948 
BETOLA. By Dr. M. Drattdt. 
cinerea. H. cinerea Wkr. (148 e) is whitish-grey on the forewing with quite faded markings, a faintly visible 
median band and rows of dots which are thickest at the costal and inner margins. Hindwing whitish; the 
marginal dots on both wings are distinct and strong. — The larva differs from that of borealis in the neck-spot 
being distinctly separated by reddish and bordered with yellowish-white; the dorsal saddle is twice strangulated 
towards the end of the body. On willows and poplars. In the whole United States from Canada to Mexico 
icileyi. and Guatemala. The variability of the species is great: f. wileyi Dyar is the name of the large whiter race 
from Montana and Colorado, occurring yet down as far as New Mexico, with very distinct marginal dots on 
cinereoides. both wings. f. cinereoides Dyar, on the contrary, is more intensely darkened blackish, with somewhat more 
brownish orange strewing around the transverse lines, the rows of dots, owing to shading, are more united 
paradoxa. into lines. f. paradoxa Behr, according to the type, is a very light, whitish form, its exterior resembling that 
of nivea , but invariably with distinct marginal dots and it never attains the siz£ of nivea. It originates from 
placida. California (Nevada Mts.). f. placida Dyar is an almost purely white form, the rows of dots are united into 
transverse lines, scaled orange on both sides; hindwing likewise more purely white, fringe speckled black and 
white. Described from Florida. 
nivea. H. nivea Neum. (148 e) is a rare species very near to cinerea, but large, purely white and without any 
black marginal dots; all the markings are very scanty. Type from Utah. Nothing is known of its life. — f. 
niveata. niveata B. <& Ben)., from Arizona, is also large with broad wings, but more distinctly marked; the median band 
is distinct, strangulated on the median'vein, occasionally divided into two spots, with distinct rows of dots. 
meridio- f. meridionalis Dyar is a somewhat smaller, more blackened form, more scantily scaled, the median area 
nalis. no t prominently darker, the transverse lines as indistinct as in the nomenclatural type. Texas. 
scoh- H. scolopendriiia Bsd. (148 f) resembles cinerea, but it has much more distinct markings, the median 
pendrim. | mn q narrow, strangulated, greyish-black, with intensely ochreous scales at the margins and on the subapical 
spot; 3 distinct dentate lines, the most distal one merging into the subapical spot. The greyish-white hindwing 
exhibits one or two grey postmedian shadowy bands; marginal dots small, but distinct. A variable species: 
pluvialis. - f. pluvialis Dyar has somewhat broader wings with more blurred markings, the 3 postmedian lines are not 
albicoma. clear, but more or less broken up into dots. Oregon, Vancouver, in May. f. albicoma Stkr. is somewhat lighter, 
the remarkably narrow median band is very much strangulated. The type originates from Denver (Colorado). 
aquilonaris. — f. aquilonaris Lintn. is a somewhat lighter, whiter form with less black markings; it is the typical form of 
modesta. the Eastern States from Canada to Colorado and New Mexico, in dry and hot districts. — f. modesta Huds., 
on the contrary, shows more yellowish forewings which are almost brownish distally; median band and sub¬ 
apical spot intense, scaled steel-blue. It occurs in the cooler districts of the Eastern States. — The larva resem¬ 
bles that of cinerea, the neck-spot is connected with the dorsal spot, bordered with yellow. On willow. Widely 
distributed in the United States, numbers of the typical form also from Mexico City. 
occiden- H. occidentals Lintn. resembles scolopendrina in colouring and marking, but the median band is very 
talis. q loac p black, strewn with white, with distinct black straight border-lines; the same 3 postmedian dentate 
lines, but there is distinct white filling between the two exterior ones; 5 black dots in the basal area, only 4 
in the other speciefe. Hindwing white with a large faded black median spot. In the Atlantic States from Canada 
to Texas. - - Larva of a bright green colour, neck-spot separated from the dorsal spot, distinctly lilac, mixed 
with green above, the dorsal saddle somewhat lighter than the anterior spot; intensely purple brown lateral 
spots. It lives on willows in September, October, and develops in April until June. 
56. Genus: ISetola Schs. 
Distinguished from the similarly built Cerura by only two thirds of the antennae being pectinated or 
also serrated and ciliated, the short porrect palpi, a tuft of scales on the head and a much longer abdomen with 
a split anal tuft. Forewing broader with a longer distal margin and somewhat dentate here, not entire. Neuration 
scarcely different from that of Cerura. 
Type of genus: B. aroata Sells. 
aroata. B. aroata Schs. (148 f) has very light brownish-yellow forewings, scaled steel-grey and white at the 
costal margin and above the anal angle, olive brown before the centre at the inner margin and behind the 
notched postmedian line, the olive brown colour projecting behind the cell and extending obliquely to the apex; 
a black dot in the lower cell-angle. Hindwing scantily scaled, white with a narrow brown marginal line. Vene¬ 
zuela, Brazil, Panama. 
typhon. B. typhon sp. n. (148 f) is very similar to aroata, but more than three times its size (expanse of wings: 
60 mm), apex of wing more pointed, all the colours clearer, more contrasting, costal margin light bluish-grey 
like the anal angle; the olive brown apical blotch, which is contiguous with the longitudinal blotch in the cell 
