352 Annals Entomological Society of America [Vol. V, 
deeply incurved, dusky, giving an indistinct lateral stripe. Hypo- 
pygium: (Fig. 1); Sth tergite, (St), moderately long, its caudal margin 
almost straight, its caudal margin very feebly concave medially; 8th 
sternite, (Ss) short and high, only about two-thirds as long as the 7th 
sternite, but very high at its base; viewed from the side, triangular, its 
tip turned dorsad and clothed with long hairs; 9th tergite (9t) broad, 
viewed from above, much broader than the 8th tergite, swollen basally, 
the caudal margin broadly concave, in the middle, feebly convex and 
here with a minute square median notch (Fig. 1,); viewed from the 
side (1) the 9th tergite is truncated at its tip and broadly notched, its 
ventral-caudal margin gently concave; the suture separating the 9th 
tergite and sternite not complete. 9th sternite, viewed from the side 
(1, 9s), its dorsal margin about straight attached to the tergite on its 
cephalic or anterior portion; its caudal margin about straight; along its 
caudal face, an elongate body (y), convex outerly; its ventral margin 
applied to the caudal prolongation of the ventral face of the 9th sternite; 
at its dorsal end it is produced into a fleshy, feebly chitinized body (a), 
densely covered with pale hairs which are longest apically; viewed from 
the side, it is slender with a bump on the middle on its outer face. 
Proximad of this organ, in the notch of the ventral paired organ on the 
9th sternite, is an elongate, slender organ (b) directed dorsad; its base 
is slightly enlarged, its stem very slender with long pale hairs on its 
inner face, these directed toward the median line; the tips of these 
organs are greatly produced on the proximal side, here sub-chitinous, the 
tip chitinized, black. In a position of rest, the inner edge of this organ is 
closely applied to its fellow at the median line; the caudal face of this 
broad expansion is provided with three or four transverse ridges and its 
ventral margin is fringed with long pale hairs; viewed from above this 
organ resembles Fig. 1; the outer tooth most chitinized, black; the 
inner, less chitinized except on its outer margin; recurved at the tip and 
directed cephalo-ventrad. Viewed from beneath, the 9th sternite has 
the caudal margin concave, a pair of elongate median organs directed 
caudad, these organs (c) slender, swollen at their tips, the tips closely 
applied, densely clothed with appressed, pale hairs. 
Holotype, &, Callanga, Peru. (Rec’v’d from Staudinger- 
Bang-Haas). 
Type in author’s collection. 
The specific name is derived from the great Indian nation 
formerly inhabiting Peru. 
Closest related, apparently, to glaphyroptera Phil.; sub- 
andina Phil., and apterogyne Phil., of Chile in the greyish color. 
I have before me specimens of all of the above, excepting 
glaphyroptera, which differs widely from inca in antennal and 
wing characters. 
