2 BULLETIN BROOKLYN ENTOM. SOC. VOL. VIL May 1884. ] 
v 
Acronycta betulae, N. Sp. 
By Pror. C. V. RILEy. 
An interesting and easily recognized species. of the genus Acronycta 
has, to some extent, been distributed by me under the above MS, name 
and I would herewith characterize it: ‘ 
Acronycta betulae, N. Sp. 
Average expanse 37 mm. Gen- 
eral color clay—yellow or pale 
buff with silver-gray hues. Ma- 
culation subobsolete, except the 
t.p. line. Form of body and 
wings most nearly approaching 
tritona, i.e. primaries short, 
broad and with apex rectangu— 
lar. None of the ordinary lon— 
gitudinal marks at base or be- Acronycta_betulae: a larva, dorsal view; fimago-nat. 
tween veins I and 2 or 6 and 7: size: 6 a middle segment of larva, dorsal view; ¢ do. side 
; A view; @ portion of larval skin showing spinose covering; 
the ordinary maculation much e cremater of pupa with'spines, dorsal view. 
as in innotata but in faint fuliginous and sienna; orbicular usually quite obsolete; where 
indicated it is by relief basally of the t.a. paler line and posteriorly by the paler space 
between it and the reniform which is more plainly indicated, especially on the basal side, 
by a sienna border. ‘I.p. line as in Giraefii, the inner angle between veins 6 and 7 more 
pronounced but without the tooth of tritona, the outer angle on vein I more pronounced 
and acute; well relieved basally by silver-gray and posteriorly by a sienna-brown line 
and coincident subterminal shade. Posterior border usually shows a distinct pale 
line, the fringes being either of the general hue or darker with paler interruptions on 
the veins. Secondaries well rounded, clay—yellow with very faint discal and trans— 
verse, fuliginous shade. Head and thorax concolorous with primaries except a slender 
brown streak on outside border of tegulze. Under surface uniformly pale clay—yellow 
with discal and transverse shade on secondaries intensified, and similar shades on pri— 
maries, the transverse line strongly elbowed: borders of wings, especially of secondaries, 
may also be dotted with brown though usually concolorous: antennz: beneath, front 
tarsi and a patch on outside of palpi dark brown. 
6 usually more strongly marked than Q. Claspers of j' consisting of a long 
curved hook with a broad excavate main shank and an inferior broad tooth or projection 
having parallel sides. 
Described from 9 <j's 4 Qs reared from larvee feeding on Betula nigra. 
Larva. Average length when full grown 38 mm. Color greenish-gray before 
last molt with a whitish medio-dorsal, and an undulating sulphur—yellow subdorsal 
line, more or less distinct. After last molt vinous-brown without the, dorsal lines. 
Sparsely covered (head and legs included) with short white or gray hairs arising from 
pale papillze and thickest at sides and subventrally, so as to give a somewhat gastropa— 
chiform aspect. The general surface of the body which appears smooth to the naked eye 
