378 
CATALOGUE OF 
Genus P^DISCA. 
North America. 
75. P^UISCA INQUIETANA. 
Foem. Fusca ; abdomen cinereum; alee antica cinerece, apice 
rotundatce , at.omis fasciisque quatuor indeterminatis diffusis 
fuscis ; posticce fuscescente-cinereoe. 
Female . Brown, cinereous beneath. Palpi cinereous, porrect, 
slightly fringed, nearly as long as the breadth of the head; third 
joint elongate-conical, about one-fourth of the length of the second. 
Abdomen cinereous. Fore wings cinereous, somewhat rounded at 
the tips, with brown speckles, and with four irregular, excavated, 
and diffuse brown bands ; costa straight ; exterior border slightly 
convex, very oblique. Hind wings brownish cinereous. Length 
of the body 4 lines ; of the wings 12 lines. 
a. Arctic America. Presented by Sir J. Richardson. 
76. PiEDISCA DIFFINANA. 
Foem. Nigricante-cinerea ; abdomen cinereum; alee antiece ob- 
scure argenteo-cinerece , oxutce, slrigulis transversis plurimis 
fuscis , f asciis duabus fuscis indeterminatis ex parte nigro 
marginatis ; posticce ceneo -fusca, fimbria cinerea fusco inter- 
lineata . 
Female . Blackish cinereous, dingy cinereous beneath. Palpi 
porrect, much shorter than the breadth of the head; second joint 
fringed above ; third conical, less than one-fourth of the length of 
the second. Abdomen cinereous. Fore wings acute, dark silvery 
cinereous, with numerous little transverse brown streaks, and with 
two brown very irregular partly blackish-bordered bands ; costa 
hardly convex ; exterior border slightly convex, moderately oblique. 
Hind wings seneous-brown ; fringe cinereous, interlined with brown 
near the base. Length of the body 4 lines ; of the wings 10 lines. 
a. St. Martin’s Falls, Albany River, Hudson’s Bay. Presented by 
Dr. Barnston. 
77. PiEDISCA CATACLYSTIANA. 
Foem. Pallidissime cervina ; abdomen albidum ; alee antiece 
acuta , vix falcala, lineis longitudinalibus subargenteis , strigis 
