ochri macu¬ 
la. 
replete. 
pallescens. 
medUdi.fi. 
intermedia. 
ohliqna. 
Columbia. 
ximena. 
immanis. 
mi race a. 
perobliqua. 
stramentosa. 
juvenilis. 
284 HYDROECIA. By Dr. M. Dratjdt. 
filled up with yellow; the large maculae are white, encircled and centred with red-brown, the reniform macula 
with a light yellow streak in the centre and below divided into white spots, the coniform macula parted by 
a red streak on the submedian fold; the indistinct undulate line is distally bordered with yellow. Hindwing 
yellowish-brown, towards the margin reddish. Colorado. — In the form ochrimacula B. <£• McD. (40 g) the 
maculae show ochreous instead of whitish colouring; it is probably a distinct species. 
H. repleta Bird (40 g) is extremely similar to the preceding, Imt at once discernible by dull black 
hindwings with light reddish fringes; also the forewing has a darker tint, being more brown with red irroration, 
in the basal area extensively yellow, the two transverse lines are indistinctly double, partly filled up with yellow, 
the postmedian area irrorated with purple, at the margin yellow spots, a larger one at the apex. Expanse of 
wings: 34 to 36 mm. Arizona. 
H. pallescens 8m. (40 g). Here the antennae are very short-combed or rather strongly serrate. 
Forewing quite pale reddish, in the central area particularly towards the costal margin somewhat deeper coloured, 
with white transverse lines and whitish, little marked maculae, the coniform macula being indicated by a 
strong light stripe; the white undulate line is distally bordered with red-brown; hindwing yellowish-white. 
The $ is greyer. Canada to Oregon. 
H. medialis 8m. (40 h) is very much like ‘pallescens and is best recognized by the central area not 
being darker prominent and the very much less prominent coniform macula being merely a somewhat lighter 
streak. Hindwing slightly darker, more brownish. Expanse of wings: 48 mm. Washington, Colorado. 
H. intermedia B. <b Benj. is likewise very similar, but the antennae a.re somewhat less strongly serrate, 
it is smaller, the colour as in medialis , the coniform macula better visible, almost as in pallescens , above and 
below defined by a fine darker line; the upper maculae are almost entirely extinct. Expanse of wings: 42 mm. 
Canada (British Columbia). 
H„ obliqua Harv. is somewhat darker reddish-brown than the similar preceding species, in the central 
area irrorated with a darker colour except the costal portion, with brown transverse lines bordered with whitish 
on the averted sides, and large maculae marked brown; the whitish undulate line is proximally bordered with 
red-brown. Hindwing reddish-brown with a darker postmedian line. From Dakota and Arkansas to Colorado 
and California. 
H. Columbia B. & Benj. is smaller and with narrower wings than medialis, with less strongly serrate 
antennae; from the most similar intermedia likewise separated by the narrower shape of the wings and by the 
more oblique course of the posterior transverse line which is not broken on the lower median branch, whereas 
in intermedia it forms here an angle; the subterminal area is densely irrorated with grey, and the hindwing 
is much darker brownish-grey. Expanse of wings: 41 mm. British Columbia. 
H. ximena B. & Benj. is externally recognizable by the more intense admixture of hair in the thoracal 
covering; larger and lighter than the similar pallescens, the antennal shaft is thicker, but the antennal teeth 
feebler and shorter. Forewing yellowish-white, feebly irrorated with red-brown, the transverse lines somewhat 
darker prominent, the coniform macula filled up with red-brown and surrounded with a darker colour, no lighter 
stripe, the ring-macula is filled up with yellowish-white, the reniform macula is hardly traceable. Hindwing 
yellowish-white, the veins liued with reddish-brown. Expanse of wings: 45 to 50 mm. California. 
H. immanis Gn. (40 h) is the largest species, ochreous-brown, the central and marginal areas except 
the costal portion are irrorated with red-brown, with darker veins and darker red-brown transverse lines, the 
posterior line is distally bordered with a lighter colour, and with very large maculae; undulate line indistinctly 
double, filled up with a lighter yellowish. Hindwing yellowish red-brown. United States from New York to 
Colorado. 
H. micacea Esp. has been dealt with in the palearctic part (Vol. Ill, p. 226) and figured there, and 
also occurs in Canada where it may have been imported. It differs from immanis at once in its smaller size and 
less strongly spined tarsi. 
H, perobliqua Hmps. (40 g) is much smaller than all the preceding. The yellow ground is densely 
irrorated with red-brown, the long narrow forewing in the posterior half of the median area somewhat darkened 
with oblique dark transverse lines, the posterior line distally bordered with yellow, the maculae surrounded 
with brown. Hindwing yellowish-white. Canada. 
H. stramentosa Gn. (= diplocyma Hmps.) (40 h) is a beautiful large light yellow species irrorated 
with a delicate olive-greenish colour, the costal-marginal area lmed with purple reddish, with brown transverse 
lines, the maculae surrounded with brown, the ground between them somewhat darker, the reniform macula 
on the median somewhat proximally produced. Hindwing yellowish-white. From Canada to Illinois and Colorado. 
H. juvenilis Grt. (40 i) and the following are unlike this genus, being very similar to the species of 
Hydroeciodes. Forewing on the yellow ground irrorated with brown, with red-brown transverse lines, the 
posterior line being crenulate and with a strong oblique median line; the yellow maculae are surrounded with 
red-brown; behind the undulate line there is darker irroration. Hindwing dark brown with yellow fringes. 
Kansas, Colorado, New Mexico. 
