2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
Venation.—Loxostege aeruginalis: Forewing (fig. 2) with vein 6 
distinctly closer to vein 7 than to middle of cell; veins 8 and 9 long 
stalked, 10 approximate to 8+9 at cell and parallel for almost half 
the length of stem; vein 11 subparallel with 10 to costa; terminus of 
vein la upturned, obsolescent distally or if discernible, forming a 
loop with 1b. Hindwing (fig. 2a) essentially the same as in P. 
pustulalis. 
Phlyctaenodes pustulalis: Forewing (fig. 3) with origin of vein 6 
closer to middle of cell than to vein 7; stalking of veins 8 and 9 much 
shorter than in L. aeruginalis; vein 10 strongly divergent from stalk 
of 8 and 9 a short distance from cell; vein la acutely divergent from 
vein 1b from base and terminating on inner margin of wing. Hind- 
wing (fig. 3a). 
MALE GENITALIA (see figs. 14 and 18 for terminology) —L. aerugi- 
nalis: Harpe with a well-developed, hooklike clasper; transtilla with 
ventrodistal extension conspicuous, narrow and extending to near base 
of anellus. Uncus with apex rounded distally. Gnathos absent. 
Phlyctaenodes pustulalis (fig. 5): Harpe unarmed; transtilla without 
ventrodistal extension. Uncus somewhat bilobed at apex. Gnathos 
well developed. 
This study is based, in part, upon more than 1800 dissections of 
genitalia prepared during the investigation. 
FEMALE GENITALIA (see fig. 7 for terminology)—L. aeruginalis 
(fig. 7): Bursa copulatrix with an accessory pouchlike appendage; 
signum well developed. 
P. pustulalis (fig. 4): Bursa copulatrix simple, without an accessory 
pouchlike appendage; signum absent. 
The Loxostege species helvialis (Walker), mancalis (Lederer), samilalis 
(Guenée), rantalis (Guenée), occidentalis (Packard), and a species 
described as Botys obliteralis Walker and heretofore assigned to 
Loxostege and Phlyctaenodes, are so similar to each other or closely 
related species in color, maculation, and other characters that exam- 
ination of the genitalia is often necessary for reliable identification. 
The delineations were prepared by Mr. A. D. Cushman, scientific 
illustrator, Entomology Research Division, Agric. Res. Serv., U.S. 
Department of Agriculture, and are not drawn to scale. The genitalia 
are in ventral view and those of the males are drawn with one harpe 
omitted and the aedeagus removed. 
All photos of adults, except one, are by J. Scott, staff photographer, — 
U.S. National Museum; figure 146 is used through courtesy of British | 
Museum (Nat. Hist.). Photos are about three times natural size. 
