1080 
TROSIA. By Walter Hopp. 
caramia. 
pulchella. 
placida. 
acca-acca. 
ribbei. 
aterrima. 
ochracea. 
rufa. 
rubrivena. 
pellucida. 
Guiana. The type of ferugina shows a pink thorax with a magnificent gloss, whereas otherwise the thorax 
mostly exhibits only smaller pink or white spots. — caramia Dyar (160 d), from Peru, is an orange-red variety 
which, however, forms transitions to revocans everywhere on the Amazons. In all kinds of colourings revocans 
is distributed from Peru down the Amazons to Para, in Guiana, Paraguay, Minas Geraes, and South Brazil. 
T. pulchella Schs. (160 d) is very closely allied to revocans and likewise variable in the colouring. It 
is recognizable by 1 or 2 small black longitudinal streaks in the anterior part of the cell of the forewing. Be¬ 
sides it is still more variable in colours than revocans. Purely yellow specimens from Peru pass over to dark 
grey ones on the Amazons, and the grey colouring may also extend to the abdomen. The yellow colouring 
may change to deep orange-red, the pink parts of the thorax may also pass over to the wings, and the wing- 
contours vary so much that the forms become quite similar to dimas Cr. The species is absent in South Brazil. 
T. placida Jones (160 c), however, is almost constant in its colouring and marking; its range seems 
to be confined to the Corcovado and Itatiaya near Rio de Janeiro. Vertex of the head, femora and thorax 
orange, the latter with a pink or white belt-zone, the costa of the forewing, the abdomen, tibiae and tarsi are 
deep black, the tarsi pointed with white hairs. Forewing broadly edged with yellow snbcostally and on the 
long inner margin, otherwise greyish-black like the hindwing. A narrow orange belt near the base of the ab¬ 
domen. 
3. Mcca-group. 
T. acca Schaus (160e) with its geographical races is distinctly defined from all the species by the harpes 
of the male sexual armature exhibiting near the apex a broad short lateral excrescence which is absent in the 
other species of Trosia. In — acca-acca Schs. the abdomen and hindwings are yellowish ochreous, the blurred 
dark transverse band of the forewing is more distinctly marked, in — ribbei Drc. (160 e) the abdomen and hind¬ 
wing are reddish ochreous, the transverse band of the forewing indistinct or absent. These differences occur 
in both genera, acca-acca is known from South Brazil (Espiritu Santo to Santa Catharina) and Paraguay; 
electra Hopp, from Paraguay, founded upon small differences in the shape of the sacculi, is synonymous, as 
these differences are not constant; ribbei is widely distributed, in Bahia, on the Amazons as far as Peru, Guiana, 
Venezuela, Colombia, Panama to Mexico. Transitions of the two races are found on the eastern slopes of the 
Andes in Colombia, Ecuador, Peru, and Bolivia. The brightest red specimens of ribbei became known from 
Costa Rica, while specimens from Mexico, Guiana and Bahia are again more yellowish ochreous. Another race 
aterrima Hopp (160 e) is a descendant of ribbei owing to the reddish ochreous head, thorax and femora, with 
blackish-grey to deep black tibiae, tarsi, wings and abdomen a product of the intensely rainy forests on the 
western coast of Colombia. 
The following species exhibit normal branchless harpes. They resemble acca only in their colouring. 
T. ochracea Hopp (160 e) is very similar to acca. Only the type from Rio de Janeiro is at hand. Fore¬ 
wing and thorax are lighter and more grey, hindwing and abdomen more yellowish ochreous, the hair smoother, 
longer and more scanty. 
The two following species represent transitions from acca to the dimas-growp in their colouring and 
marking. 
T. rufa Jones (160 e). Both sexes with rather dark brown, thinly scaled forewings exhibiting a reddish 
shine produced by single red hairs. The wing is crossed, from the costa to the inner margin, by a band ofblack, 
thinly scaled spots which spread widely on the costal half of the wing and become indistinct thereby. Head 
brown, frons red. Thorax brown, abdomen red, anus light brown. Anterior legs with short black hair on one 
side, with long red hair on the other side, the other legs red and light brown. South-Eastern Brazil: Alto da 
Serra (Sao Paulo), Corcovada and Itatiaya near Rio de Janeiro. 
T. rubrivena Jones (160f) has almost the reverse colouring: forewing red, thinly scaled, with alight 
brown shine produced by brown hairs. The transverse band of black spots through the wing as in rufa. Head 
red, frons brown or red. Hindwing reddish, likewise thinly scaled Thorax red, suffused with light brown. Ab¬ 
domen red. Legs red or partly light brown. Brazil: Castro (Parana) and Matto-Grosso. 
T. pellucida Mschlr. (Chrysopyga) (= [Thoscora] brugea Schs., [Podalia] darca Dyar) (160 f) is a species 
that has frequently been misinterpreted owing to the original description of the $. The <$ has dark brown 
forewings which are densely scaled and show somewhat darker veins. Hindwing somewhat lighter, with a 
streak of dark hair near the anal margin. Thorax dark brown above, ochreous beneath like the head, legs and 
anus. The abdomen has double hair, the lower being dark brown, the upper ochreous. The 9 is more thinly 
scaled on the wings, but of the same colouring. Guiana, Venezuela, Colombia (Eastern Cordilleras and western 
coast). 
