proceedings of the academy of

58 PROCEEDINGS OF THE ACADEMY OF

Pamphila

rurea,nov. sp.

Expands

l-linch.

Male. Colorabove

and

below

dark

glossy

brown

; on primaries

an

oblique blackbar.

Female.

Same

color;

on

thecosta ofprimaries,near the apex, ayellowish spotdividedinto three

by

thenervures,

and two

small spots near middleof the

wing

; all these are repeated below,

and on

the diskofsecondariesare four^ obsoletepointsina transverseline.

Rock

Island, Illinois,from Mr.B.D.

Walsh.

Hesperia

vialis, nov. sp.

Expands

9-10 inch.

Colorfuscous; the only

markings

are four fine, yellowish-white spots

on

costa of primaries near

apex

; fringe long, color brown, barred with black

by

theintersection of the nervures.

Under

sidedarker, withapurple reflection

on apex

ofprimaries

and

hind

margin

of secondaries; thoraxgrey, palpilightgrey.

Rock

Island,Illinois;

Lake Winnipeg.

Descriptionofa

New CARDITJM

from the Pleistocene ofHudson's

Bay BY WM. STIMPSON.

Cakdium

Dawsoni.

Cardiumtslandicum Stimpson,

(non Chemn.)

Proc.Acad.Nat.Sci.,Phila., 1861, p. 97.

Shell subovate, oblique, veryinequilateral,

and somewhat

^{angularposteri-} orly; beaks small

and much

^elevated

;

hingethin;teethweak,especiallythepos- teriorones;ribsaboutthirty-five in

num-

ber, inthe anterior part ofthe shell nar- rower than their interspaces,inthe mid- dle

and

posteriorparts broaderarfd

more

flattened; ventral

margin

crenated.

Length

1-63; height 1*53; convexity, or breadth, 1 inch. Imperfect specimens indicate a largersize.

ThisshellresemblesC.islandicnm,{cili- atam 0. Fabr.,) in the characters of the hinge, but ^is easily distinguished

by

its obliquity

and

the great elevation of its

small beaks,the

prominence

of

which

gives

an

angularityof outline tothe

umbonial

slope, verydifi'erentfromtheevenly

rounded and more

depressed slope of the recent shell.

The

posterior ex- tremityalsois

much

lessrounded,

and

in

some

specimens the posterior

and

ventralmargins form nearlya rightangle with eachother.

The

ribs are not acute as in C. islandicum, but

more

or less flattened,

and

generallybroader than^theirinterspaces.

From

C.decorticatumS.

Wood,

ofthe English crag, this speciesdifi"ersinitsthinner hinge

and weak

teeth; from C. interruptuvi ofthe

same

author,

and

formation,

by

itsgreater obliquity,

and

the

prominence

ofthe beaks.

Our

specimens all present a character

which may

perhaps be considered specific; that ofbroad concentric

bands

of erosion,separated

by

correspond- ing crenulated ridges, indicating periodsof arrest of

growth

in the shell, at

which

periodsthe margins, being slowly formed,

were

of stronger sirbstance than

when

the depositproceeded

more

rapidly. Theseperiodswere probably annual, occurringin winter.

[Feb.

NATURAL SCIENCES OF PHILADELPUIA. 59

It

was

found

by

Mr. Drexler

abundantly on

the

beach

at

Cape Hope, on

the southeastside of

Hudson's

Bay,

having

inallprobabilitybeen

washed

outof aPleistocene deposit.

The

specimensareinthe

Museum

of theSmithsonian Institution,

under

the auspicesof

which

Mr. D. visited thatcountry.

Thisis doubtless the shell figured as a^il///a

by

E.

Emmons,

in the fourth

volume

ofthe

"Natural

Historyof

New

^{York,pi.i., fig.}9, as occurring in

thePleistocene of

Lake Champlain,

I

have

dedicatedthe species tothe accomplished PresidentofMcGillCollege, Montreal, to

whom we

are indebtedforso

much

of our knowleflgeofthe

Na-

turalHistory

and

Geologyof Canada,particularly that of^its Pleistocene de- posits.

Additionsto the

Nomenclature

ofNorth

American LEPIDOPTEBA.

BY AUG.

R.

GROTE.

Inofferingthese papers, the writer

would

refertothediflacultiesexperienced

by

the

American

studentof

Entomology

in obtaining the

knowledge

ofthe descriptions of native species; difficulties so well presented

by

Dr. T.

W.

Harris in bisCatalogueof theInsects ofMassachusetts.

And

it

seems no more than

probablethat, laboring

under

thesedifficulties, the writer

may

redescribe already

acknowledged

species.

Where

this is

broughtto his notice,hewillwillingly

and

gladly

acknowledge

his

synonyms,

giving thepriority totherightfulauthor.

NOCTU^.

Gen. Platypterix, Laspeyres.

Antennae

doubly

pectinate inthe

male

; pectinations turned towards each other; simpleinthe female. Palpiwiththree articles,of

which

the second

islongest,the third short

and

pointed.

Body

slender, shorterthanthe wings.

Wings

broad,theanteriorones with a sickle-shaped outer margin, recurving atthetips. Posteriorpairrounded.

P. f

abula,

nov. sp.

—

^Anteriorwingsdirtywhite.

From

the curvedtipa

dark brown

linewithpaler

margin

followsthe inclination of the

wing

tothe

hind

margin.

Emerging

fromthis line,

and between

it

and

the outer

margin

ofthe wing, a

wavy dark brown

line goes

down

tothehind margin,^joining

itclose tothe outer edgeof thewing.

Between

thebaseofthe

wing and

the

first

named and

broadest line,thieedistinct,irregular,

brown wavy

linescross the

wing

from the

upper

tothe hind margin.

The

second

and

third

from

the baseofthe

wing run

close together

and

unite three times, forming

two

un- equal enclosed spaces

up

toabouthalf of the wing,

and

thendiverging,

form an

outline

which

bears a slight resemblance to the profileof a face.

Two

darkspots are enclosedinthis,

and

a third

and

larger oneiscrossed

by

the thirdline near thecentre ofthe wing. Outer

margin dark

brown, deepen- ingtowards thetip. Posterior wings dirty white,with

two dark

dotsnear the

upper

edge,

and

crossed

by

several interrupted

wavy

lines, the

one

nearest the outer

margin

continued.

Body and

thorax dirtywhite. Exp.

If^inch.

A

^male,taken

on Long

Island,

New

York.

Obs. This insect bears aresemblanceinits

markings

tothe

European

P.

falcula;

itdift'ers, however, specifically

from

that speciesin itscoloring aswell as thatthe

wavy

lines

on

the anterior wings are not confluent, thus forming

no

enclosedspaces.

P.

genicula,

nov. sp.

—

Anterior wings light ochre yellow.

From

the tipacurved

dark brown

line follows the inclination ofthewingstothehind margin.

Between

thisdistinct line

and

the baseofthe

wing

three irregular

1862.]