acutangula. 
hiemalis. 
simplex. 
crucialis. 
per Mails, 
cognata. 
minorata. 
februalis. 
curialis. 
indurata. 
nicalis. 
tantiva. 
argns. 
Candida. 
dolosa. 
rubriea. 
156 XYLOMYGES. By Dr. M. Draitdt. 
more robust; the undulate line is more coherent and connected with the apex by an oblique streak; the reniform 
macula is a large, dark, indistinctly defined spot. -— - acutangula Sm. (22 g) is of a light bluish-grey ground¬ 
colour with distincter double transverse lines, the median shade being present, too; the subterminal area is 
darkened in contrast with the light marginal area; the coherent distinct undulate line forms subapically a 
sharp tooth. All these forms varying to almost purple black tints, fly in California together with the type. 
X. hiemalis Grt. (= californica Behr) (22 g) is similar, but more mixed with brown and with a distinct 
basal ray, with a well developed coniform macula and with more or less distinct orange strewing in the centre 
of the larger maculae, before the undulate line with small black sagittae. Hindwing whitish brownish-grey. 
Canada to California. 
X. simplex Wlcr. (— pallidior 8m.) (22 g) has the white ground-colour of the forewing densely strewn 
with greyish-brown, an intense black basal ray, the transverse lines only marked by costal-marginal streaks, 
the posterior line also by streaks on the veins, all the 3 maculae are present and encircled with black, the ring- 
macula obliquely wedge-shaped, above open, before it the cell is filled up with black, and it is separated from 
the large, somewhat orange-strewn reniform macula by an oblique black costal-marginal shade; instead of 
the undulate line there are black sagittae. Hindwing white with fine black marginal streaks. From Canada 
to Colorado and California. — The green or brown larva with fine white longitudinal stripes lives on various 
shrubs. 
X. crucialis Harv. (22 g) is very similar, the shape of the wings is somewhat broader, rounder, the 
apex less sharp, the ground-colour more a slightly bluish greyish-white, only in the macular filling with orange- 
brownish scales, some also behind the postmedian line; all the markings are thicker and deeper black, otherwise 
arranged almost the same. On the white hindwing a thick dark discal luna and small black postmedian striae 
on the veins. From California. — f. peritalis Sm. (22 g) is tinted more brownish, the maculae being inclined 
to flow together, with less distinct transverse lines. From Oregon and Colorado. 
X. cognata Sm. (22 h) is a very variable species, on the forewing tinted and strewn more or less intensely 
brown, grey or ochreous-yellowish, with double transverse lines, the posterior line single and dentate, and with 
large, often confluent maculae; the whitish undulate line is on both sides spotted blackish, the marginal area 
behind it darkened, the fringes speckled black and white. The white hindwing is strewn with blackish. Canada 
(Vancouver); Oregon; Colorado. — minorata B. <£■ McD. (22 h) from California is a smaller, monotonously 
olive-grey form with quite indistinct markings. 
X. februalis B. <L • McD. (22 h) is similar to cognata, with much more contrasting colours and markings, 
the marginal area- being almost quite black, intensely mixed with black and white, near the base of the wing 
and round the reniform macula tinted olive-ochreous. Hindwing white, strewn with smoky grey, with a thick 
dark discal spot and marginal line as well as a fine bent median line. California. 
X. curialis Grt. (22 h) has bluish-grey forewings densely dusted and strewn with brownish-black, 
on the folds often tinted reddish and on the veins striped black; the transverse lines are quite indistinct, the 
posterior line consists of dots on the veins, the maculae are indistinctly encircled with black, the reniform macula 
below more or less blackish and distally reddish; before the grey undulate line black sagittae. Hindwing purely 
white. California. —- indurata Sm. (22 i) from Colorado and Durango is a larger, paler form. -— nicalis Sm. 
(22 h) is likewise a large, light form tinted more bluish-grey and in the 3 slightly reddish, with almost entirely 
extinct markings, only the anterior transverse line and the undulate line being traceable, and the reniform 
macula composed of a reddish diffuse spot; described from Washington. -— - tantiva Sm. (22 i) is more dusted 
with a bluish grey, the costal margin and marginal area more densely dusted, the undulate line is a distinct light 
line with a dark nebulous stripe before it, both sexes being marked rather the same. Arizona. — f. argus Sm. 
has narrower forewings dusted with ash-grey, all the markings indistinctly visible, both the anterior transverse 
lines double, the posterior line single. California. 
X. Candida Sm. (22 k) is on the bluish-white forewings densely dusted and strewn with black, with 
undulately dentate black transverse lines, and the maculae with whitish rings, brownish-black pupils and encir¬ 
cled with black, distally at the reniform macula generally reddish dusting; before the grey undulate line there 
are small blackish sagittae. Hindwing of a pure white. From Canada and Oregon. 
X. dolosa Grt. (22 i) is similar to Candida, but it has a more greyish-white ground-colour, except 
the proximal-marginal and distal-marginal areas densely strewn and dusted with black, and very conspicuous 
by the large white coniform macula being confluent with the ring-macula; in the marginal area the veins are 
striped black. The white hindwing is scantily strewn with black. United States (Maine, New Hampshire, 
White Mts., New York, Plattsburgh, Colorado). 
X. rubrica Harv. (= perlubens auct nec Grt.) (22 i) has brownish-grey forewings being discally dusted 
with brownish-red as far as the costal margin and the undulate line, above the lower median vein often dusted 
