LEPIDOPTERA HETEROCERA. 1515 
Male. Dark brown. Fore wings paler brown, hoary along the 
interior border, with irregular blackish reticulations, and with a dis- 
cal blackish stripe composed of five large irregular spots. Hind 
wing's pale luteous, black to about half the length from the base and 
along the costa. Female.—Hoary, shaded with pale brown. Tho- 
rax with three slender black stripes. Fore wings with irregular 
blackish reticulations, and with some discal and anterior black 
streaks. Hind wings brown, paler towards the margin, more indis- 
tinctly reticulated. Ciliz with black dots. 
California. Georgia. 
Group 2. 
8. Cossus Popuut. 
Fem. Cinereus; palpi nigri, caput non superantes; antenne 
nigre, subserrate, thorace paullo longiores ; pedes albido fas- 
ciatt ; ale subreticulate, antice fasciis duabus perangustis 
nigricantibus, exteriore costam versus furcata. 
Very nearly allied tu C. ligniperda, but smaller and somewhat 
different in the markings of the fore wings. /emale.—Cinereous. 
Antenne black, very minutely serrated, a little longer than the tho- 
rax. Palpi black, extending as far as the head. Legs with whitish 
bands. Wings slightly reticulated, with very numerous minute 
_ transverse blackish streaks. Fore wings with two very slender irre- 
gular blackish bands; one at beyond one-third of the length; the 
other subapical and forked in front. Length of the body 14 lines ; 
of the wings 28 lines. 
a. St. Martin’s Falls, Albany River, Hudson’s Bay. Presented by 
| Dr. Barnston. 
9. Cossus PLAGIATUS. 
Mas. Canus ; palpt caput longitudine non adequantes ; thorax 
nigro bivittatus ; tarst cinerei, albido fasciatt ; ale antice 
cinereo reticulate, plaga postica fusciaque subapicali fuscis 
cano guitaiis ; postice cinerea, apud margines cane cinereo 
reticulate. | 
Male. Hoary. Palpi not extending so far as the head; third 
joint very minute. Thorax with a slender black stripe along the 
inner side of each scapula. ‘Tarsi gray, with whitish bands. Fore 
wings mostly reticulated with gray, narrower and much more ob- 
lique along the exterior border than those of C. Populi; a brown 
patch with hoary dots on the middle of the interior border, and an 
