DRYOTYPE; LITHOMOIA; GRAPTOLITHA. By Dr. M. Draudt. 
193 
H. discinigra Wkr. (28 a). The grey forewing is irrorated with blackish-brown from the base to the discinigra. 
undulate line; the transverse line is rather indistinct, a little bordered with grey, the maculae in grey rings; 
the whitish undulate line is proximally irrorated with dark, behind it the veins are darkened. Hindwing 
greyish-brown. Canada. 
H. algens Grt. (27 k). Porewing brownish-grey with blackish, crenulate transverse lines and black and algens. 
white vein-streaks behind the distal line, the maculae in grey rings, the ring-macula obliquely elliptic, in the 
reniform macula often some orange scaling; behind the grey, brown-edged undulate line at the anal angle a 
blackish spot. Hindwing brownish-grey. Canada to Colorado. 
H. iris Zett. (= erasis H.-Schaff., semisigna Wkr., erdmanni Mschlr., senescens Grt.) is a species also iris. 
distributed in the palearctic region (cf. Vol. Ill, p. 123, pi. 28 d). Forewing reddish-brown, strewn with whi¬ 
tish, particularly on the veins, with rather indistinct transverse lines, the maculae surrounded by an intense 
black, the ring-macula above and below open; the undulate line consists of white dots proximally bordered 
with red-brown. Hindwing of a yellowish-grey colour. As to the variability cf. the palearctic part. -— f. vigi- vigilans. 
Ians Grt. is a deep red-brown form with a contrastingly white reniform macula, the undulate line being distallv 
bordered with an intense white colour, the cell filled up with black before and between the maculae. Labra¬ 
dor, Canada down to New York. 
36. Genus: I>ryotype Hmps. 
Separated from Litholomia by a feeble rough frontal projection, pectinate antennae and several 
small tufts on the first abdominal rings. Only 1 species: 
D. opina Grt. (28 a) is on the purple brown forewing strewn with grey with single transverse lines opina. 
being double only at the costal margin, the posterior line distally bordered with purple red; maculae irrorated 
with whitish and surrounded with black; the undulate line consists of small ochreous lunae, proximally with 
small black sagittary spots with a W below the centre. Hindwing whitish, at the margin brownish, in the $ 
darker. From California. 
37. Genus: Lithomoia Him. 
This genus contains but one species, being also distributed and well-known in the palearctic region, 
with long, narrow wings, a smooth frons, with finely serrate B antennae; the thorax is chiefly covered with 
scales, in front and behind with tufts, the rough-haired abdomen with a tuft on the first ring, towards the 
anus laterally covered with hair. 
L. solidaginis Hbn. (cf. Vol. III. p. 124, pi. 30 e). The American forms of this species exhibit a genital solidaginis. 
organ somewhat different from that of the European forms, the uncus being narrower, also the valves of a 
different structure, but the northern forms from Alaska and British Columbia are in this respect somewhat 
more similar. — f. albertae Bird. ( = morrisoni B. & Ben].), from Alaska and Canada, is marked like Eu- albertae. 
ropean specimens, but the forewing and hindwing are much darker, particularly the latter specimens from 
British Columbia have also blackish-brown hindwings. but the forewing is lighter, but generally the central 
area is darker. — f. germarsa Morr.. from the Eastern States up to British Columbia on the whole re- germana. 
sembles European specimens more, but the forewing is of a brighter colouring, and the markings, particularly 
the anterior transverse line, is more distinctly marked, the hindwing is light. New York, Ottawa, Ontario; 
Californian specimens form the transitions to them. -— The beautiful, red-brown larva with a yellow lateral 
stripe lives on species of Vaccinium. 
38. Genus: Graptolitha Hbn. 
A large, also palearctic genus with narrow-winged species with a straight distal margin. Proboscis 
developed, eyes large, frons smooth. The thorax is covered with hair and hair-like scales, the frons and 
vertex with minute hair-tufts, the collar with a slight central keel, on the prothorax with a parted tuft, 
metathorax with a loose tuft; abdomen flat with dorsal tufts on the first rings, and laterally hairy (cf. also 
Vol. Ill, p. 124. where the genus is united with Lithophane Hbn., the latter, however, has not a flat ab¬ 
domen). 
G. semiusta Grt. (28 a). Forewing on the light grey ground irrorated with a bright red-brown colou I', semivsta. 
with dentate transverse lines being on the averted sides bordered with greyish-white, behind the distal line 
with black and white vein-streaks and with whitish-ringed maculae; before the whitish undulate line red- 
brown shading. Hindwing blackish-brown with whitish fringes. Canada to New York. 
G. bethunei Grt. & R. (28 a) is much paler, more whitish, with double, crenulate transverse lines, beitmnei. 
which are connected on the submedian fold by a black streak; the maculae are surrounded by orange-brown, 
behind the distal transverse line with a double row of vein-dots; the whitish undulate line is proximally 
