186 N. C. AGR. EXP. STA. BUL. 239 
Color of crown and anterior half of pronotum dull orange, with a narrow 
round spot at apex and an elongate narrow marking bordering base of crown, 
black; posterior portion of pronotum purple with pale dots and vermicu- 
lations; scutellum concolorous with crown, with a median indistinct dark 
marking. Forewings concolorous with posterior portion of pronotum, but with 
vermiculations larger; membrane including apical cells and apical portions of 
anteapical cells; face concolorous with crown; legs variable in color, from dull 
yellow to dark gray. 
Holotype male, Colombia, 1941 (L. Richter) on indefinite loan to USNM 
from NCS. A good number of specimens have been studied from British and 
French Guiana; Venezuela; several localities in the Amazon Valley; Bahia, 
Parana and Santa Catharina, Brazil; and from Misiones, Argentina. 
A. invenusta, n. sp., is somewhat similar to the female lectotype and only 
known specimen of A. stillifera (Stal), from which the females differ in that the 
posterolateral margins of abdominal sternum VII are slender and angulate in 
invenusta, rounded in stillifera. The museum collections studied contain more 
specimens of invenusta than of any other species of the genus from South 
America. 
Amblyscarta alternata, NEW SPECIES 
FiguRE 140, PAGE 183 
Length of male 10.7-10.8 mm, of female 10.2 mm. Head with median 
length of crown varying from one-third to slightly more than four-tenths inter- 
ocular width and from approximately one-fifth to one-fourth transocular 
width, clypeus slightly convex. Hindleg with femoral setal formula 2:1:1, 
length of first tarsomere slightly greater than combined length of second and 
third tarsomeres. 
Male pygofer moderately produced, posterior margin as in A. tnvenusta, n. 
sp., except that convex portion is more convex and concave portion less 
strongly so than in invenusta, with macrosetae irregularly arranged near and on 
posterior margin and a few located more basad on posterior half of disk. 
Plates extending posteriorly as far as apex of pygofer, each with many macro- 
setae located on lateral margin and a few on ventral surface near lateral 
margin on basal half near midlength. Style in broadest aspect with apex trun- 
cate. Aedeagus not unusually broad in lateral view, dorsoapical margin not 
produced, apex of shaft quadrate in lateral view, shaft in ventral view abrupt- 
ly narrowed in apical third and without apical processes. Female abdominal 
sternum VII with posterior margin trilobate with median lobe broader than 
lateral lobes but scarcely extending farther posteriorly than latter. Other 
structural characters as in A. invenusta, n. sp. 
Color of dorsum orange, a spot at base of crown and another at apex, 
posterior submarginal area of pronotum, and three broad transverse stripes on 
forewings, the most anterior interrupted by scutellum, the remaining two con- 
tinuous across commissural margins of wings in repose, black; face, venter, 
and legs, orange. 
