THE CACTUS-FEEDING PHYCITINAE HEINRICH 383 



I. SIGELGAITA CHILENSIS. new species 



Plates 31, 42, 50 : Figukes 28-28c, 70-70a, 125-125a, 126 



Male, — Palpus, head, and thorax fuscous, strongly irrorated with 

 white ; head and collar more whitish than fuscous ; posterior margin 

 of thorax shaded with black. Fore wing fuscous, dusted with white, 

 giving the wing an ashy-gray (in some specimens a bluish-gray) 

 color ; a white suffusion filling the cell ; antemedial line near middle 

 of wing, black, outwardly angulate; from upper angle of cell to 

 middle of inner margin a more or less prominent blackish shade; 

 subterminal band dentate, consisting of a thin, black, inner line, a 

 parallel outer black line, and a central pale line, the dentations of the 

 outer line acute and extended in short dashes onto the veins ; a row of 

 black dots along termen between the vein ends. Hind wing whitish, 

 smokj^- fuscous toward termen, apex, and costa, and on the veins; 

 cilia white with a pale- fuscous subbasal line. 



Alar expanse, 31-42 mm. 



Genitalia (figs. 28-28c) with harpe fairly broad, aedeagus some- 

 what stouter than in transilis^ vinculum shorter. 



Female. — Pattern and color as in the male except smoky-fuscous 

 shading on hind wing somewhat more extended. 



Alar expanse, 38-44 mm. 



Female genitalia (figs. 70-70a) with signum present, the latter con- 

 sisting of three or four minute, more or less coalesced, blunt spines. 



Type and paratypes. — U.S.N.M. no. 52751. Paratypes also sent to 

 Mr. Dodd. 



Type locality. — Ovalle, Chile. 



Food plants. — Eulychnia acida Philippi, Trichocereus chiloensis 

 (CoUa). 



Remarks. — Described from male type and two male and four female 

 paratypes from the type locality, reared March 7, 9, 10, and 11, 1937, 

 from larvae feeding in fruits of Eulychnia acida; and two male and 

 four female paratypes from La Serena, Chile, reared January 6, 12, 

 13, 1937, from larvae feeding in fruits of Trichocereus chiloensis. 



Superficially this species and huanucensis resemble Nanaia substi- 

 tuta. The latter, however, lacks altogether the dark shade between the 

 outer angle of the cell and the inner margin so characteristic of 

 chilensis and huanucensis. The fore wings of the three species are 

 similar, long and narrow and of about the same size and shape. 



2. SIGELGAITA HUANUCENSIS, new species 

 Plate 42; Figuees 71-71a 



il/aZe.— Similar to that of chilensis, except as follows : Paler, white 

 dusting on head, thorax, and fore wing more pronounced; general 



