LEPIDOPTERA HETERQCERA. 
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 
wings 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. Cilise with black dots. 
California. Georgia. 
Group 2. 
8. Cossus P OPU LI. 
Foem. Cinereus ; palpi nigri , caput non super antes ; antennce 
nigra, subserrata , thorace paullo longiores ; pedes albido fas- 
ciati ; ala subreticulata , antica fasciis duabus perangustis 
nigric antibus, exteriore costam versus fur cata. 
Very nearly allied to C. ligniperda, but smaller and somewhat 
different in the markings of the fore wings. Female. — Cinereous. 
Antennae 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 ; palpi caput longitudine non adaquantes ; thorax 
nigro bivittatus ; tarsi cinerei , albido fascia ti ; ala antica 
cinereo reticulata, plaga postica fasciaque subapicali fuscis 
cano guttatis ; postica cinerea, apud margines cana cinereo 
reticulata . 
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. Popuh ; a brown 
patch with hoary dots on the middle of the interior border, and an 
