26 
ACRONICTA. By Dr. M. Draudt. 
sim ilana. 
tonitra. 
lepusculina. 
Cinderella. 
canadensis. 
populi. 
transversa- 
ta. 
chionochroa. 
leporina. 
mocsta. 
cretata. 
innotata. 
griseor. 
betulae. 
americana. 
connected with the anal sagitta, the maculae are distinct. Sierra Nevada, California. The larva resembles 
that of felina, but it has thinner and shorter hair and feeds on willows. 
A. similana Sm. (4 b) is one of the darkest species, purple brown, strewn somewhat whitish, in the 
discal area mostly somewhat lighter; the veins striped dark; the short basal ray does not reach the anterior 
transverse line; the maculae are only traceable by blackish dots; the anal sagitta is situate in a dark spot. 
Hindwing whitish-brown, the veins and marginal area brownish. Described from Illinois. 
A. tonitra Sm. is most similar to similana, but it has more smoothly smoke-grey wings, instead of 
the irregularly strewn ashy-grey of similana. The transverse lines have the same course, the distal one is perhaps 
more strongly dentate, the subanal sagitta more distinct, before it a whitish brightening which may extend 
for some distance into the discal area. Expanse of wings: 35 to 41 mm. Missouri (St. Louis). 
A. lepusculina Gn. (4 b) is a large, faintly yellowish-white species dusted with brown, feebly darkened 
on the veins, without an anterior transverse line; the maculae are only traceable, the posterior transverse line 
is distally bordered with dark. Hindwing whitish, feebly brownish with darkened veins. United States to 
New Mexico. 
A. Cinderella Sm. (4 a) is very closely allied to lepusculina, it has somewhat narrower forewings 
much more intensely strewn with dark, the posterior transverse line being less strongly dentate and placed 
very near to the margin. Hindwing like in lepusculina. Illinois, Montana, Colorado. 
A. canadensis Sm. (4 a) is much larger, darker, and more bluish-grey; the antemedian is only traceable, 
the ring-macula entirely absent; the veins are only in the marginal area striped darker. Known only from 
Canada. 
A, populi Riley (4 b) has white forewings uniformly strewn with a blackish brown. In the marking 
the species is very much like lepusculina, from which it differs by its broader wings, the entire absence of the 
ring-macula, and the very short basal ray. Canada, United States. -—- Larva whitish, with a black head, long 
white hair, and black hair-pencils on the 5th, 7th and 12th rings and smaller ones on the 8th to 10th. On 
poplars. 
A. transversata Sm. (3 k) is a dark species with narrow Avings, the figure of which is much too 
light, very characteristic by the complete dentate median line, whereas of the anterior transverse line there 
are only spots to be seen; the marginal area is darkened. Hindwing white, in the $ with a brownish marginal 
area. Only known from Colorado. 
A. chionochroa Hmps. (4 a) is allied to lepusculina, but it has more purely white, chalky fore wings, 
but very scantily strewn with black; the basal ray is longer, the ring-macula small though distinct, also the 
anal sagitta. Hindwings of a pure white. Canada, United States. 
A. leporina L. (= vulpina Grt., sancta Edw.). This species being also palearctic has been dealt 
with in VoJ. Ill, p. 14 and figured there on t. 3 a. The American specimens are on an average somewhat more 
strewn with dark. The species is found in Canada and the United States. — The larva lives, as Avith us, on 
poplars, Avillows, and birches. 
A. moesta Dyar , distinguished from leporina only by much more intense grey strewing, has of late 
been regarded as a distinct species. British Columbia. 
A. cretata Sm. (4 e) is larger and robuster than the preceding, which it otherwise resembles very 
much. It is distinguished by its more chalky bluish-white ground-colour with more intense blackish-brown 
strewing particularly in the inner-marginal half of the discal area and behind the postmedian. Hindwing white 
with somewhat dark dusted veins, in the $ also Avith a discal spot. Canada, Colorado. 
A. innotata Gn. (= graefi Grt.) (4 d) resembles dark dusted forms of the preceding species. The 
white forewings are suffused with brown and strewn with blackish-brown, with plain, partly interrupted trans¬ 
verse lines; basal ray and sagittae entirely absent; the postmedian is more intensely shaded towards the margin. 
The silvery white hindwing exhibits a small faint discal spot and traces of a transverse line behind it. -— f. 
griseor Dyar from British Columbia is somewhat larger, more intensely dusted with a brownish black, and 
with distinct black transverse lines. The typical form is distributed from Canada to Pennsylvania. — The 
larva is greyish-brown with 2 toavs of yelloAV lateral spots, with whitish hair. It lives on hickory and birches. 
A. betulae Riley (4 c) differs from the preceding by its distinct sandy yelloAvish colour only scantily 
strewn with dark; the maculae are encircled by a reddish brown, the postmedian being also reddish-brown, 
proximally bordere dwith Avhitish, distally with ochreous-yellowish, the anterior transverse line distinctly double. 
From NeAv Hampshire to Pennsylvania and Missouri. -—- Larva brown, flattened, with a lateral row of fringy 
hair, with dark dorsal tubercles and scanty short hair. It lives on birches. 
A. americana Harris (= acericola Guen.) (4 d) is the largest species and thereby unmistakable. Dark 
greyish-brown with distinct, sharply dentate, double transverse lines, in the marginal area somewhat darker, 
