ferruginous hairs, excepting the 
fore part where the hairs are white: breast gray, thickly clothed with white 
hairs: scutcheon and adjoining sides of the chest dark ferruginous: ab- 
domen obconical, shorter than the chest, clothed with short black hairs, 
adored with a tuft of pale tawny hairs on each side near the tip ; under- 
side clothed with white hairs towards the base with tawny hairs towards 
the tip: legs pitchy, clothed with short black hairs and bristles; thighs 
adorned with a tawny covering; four anterior thighs tawny: wings very 
dark brown with some slight ferruginous streaks for much more than half the 
surface from the base; the outline of this brown is very oblique, has two 
curves and two distinct angles, and extends from three-fourths of the fore 
border to beyond half of the hind border; wing-ribs and veins pitchy ; 
scales very dark brown, deeply fringed; poisers tawny with yellow knobs. 
Length of the body 6—7 lines ; of the wings 15—17 lines. 
North America. 
