Publ . 17 . X . 1931 . 
TROSIA. By Walter Hopp. 
1081 
T. brugea Schs. (Thoscora) (160 1) which has been placed as a synonym to pellucida must probably be brugea. 
regarded as a distinct species. Both the sexes differ from ■pellucida in longer, uniformly ochreous hair on the 
abdomen, the also in ochreous hair on the anal margin of the hindwing. Venezuela, Guiana, Para. 
T. xinga Dogn. (described as Podalia), from the Rio Xingu (Amazons), which I only know from the xinga. 
description, has pale blackish-brown wings and fringes, the abdominal margin of the hindwing is covered with 
long reddish hair like the abdomen. The latter, the head, and the coxes (presumably the femora) are reddish, 
the tarsi of the first pair of legs covered with long blackish hair. Thorax slightly brownish. 
T. zikani Hopp (160 1), from Minas Geraes (Brazil), is allied to this species and may be only a differ- zikdni . 
ently coloured form of it with light grey scales which are more intensely brown only on the base of the wing, 
the costa of the forewing and on the veins. Head orange-brown, thorax dark brown, abdomen intensely orange- 
red, with a yellow anus. Hindwing with orange-red hair at the anal margin. Femora orange-red, tibiae vellowish- 
grey, tarsi brown. The orange-red colouring is replaced by ochre in some specimens. 
T. omayena Schs. (1601), described as Gerontia, but placed to Podalia by Dyar, in fact looks like a omayena . 
Podalia, especially since it is the only Trosia exhibiting white antennal shafts. Yet it undoubtedly belongs to 
Trosia owing to the 10th ventral segment of the Head, thorax, and forewing pale greyish-brown, the fore¬ 
wing with prominently dark veins. Abdomen and hindwing, as well as the thorax beneath and the femora 
are more yellowish-brown, especially at the anal margin of the hindwing. In the $ the thorax and the hair 
of the legs are partly more dark brown, but partly also nearly whitish. British and Dutch Guiana. 
4. Dimas-punctigera Group. 
T. dimas Cr. (= tricolora Fabr.) (160 f). dimas and punctigera exhibit the transverse row of spots 
on the forewing, traces of which were already discernible in rufa and rubrivena. They are two common closely 
allied species of almost the same wide range: Mexico to South Brazil, dirnas is generally the smaller species; 
the S has broader shorter forewings, a more narrowly coloured costa, longer looser hair, a shorter and broader 
uncus, punctigera-<$ has an expanse varying between 40 and 27 mm, dimas-$ between 39 and 20 mm. One 
of the most distinct differences is the number of the spots of the transverse band through the forewing: 8 in 
dimas, 7 in punctigera which almost invariably lacks the costal spot owing to the broader red costa. 
T. dimas Cr. Cramer's figure of it is a failure, the habitat stated to be the “West Indies” is doubtful, dimas . 
as the species occurs in Trinidad, but not in the West Indies. The usual colouring is: head and its surroundings 
red or mixed with white, thorax white, with 6 red spots, abdomen red, beneath and at the anus white, femora 
red, beneath white, tibiae and tarsi black, interrupted by white, the tibiae with longer hair. Forewing white, 
or feebly pink owing to the under surface showing through, costa red or orange, the transverse row of spots 
black, under surface red or partly white; hinclwing above and beneath red with white fringe. Besides this most 
common colouring there occur all kinds of chromatic deviations excepting the tibiae and tarsi which seem to 
be invariably black and white. The other parts of the body vary in red, yellow, white, and brown colours, and 
the red colour may vary from an intense carmine to a pale pink and may also pass over into yellowish-red tints; 
yellow occurs in all stages between dark ochre and white. The chief colourings are: thorax white, yellow, red, 
brown, thoracal spots red, yellow, white, forewing above white, yellow, brown, red, costa of forewing red, white, 
yellow, forewing beneath red, red partly with white or yellow, entirely white or yellow, abdomen red, yellow, 
white. The fringes of the wings are sometimes also partly of different colours: red, black, yellow, white. Femora 
red, yellow, or white. When combining only the more common ones of these colourings we discover more than 
486 differently coloured forms, of which surely a great part occurs in nature. Besides, however, there are also 
varieties in the marking. Thus the forewing sometimes exhibit longitudinal rays of other colours such as white, 
brown, yellow, and a smoky brown coat which is narrow in the basal area and extends over a more or less great 
part of the forewing. Such forms may be called —- fumosa (160 f); Zikan collected of a fumosa- form quite a jumosa . 
number of transitions to the normal form, occurring from a slight smoky brown tinge to entirely dark brown 
forewings and to a dark brown instead of red thorax. Other similar forms of jumosa are also known from Costa 
Rica, Colombia, Peru, and Bolivia, they occur also on a yellowish ground-colour of the forewing. The trans¬ 
verse band of black spots through the forewing is also variable. It is elongate, curved once or twice, single 
or all the spots widened or strigiform; Mexican specimens showed also much smaller spots. — Only few of these 
many varieties, and by no means the extremest colourings, have been denominated. One may, however, use 
the existing names in order to classify the variations at least to some extent: — flava-forms (flava Dogn., in- fiava . 
costata Schs. [160 f], tolimata Dogn. [160 f], misda Dyar, amarilla Hopp [160 f], — albida-forms (albida Dogn. albida . 
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