G32 
DREPANA; FALCARIA; GRETA. By Dr. H. G. Dyar. 
1. Genus: 3>a*epaiia SchranJc 
As to the details about this genus we refer to Yol. II, p. 199, and Vol. X, p. 463. In America there is 
but one representative of these tiny insects which are chiefly developed in the palaearctic and Indian regions. 
They are distinguished from the other Drepanid genera by the presence of a broad and short accessory cell on 
the forewing which is somewhat falcately extended at the apex. The exterior and the biological conditions do 
not differ essentially from those of the European species. 
arcuata. D. arcuafa Wkr. (= fabula Grt.) (86 c). The wings are whitish straw-colour, darker shaded centrally, 
crossed by three or four wavy lines centrally and submarginally, and a strong even brown line that runs to the 
falcate apex. This is the common form from Nova Scotia and New York, but it also occurs in Canada, New 
Hampshire, Massachusetts, and Indiana; instead of the cell-end there is here a dot which is separated from 
gcnicula. the median line. genicula Grt. is a darker yellow, less distinctly marked form in which particularly the median 
grotei. lines are faint, often somewhat smaller. — grotei B. <b Benj. is the form belonging to it from Alaska with a 
dark brown ground-colour shaded with grey, broader and'more faded lines and a much larger reniform macula. 
siculifer. —- siculif es* Pack, is larger than arcuata , of a yellowish ground-colour, not dark shaded centrally, with a larger 
reniform macula, in this respect very similar to the European fatcataria. California, British Columbia. — 
alaskacnsis. alaskaensis B. & Benj. is the Alaska-race of siculifer with more intense markings; besides the shading is more 
intense, so that the central area is considerably darker than the basal and marginal areas, whereby the total 
impression is cpiite different. Ketchikan (Alaska). Larvae on alder; green, subdorsal tubercles of joints 3, 4 
and 6 prominent, a subdorsal brown line, more or less shaded across behind joint 6; head transversely banded. 
2. Genus: Falcarfa Haw. 
Separated from the preceding genus only by the undulate outer margin of the forewing. The only 
species is the American representative of the European lacertinaria which is not separated from Drepana in 
Vol. II. 
hilineata. E. bilineata Pack. (86 cl). Whitish straw-colour to brownish yellow; two parallel brown lines across 
forewing, a minute discal dot, and more or less distinct brown strigae. Northern United States from Atlantic 
to Pacific; western specimens are often larger than eastern ones, but the difference is not so decided as in D. 
levis. arcuata. — • The form levis Huds. has the forewing smooth brownish yellow with the strigae faint or absent; 
ramparten- besides it is generally smaller than the typical form. It may be partly a season-form. — rampartensis B. & Benj. 
sis - is intermediary between the eastern bilineata and the European lacertinaria , but darker than the latter, blackish 
brown, with intense dark brown strigae, the lines as in the preceding form, the anterior line inwards lighter, 
with a whitish indistinct subterminal line, and red-brown and w’hite dusting at the apex. The wings are 
hudsoni. somewhat less dentate. Ramparts (Alaska). — hudsoni B. &• Benj. corresponds to levis, it is somewhat smaller 
and without the strigae. From the same habitat at the same time. Larva dark brown, somewhat obliquely 
whitish shaded on the sides, with prominent tubercles, giving a rough appearance. It lives on birch. 
3. Genus: Oreta Wkr. 
Somewhat larger and stronger species exhibiting particularly in the Indian Region a profuse development 
of forms (cf. Vol. X, p. 479). They chiefly differ from the preceding genus in the longer and narrower accessory 
cell. 
rosea. 0. rosea Wkr. (86 e). Forewing pinkish-brown with 2 shaded darker lines, the outer angled subcostally, 
with small dark irrorations; forewing with a broad submarginal band, often containing two round dark dots 
marginata. above tornus; hindwing with the outer half yellow, except apically. — In marginata Wkr. the basal rosy of 
irrorata. forewing is more or less replaced by yellow. - - irrorata Pack, show's no yellow at all, but it is rosy throughout. 
Northeastern North America. Larva on Viburnum; brown, the dorsal region paler; in the middle two dark 
lateral angles nearly meeting dorsally. Head notched, anal segment produced into a long spinous tail. 
0. adona Streck. The author mentions it from Florida; according to the description it entirely resembles 
the palaearctic O. extensa Wkr., which it may prove to be, with a wrong locality label or accidental occurrence; the 
Drepanidae are entirely boreal in America, without any tropical forms. A large, yellow form largely overlaid with brown; 
inner line of forewing wavy, light, outer line straight from outer third of inner margin fo falcate apex; hindwing largely 
dark, the anal angle broadly pale. 
*) Hampsox, Fauna of British India, Moths vol. 1, p. 347. 
