AIDOS; XENARCHUS. By Walter Hopp. 
1099 
All the species are interrelated, some of them are extremely variable in size and colouring. About the 
biology we have already spoken in the introduction to the family. 
1. Genus: Aidos Hbn. 
Aidos Hbn. (= Brachycodion Dyar). The characters of the genus have been mentioned in the intro¬ 
duction. 
A. amanda Stoll (164 a). Very variable in size and colouring, widely distributed: Mexico, Guatemala, amanda. 
Panama, Colombia, Venezuela, Guiana, on the whole of the Amazons, Ecuador, Paraguay, South-Eastern 
Brazil. The species is easily discernible from all the others by the hindwing showing blackish veins which are 
conspicuous at least in the costal part of the wing. The forewing is divided by brown and whitish scales into 
broad transverse bands which partly show an outward black pointedly dentate edge, though the bands become 
indistinct according to the predominance of the brown or whitish scales. Under surface brown or whitish with 
brown veins. Hindwing generally broad red only at the inner margin; the red colouring is more extensive in 
Mexico where also $9 with an orange *basal area occur. 
A. yamouna Dogn. (164 a) has uniformly red hindwings, while the forewings are brown, strewn with yamouna. 
white in the costal centre of the cell, with a darker zone beyond the cell. Wings beneath red, the costal and 
apical districts broadly greyish brown. Loja, South Ecuador. — The species thus represents only an extreme 
form (hindwing without any brown), whereas other forms are partly farther distributed. — nuncilla Dogn., nuncilla. 
from Colombia (Tolirna), is discernible from it by the interspersion of black scales on the hindwing. In — cyno- cynosura. 
sura Dogn. (164 a) the distal margin of the hindwings is brownish or with a black streak at the angle, while 
the 99 are red only in the basal area, the distal half being brown. The colouring of the fore wings varies consi¬ 
derably between whitish and brown. Colombia, Amazons, Peru, Bolivia. 
A. perfusa Sch-s. (164 a) is recognizable by the whitish-yellow basal area of the forewing extending to perfnsa. 
the cell and exhibiting an oblong black spot at the base of the costa, a roundish one before the inner margin. 
The distal margin is broadly blackish brown, interrupted by an indistinct whitish line. Hindwing red, with a 
broad blackish brown distal margin. Thorax whitish, suffused with brown in the middle. Abdomen red, with 
a narrow blackish dorsal zone. The red colouring varies between light pink and dark red, the brown colouring 
between light brown and blackish-brown. Both wings beneath red on the basal halves, whitish grey on the 
distal halves. The form — admiranda Schs., from Costa Rica, is merely a variation of the species. Widely distri- admiranda. 
buted: Costa Rica, Panama, Colombia, Guaina, Venezuela, Ecuador, Peru, throughout the Amazons. 
2. Genus : Xeiiarcltus H.-S. 
Xenarckus H.-S. (= Brachycodilla Dyar). Cf. the introduction. 
X. osorius H.-S. (= Aidos castrensis Schs.) (164 b). Forewing similar to amanda, but with a distinct osorius. 
white vertical streak at the angle. Hindwing white, red at the inner margin, with a row of blackish dots at 
the distal margin and blackish fringe. However, there are also the hindwings of which are coloured exactly 
like the 99 (gynomorphous form). The hindwing of the 9 is broader red at the inner margin, brownish else¬ 
where, especially at the angle and costa. South Brazil. 
X. carmen Schs. (164 b). <$. Forewdng with a semicircular row of small black spots beyond the middle, carmen. 
a small white vertical streak at the angle. Hindwing red with a greyish-brown apex and fringe. 9- Forewing 
without the semicircular line of black spots or only with traces of them. Hindwing more extensively red than 
osorius, broadly brown only at the costa, otherwise very similar to osorius. South Brazil. 
X. admirabilis Schs. (164 b). <$. Forewing yellowish white with a red and blackish marking, beneath admirabilis. 
mostly of a bright cerise colour. Hindwing white. 9 unknown. South Brazil, also from Paraguay. 
