IDALUS. By Dr. A. Seitz. 
I. xanthia Hmps. is smaller, unicolorously orange-yellow, only the 4 last abdominal rings are black xanihia. 
with lustrous blue spots, and the border of the hindwing is slightly brownish above the anale angle. Venezuela. 
—- The species resembles numerous other Arctiids from the same district, such as Automolis bonora sulfurea, 
pauperis (50 h) etc. 
I. flavobrunnea Dgn. resembles xanthia, larger, likewise orange-yellow with a black abdominal apex; jhuubrun- 
but the whole apex of the forewing is here pale red-brown. This colouring extends from the apex of the wing nca - 
almost to the cell-end, and from above the anal angle there runs a thick ray filling up the whole space between 
the median veins as far as the lower cell-wall. Peru. 
I. flavoplaga Schs. (45 c) also approximates by its exterior numerous other Arctiids, such as Automolis /Uimpiaga. 
priscilla, persimilis (51 h) etc. Here the whole forewing is dark brown except a large, costal, yellow' triangle 
and a stripe above the proximal margin. Through the dark ground of the forewing there run lighter veins; 
hindwings pale yolk-coloured. Guiana. 
I. pseudanieoides Rothsch. (45 c). The exterior of the is so very similar to that of Prumala ameoides, 
that the two species might easily be mistaken. The Idalus- species, however, is easily discernible by the scent- 
organ resting on the costal part of the hindwing like a discoid pad. The $ is quite different, the yellow colour 
reduced to central spots in the forewing and to the basal part in the hindwing. Guiana, Amazon, Peru; the 
figured $ originates from the Rio Songo in Bolivia. 
pscuda- 
mcoidf'n 
I. venata Dgn., (= veneta Dgn.) (45 b). Body and forewings dull ochreous-orange, the forewing in venaia. 
the distal half somewhat brownish; hindwings pale yellow, antennae and legs black. The A has on the forewing 
beneath, near the base below the cell, a small round scent-spot. Colombia. 
I. hippia Cr. (= albicollis Wkr., lemba Drc.) (45 d). The proximal half of the forewing is greyish, hippia. 
violettish-brown, the distal half pale yellow' with obsolete guttiform spots. Easily recognizable by the scent- 
organ of the exhibiting on the forewing beneath a chalky, round felt-spot with a shiny border, and on the 
hindwing above a similar scent-spot occupying almost the whole costal part of the hindwing. In the $ the 
middle of the forewing is crossed by a yellow macular band bordered with red, and the hindwings are dark 
red. From Panama to Central Brazil; particularly in Costa Rica, on the Volcano Irazu. 
I. albicoxae Schs. Rather similar to hippia, but the colours are brighter, the proximal half more albicoxae. 
distinctly marked purple, the distal half of a bright yellow. Easily discernible by the scent-spot being so much 
smaller than in hippia, that it by far does not distort the hindwing so much. Guiana. 
n c- 
pasta. 
I. melanopasta Dgn. (45 g). Scheme of markings similar to the preceding, but the dark part of the mcla 
forewing is expanded so far towards the margin, that there remains only a yellow marginal band of 2 or 3 mm 
width, being above and below pointed and above the middle of the border indented. Besides the dark part of 
the forewing is intermixed with black dots and small streak-spots and purple inter,spersions. Hindwing with 
a dark scent-spot in the dull yellow costal half, anal half pink. Guiana, also in East Colombia. 
I. lineatus Drc. (45 d) has entirely the shape of an Automolis or Evvus and was also described as the lincatus. 
latter. Body pale yellow, marked red, thorax with distinct black dorsal dots. Forewings dirty yellowish-grey, 
towards the base darker and tinged yellowish, with numerous internerval streaks; hindwings pale reddish-yellow. 
Panama. 
I. agricus Dyar (45 d). This animal discovered by Robert Muller near Misantla in Mexico initiates agricus. 
a series of species copying the colouring of Automolis herois (50 k) which likewise flies near Misantla. Through 
the pale-yellow forewings being centrally more strongly tinted orange, there extends a somewhat curved trans¬ 
verse band composed of brown longitudinal spots (above and below) or transverse spots (in the middle, round 
the cell-end). Base of the wing with a violettish-brown basal spot formed of thick internerval streaks. Hindwings 
whitish, abdomen red. Apparently rare or difficult to discover from among the number of similar Automolis. 
I. agastus Dyar. Like agricus resembles Automolis herois, agastus is like Automolis pichesensis (52 a) agastus. 
to such an extent that it is difficult to discern. The type of marking is that of agricus-, body white with a dark 
red marking. The main difference from Automolis pichesensis is, beside the more slender structure of the latter, 
that in I. agastus the dark streaked basal spot forms a strong contrast with the disc of the forewing, in a projec¬ 
ting angle, similarly as in the smaller /. agricus (45 d), whilst its distal margin in A. pichesensis runs 
from the base of the costa obliquely downward and outward, towards the middle of the proximal margin. Peru. 
I. admirabilis Cr. Forewing almost exactly like in agastus, and like the latter very similar to Automolis admirabilis. 
critheis (50 k), but easily discernible from agastus by the crimson hindwing being only whitish at the margin. 
Also the abdomen is above red except the white apex. Panama to Central Brazil. 
I. albidior Rothsch. (45 d) is to be distinguished from the preceding by the purely white distal part albidiur. 
of the forewing, by the uniform, little curved median band, and by the basal spot being replaced by a dark 
