33 
Body white; thorax obscure; shoulders grayish; neck ferruginous 
Antennae black, annulated with white; tip of the club greenish. 
Expands two to three inches. (Boisduval.) 
a. Philela .—This is a smoky or dark form of the female. 
5. P. Puotodice: 
This species has already been sufficiently described, and as here¬ 
tofore stated, is the most common native species met with in Illi¬ 
nois. 
a. Vernalis. —Male. Expands 1.7 inches. Upper side white; primaries 
have small black serrated spots at the extremities of the apical 
nervures, preceded by an imperfect abbreviated row of small black 
patches; a black bar on the arc. Secondaries more delicate, showing 
the markings of underside. 
Underside of primaries white; the spots reproduced, but pale 
colored and dilated, those at the apex tinged with greenish gray; 
an additional black patch on sub-median interspace, sometimes want¬ 
ing. Secondaries have all the nervures broadly edged with green¬ 
ish gray so that none of the white surface appears, except in narrow 
stripes in the cell and interspaces; near hind margin a band formed 
by gray serrations connecting the nervules. Body covered above 
with blue gray hairs; beneath, thorax grey white, abdomen yellow; 
palpi yellowish; antennse black above, annulated below with white; 
club black tipped with ferruginous. 
Female. Expands 1.8 inches. 
Color less pure, similarly marked, the spots larger, the discal bar 
conspicuous; secondaries show clusters of grey scales on costa and 
at outer angle and in the interspaces on the margin; underside # 
as in the male. ' (Edwards.) 
b. Beckerii —Primaries produced apically, slightly excavated on cos¬ 
tal and hind margins. 
Male. Expands 2 inches. 
Upper side pure white, the texture of secondaries slighter than 
that of primaries, discovering the spots of under surface; base of 
wings not powdered with black as in allied species; primaries have 
the apical half of the hind margin bordered by small black patches 
or clusters of scales diminishing in size to middle of margin; an¬ 
terior to these two similar sub-apical patches and a third in upper 
median interspace; on the arc a dense black sub-rectangular spot 
not reaching the costa) with central white streak. Secondaries im¬ 
maculate. Fringes white except against the apical spots, there 
black. 
Underside white; the nervules at apex and on upper hind mar¬ 
gin bordered by black scales and suffused with greenish yellow; 
the spot on interspace black, and as on upperside; cellular spot en¬ 
larged, its base broadened and posterior edge excavated. 
Secondaries have all the nervures and their branches yellow; those 
terminating on hind margin edged by broad bands of yellow green 
reaching from middle of disk and connected anteriorly; three large 
spots of same color about the cell, two being at the outer angles, 
and one above and reaching the costa; another large triangular 
sub-apical spot on costa; the nervures at base also banded with 
—3 
