760 
HYLESIA. By Dr. M. Dratjdt. 
liturex. 
coc.v. 
rex. 
nigricans. 
paulex. 
biolleya. 
mortifex. 
lolamex. 
molpex. 
munonia. 
H. liturex Dyar (114 a). Near livex, smaller and much less contrasting, the postmedian line hazily 
passing over into the lighter subterminal shadow. Lines of hindwing relatively distant from each other, the 
distal one nearer to the margin. Guiana, Amazons. 
H. coex Dyar (114 a). Thorax brownish-grey, abdomen with ochreous hair. Forewing lilac grey, basad 
irregularly shaded darker; a small discal spot in the cell and a larger one at the end; the broad distal transverse 
line straight, shaded as far as the subterminal line. Hindwing instead of the discal spot with the interior line 
through the cell-end, the exterior line feeble, irregularly shaded. A small species from Venezuela (Aroa, Orinnoo), 
the figured p' smaller than the type. 
H. rex Dyar (114 b) differs from coex in its larger size , the more falciform apex of the forewing and 
darker colouring; the small interior cellular spot is absent, the distal line broader, the following shadow feeble. 
Hindwing likewise darker, the lines feeble, the exterior one more broadly shaded, the marginal area behind 
not lighter. Guiana, Amazons. 
H, nigricans Berg (114 b) is a somewhat variable species. Thorax dark ash-grey, abdomen ochreous. 
Forewing varying between lilac grey and brownish, as far as the distal transverse line mostly feebly darker, 
the two transverse lines blackish, the interior one mostly obsolete, incurved below the cell, the exterior one fine, 
very feebly curved; discal spot large, blackish, often touching the postmedian line; subterminal shadow feeble, 
of the usual shape, before it at the costal margin a small more or less light triangular spot, behind it in the 
upper half the usual marginal shadow. Hindwing sometimes darkened blackish as far as the exterior line, 
mostly only at the inner margin feebly darker, the two transverse lines distinct, the interior one beneath 
straight and stronger than the exterior one. The $ is dark violettish-grey or blackish-grey, the lines and discal 
spot broadly shaded with black. Abdomen black, beneath, laterally and at the end densely covered with rusty 
yellow hair. Southern Brazil; Argentina, Paraguay, Patagonia. The larva is yellow, laterally spotted black, 
with a black head and long ramified thorns ending on the 3 first rings with black hairs. It lives on Camphoromaea 
laxa and many other trees and shrubs. Mr. Kohler in Buenos Ayres writes me about it besides: nigricans is 
officially declared a vermin in the Province of Buenos Ayres and often strips wide stretches of willows and 
other plantations. The larva burns vehemently with its burning hairs. It lives together in nests and only 
separates shortly before the pupation. Few years ago the insects were in such immense numbers in the willow- 
plantations near the C ity that the droppings were to be heard drizzling to the ground like rain. Mr. Kohler 
took there also 2 incomplete hybrids being male in general, but darker, with a female black abdomen and little 
anal wool. 
H. paulex Dogn. (114 b) is allied to nigricans ; somewhat larger, the front body dark brown, abdomen 
ochreous. Forewing drab with a brownish tint, slightly strewn with white, the transverse lines on the averted 
sides feebly lighter or whitish, like the subterminal shadow on its outside; discal spot rather large and distinct. 
Hindwing with a somewhat more blackish tint, the cellular spot and both the distal lines feebly marked. S. Paulo. 
H. biolleya 8chs. (114 b) is more sooty blackish-brown than the preceding species, basally still darker, 
the anterior transverse line lighter, the posterior line fine dark, outside likewise light-edged, the discal spot 
quite obsolete, but large; subterminal line as in paulex. Hindwing sooty brownish with but one shadowy indis¬ 
tinct postmedian line. Abdomen orange brownish. Costa Pvica; Brazil (?). 
H. mortifex Dyar. Thorax deep brown, abdomen vdth ochreous hair and somewhat darker bands. 
Forewing slightly falcate, lilac grey, densely shaded with dark grey, costal margin in the median area dusted 
whitish, discal spot large, faded; postmedian line fine, very feebly incurved, subterminal shadow as usual. 
Hind wing with 2 shadowy lines, the exterior one undulate towards the margin. Expanse of wings; 35 mm. 
Venezuela. 
H. lolamex Dyar (114 b) resembles nigricans, but the forewing is more falcate, the discad spot larger, 
browner and faded, the distal transverse line browner and straighter, gradually vanishing in the brown sub¬ 
terminal shadow. Hindwing above with 2 curved feeble shadowy lines, beneath with 2 feeble curved, distantly 
separated bands, the interior one not straight and stronger than in nigricans. Venezuela. 
H, molpex Dyar, according to the description, looks exactly like rex and is perhaps a form of it; on 
the hindwing the interior line is situate close behind the feebly visible discal spot. Expanse of wings: 35 mm. 
French Guiana. 
H. munonia Schs. Body dark greyish-brown, abdomen cinnamon-reddish. Forewing reddish claret- 
coloured greyish-brown with a broad lighter subterminal shadow reaching the margin below 4; costal margin 
before the centre with white hairs, antemedian line light reddish-yellow, irregularly interrupted, the posterior 
line feebly incurved, brown, distaliy bordered with olive reddish, proximad with a lighter reddish claret-colour. 
Hindwing at the costal and distal margins light brownish, in the disc reddish yellowish-brown, thickly clad 
with dark claret-coloured hair; at the cross-vein a dark double line, behind it the dark postmedian line and a 
dark subterminal shadow. Expanse of wings: 40 mm. S. Paulo (Brazil). 
