Publ 27. I. 1922. 
PAGHYDOTA. By Dr. A. Seitz. 
393 
I. achrosis Dgn. (55 f). Forewings bone-white, at the margins broadly tinged yellow; also the head aehroxU. 
and body pale yellow; above the anal angle of the forewing some small, blackish antemarginal streaks situate 
in a faint subterminal shade. Loja in Ecuador. 
I. obscurata Hmps. (55 g) pale brownish-yellow, forewing dirty ochreous, the marginal part of the obscumta. 
purest tinge. Before the apex at the costa a brown shade; hindwings somewhat diaphanous whitish, at the 
border dark ochreous. Colombia and Peru. 
I. mamona Dgn. (55 h). Yellowish-grey, abdomen darker with a yellow apex. Forewing with a dark mamona. 
dot in the cell and blackish streaks in the spaces between the veins before the margin. Hindwing with a darker 
marginal shade, being broadest at the apex, but not reaching the anal angle. Loja (Ecuador). 
I. nubilosa Dgn. (55 h) is very closely allied to mamona , but it has a black dot also in the cell of nubttom. 
the hindwing. The colour is a more reddish tinge. Likewise from Loja. 
I. discopuncta Hmps. (= tovia Dgn., barbata Drc.) (55 g). Greyish-brown; forewing in the cel \discopunda. 
with lighter stripes, on the median, from the base, a dark, longitudinal, nebulous streak crosses the wing; in 
the internerval spaces brown dots. Hindwing with a brownish border, particularly in the apical part, otherwise 
diaphanous whitish. Bolivia and Peru. 
I. albiceps Dgn. (55 h). Greyish-brown, the forewing covered with dark sepia-brown small streaks, alb heps. 
the hindwing lighter in the disc. Thereby the colouring of numerous other butterflies, such as Opharus, Elysius, 
Pelochyta etc. is produced; but the species is at once discernible from all of them by the head being white above 
and by a white spot on the mesothorax. Colombia, found by Fassl. 
I. lugubris Schs. (55 b,k) greatly resembles albiceps, but the forewing is suffused with a more leaden- lugubris. 
grey tinge, the head above dark brown, not white, and on the thorax no white spot. South Brazil. 
1. tristis Schs. (= dolens Drc.) (55 g). Almost exactly like lugubris, but the tegulae and patagia tristis. 
whitish, the hindwing in the disc of a clearer, lighter tinge, the abdomen with white sides parted by a dark 
longitudinal furrow. Mexico, Central America, Venezuela and South Brazil. 
I. ferrea Dgn. (55 h). Body slender, antennae very long, almost the same as in Opharus. Forewing ferrca. 
light brown, with dark margin and thick, blackish-brown veins; hindwing diaphanous white, at the border 
darker. Colombia, found by Fassl. 
1. mundator Drc. Similarly coloured as tristis, but much larger (66 mm). Recognizable besides by the mandator. 
whitish apices of the patagia; also the abdominal sides are spotted whitish. Costa Rica. 
I. styx Jones (55 h). Considerably smaller than mundator, which it otherwise resembles, but the sfi/.r. 
forewing more umbra-brown, the hindwing not diaphanous white in the disc as in mundator, but a little lighter 
than the border. Trinidad and Santos in South Brazil, rare. 
I. nigridorsata Schs. (55 c). Body yolk-coloured, thorax marked orange, above the middle of the nigridorsa- 
abdomen a broad, blackish saddle-spot. Wings creamy-white with dark veins, the hindwing tinged brownish. 
Peru. 
I. nigrivena Schs. (55 h). Body golden-yellow, wings dark yellow, the forewing in the costal area nigrlvena. 
milky-white; all the veins (except the discocellulars) marked with a thick blackish-brown; also the vein in 
the cell thickly black. The largest species of the genus; in some districts of Bolivia common. 
Note: according to recent investigations by ITampson, Desmotricha uniformity Hmps. also belongs to this genus 
(p. 155, t. 23 e), having hitherto been dealt with as a Svntomid. 
73. Genus: I*achy«Iota Hmps. 
About a dozen forms of a robust, in the $ clumsy structure, being divided into two groups. The first 
only contains 2 species and so exactly approximates Ischnocaffipa nigrivena in the colouring, that it is often 
mistaken or confounded with it in the collections. The second group contains a number of very closely allied 
species. Formerly still more forms were distinguished, but some have been eliminated as synonyms. The 
Pachydota have a strong proboscis, rather short, steeply rising palpi with a rudimentary terminal joint, a very 
broad forehead, doubly combed antennae with rather short teeth, a broad thorax; in tire forewing the 1st and 
2no subcostal vein have a common footstalk. The two groups differ beside the colouring, above all by the 
first group having a round apex of the forewing, whilst the of the 2nd group show the distal margin indented 
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