Publ . 21 . VIII . 1927 . 
BYRDIA; AZA; HEMEROCAMPA. By Dr. W. SchauS. 
537 
2. Genus: 15yr<lisi n. gen. 
cj. Antennae bipectinate without terminal bristles. Palpi porrect clothed with long hairs. Legs 
very hairy, hind tibiae with a single pair of short spurs. Forewing: venation as in Notolophus, the areole long 
and narrow. Hindwing: vein 2 before angle; 3 and 4 approximated at base or shortly stalked; 5 slightly 
above angle; 6 and 7 from upper angle or shortly stalked. 
Named in honour of Commodore Byrd, first man to fly to the North Pole. 
Type: Byrdia rossii Curtis. 
B. rossii Curtis (72 a). Male. — Body above slate colour, underneath mottled with light neutral rossii. 
grey. Forewing grey irrorated with drab, less so on basal third; lines black; a broken subbasal line; ante- 
medial line sinuous, well defined; postmedial fine, irregular, partly followed by a black shade; subterminal 
black shade more irregular than in figure, outwardly with a diffuse white shade. Hindwing cream colour, the 
margins broadly black and the veins partly fuscous. Arctic America. 
B. groenlandica Home. Male with much narrower wing, black mottled with grey. The male in Nat. groenlandi- 
Mus. in very poor condition, the wings rubbed and partly distorted. Greenland. ca - 
2a. Genus: i/,a Wlcr. 
The type of this genus described by Walker in Cat. Lep. Het. B. M. 32, p. 384 is lost as kindly communicated by 
Mr. Tams. The description says: Male: body slender; proboscis absent; Palpi short, slender, porrect, acute, not surpassing 
the head; antennae very largely bipectinate. Legs slender, rather short. Wings thinly scaled, semihyaline, anterior wings 
with the apex rounded, hindwings much longer than the abdomen. 
Type: A. micacea Wlcr. 
Druce described a second species as Aza; according to the communication of Mr. Talbot the type, now in the Hill- 
Museum, is a Lymantriid and is to be inserted here: 
A. eutelida lire. Male. — Head, antennae and thorax pale brown; abdomen white; legs yellow. Primaries eutelida. 
white, the costal and outer margin edged with yellowish-brown; secondaries white. Expanse: 1% inch. Hab. Sarayacu, 
Ecuador. Talbot writes that the hind-tibiae have one pair of spurs. If the drawing he sent is correct it shows an areole 
which would bring it in the same group as Notolophus and Byrdia which are northern species. 
3. Genus: Dyar. 
Differs from Notolophus in having a single pair of spurs on hind tibiae. Female with wings aborted. 
The species all offer considerable variation and are more easily separated by the larvae. 
Type: H. leueostigma 8m. <b Abb. 
H. leueostigma S. & A. (= leucographa Geyer, intermedia Fitch, borealis Fitch, obliviosa Hy. Edw.) leueostigma. 
(72 a). Forewings light drab suffused with pale brown; antemedial irregular darker shaded from costa to median 
vein; postmedial line fine; outcurved below costa, followed by a dark costal spot; the white spot near angle 
very small or obsolete. Hindwing drab with pale cilia. In some specimens all the markings are very faint. 
Atlantic States. 
H. vetusta Bsd. (72 a). Forewing brown, the two lines black well defined, the white spot at inner vetusta. 
angle distinct; hindwing brown, the termen darker shaded. — Ab. gulosa Hy. Edw. (72 a) smaller, the lines gulosa. 
more confused; white spot at inner angle smaller. — Ab. cana Hy. Edw. (72 a). Forewing greyish, the two cana. 
lines black, distinct, the white spot at angle very faint or absent; hindwing brown, paler than in typical species. 
California to Alaska. 
H. plagiata Wkr. (72 a). Forewing reddish brown; a broad fuscous subbasal space, followed by a plagiata. 
faintly wavy thick black line, finer and incurved on inner margin; medial space from costa to median vein 
whitish containing a slightly oblique discal spot finely outlined with black; postmedial line black, finely wavy, 
outcurved beyond cell, inbent to inner margin; a subterminal whitish line defined by black, slightly curved 
at costa. Hindwing fawn colour. Described from unknown locality. 
H. inornata Beut. (72 a). Also rather variable, the larva very distinct, approaching that of leuco- inomaia. 
stigma. Fore wing mottled drab and brown, the lines more broadly dark shaded, the reniform space whitish 
crossed by black lines; the white spot near inner angle almost or entirely obsolete. Hindwing drab shaded with 
brown. Atlantic States. 
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