De. 5 CLARK — NEW AMERICAN SPHINGIDAE 45, 
light brown, shading to white. The hind wing below is white, save for the 
light brown median and marginal bands, which are sometimes vestigial. 
The under side of the abdomen is white, with three yellow spots. 
This is a smaller species than P. florestan, the length of the fore wing in 
this latter species in a measured series being 55-60 mm. in the male, and 
55-70 mm. in the female. At first sight specimens of P. francisc@ have a 
faded appearance, but the examination of a considerable series indicates 
no difference between fresh and old specimens. 
Chlenogramma obscura sp. nov. 
Plate III, figure 1. 
Al. ant. long., 9, 46 mm. AI: ant. lat., 9, 19 mm. Marg. ext., 9, 
25mm. Expanse, ?, 100 mm. 
Habitat— Chaco de Santiago del Estero, Rio Salado, Argentina. Re- 
ceived from Mr. E. Le Moult, Paris. 
Palpi brown, first joint white. Head and thorax brown irrorated with 
white, and with a prominent dark brown collar extending backward along 
the sides of the thorax to the mesonotum, the white tufts of which are 
more conspicuous than in Ch. cinerea. Geminate antemedian band in- 
clined obliquely basad back of M2 instead of being angled outward as in 
cinerea. Abdomen above, much worn, but it appears to be dark brown 
with white seales, and with dark brown side spots. Abdomen below brown 
with darker median spots. Fore tarsus with obviously prolonged spines. 
Fore wing, above: Brown irrorated with white, crossed by black lines 
and bands. Pattern similar to cinerea, but a much darker insect. Differs 
from cinerea as follows. Proximal antemedian line stronger. Interspace 
between both black half-moons at R83 and M1 and the postdiseal line are 
blackish, instead of only in front. Dark area between postdiscal line and 
distal margin extending half-way to hinder angle. 
Hind wing, above: The crenate character of the diseal band is much 
less marked, and disappears costad. Ground tone is light brown, whitish 
toward anal angle. 
Underside: Ground tone of both wings dark brown. In the fore wing 
the discal lines are all obscure, and but slightly crenate. In the hind wing 
the discal band outside the cell is broad and dark, not divided; the second 
band is not crenate. 
