incolorata. 
mexicana. 
cana. 
flavescens. 
dyarensis. 
tenera. 
laticosta. 
eutecta. 
yuella. 
1084 NORAPE. By Walter Hopp. 
Santo, Paraguay, and the Itatiaya (Brazil). Zerny captured both the forms at the same time on the Lower 
Amazons. 
16. Genus: JSorape Wkr. 
Norape Wkr. (Mallotodesma Wall., Ulosota Grt., Sulychra Btlr., Anarchylus Dyar) is characterized with 
the 10th male abdominal segment by the absence of the real uncus, or it may be quite rudimentary, while the 
socii are unpaired, grown together, mostly representing a flat, glandular, partly ciliated small chitine-leaf. In 
some cases this organisation is not to be recognized directly; thus the formation is indistinctly paired at the 
end in incolorata, or it shows lateral paired lobes in puella, nigrovenosa, albilineata , glabra, pamjiana, which are 
thus probably closely allied, or it is massive and conglobate at the end in cingulata and vesta, or long, cylin¬ 
drical in rothschildi which shows an interesting adaptation: the socii being originally feeling organs replace 
here the uncus which operates as a clasp-hook. 
The colourings and markings of the Norape-species are probably always to be regarded as rudimentary, 
as they coincide with a relatively more original structure of the 10th male ventral segment. The pigments are 
at any rate no reliable marks of distinction for a species of the Trosiinae, and in this respect also a great number 
of Norape-species, which can be distinctly determined by the male sexual armature, are inclined to variations. 
For purposes of discrimination, we have divided the Norape-species according to their pigment-colourings. 
However, some species exhibit variably coloured wings, while in others the yellow colouring of the head and 
abdomen vary, and black-legged species partly occur also with white legs. When speaking of white or black 
legs, this always refers to the middle and hind legs, as the forelegs are invariably blackened on their insides. 
A. Species recognizable by pigments of the wings: 
N. incolorata Jones (160 i). Greyish-brown, all the parts rather intensely tinged, especially on the 
costal area of the forewing. Forewing smooth, without stripes. A rare species from Castro, Parana (Brazil). 
N. mexicana Schs. (Archylus, Anarchylus) (160 i). White, forewing with a black dot at the end of 
the cell and at the end of the inner-marginal vein. Antennae long, light. Mexico. 
N. cana Dogn. (Sciathos. Trosia) (160 i) is hitherto known only from the environs of Bogota in Colombia, 
where it occurs in three transitory chromatic forms: silvery white with a grey shine, or distinctly grey, or more 
or less suffused with lemon colour. The latter form has been described as — flavescens Dogn. (Malmella) (160 i). 
The forewing shows a fine black costa. Tibiae and tarsi black. Vertex of head yellow. Abdomen suffused with 
yellow. Collar whitish or yellow, anteriorly edged with black. The antennae of the males vary in length, espe¬ 
cially also in the width of the pinnae. The neuration of the wings varies in some respects. 
N. dyarensis Hopp (nec terena Dogn.). Only 1 specimen is at hand, from Mt. Tolima (Colombia). Fore¬ 
wing scantily scaled, distinctly striped and with a bright silvery gloss, white, tinged with brownish, the hind¬ 
wing more whitish. Head, thorax, abdomen, legs white. 
N. tenera Drc. (= Archylus tener Drc., Ramaca achriogelos Dyar) (160 i) is distinctly marked, forewing 
with hardly noticeable stripes. Collar blackish, sometimes also white. Thorax white or blackish, metathorax 
mostly black. Abdomen without yellow colouring. All the tarsi blackish. The neuration of the wings varies 
in some respects. Mexico and Arizona. 
N. laticosta Dyar (160 i) is white, with a broad black costa of the forewing, and likewise very feebly 
striped, without a silvery gloss. Head yellowish around the antennae, vertex white. Collar white, more rarely 
narrowly blackish. Abdomen purely white, without yellow. Tibiae and tarsi blackish. The species is closely 
allied with tenera owing to the male sexual armature. Mexico. — eutecta Dyar (Mesoscia) (160k) is only a pigment- 
form of laticosta flying at the same time (June) and places in Mexico; the sexual armature is the same, the 
neuration of the wings varies in the same way, and the head is also yellowish around the antennae, the vertex 
white. Tibiae and tarsi blackish. 
N. puella Wkr. (= pectoralis Wkr.) (160 k) is the type of the genus. Characterized by fine black areas 
between the veins of the otherwise white, transversely striped, glossy forewings. Vertex yellow, though with 
white basal tufts around the antennae. Abdomen white, middle and hind legs white. South-East Brazil, for 
instance Rio de Janeiro, Itatiaya, Sa. Catharina, Parana, Fsp. Santo. 
