360 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
the escape of the larva} from the trees and before the moths emerge, ox 
not far from the 8th of October at this place (Washington, D. C). 
Larva.— Length, i:i ,l,m . General color, reddish straw yellow. Head, light-brown- 
i.sli ; tipfl of mandibles and a .small spot about the eyes, blackish ; thoracic and anal 
plates, light honey yellow. The piliferous tubercles on the dorsum are greatly 
expanded laterally, so as to give them an elliptical form ; the anterior pair on both 
the third and fourth segments are so expanded that the distance between them is 
only equal to their length, the posterior pair on these segments nearly or quite oblit- 
erated. Anterior warts of the fifth to the eleventh, inclusive, more rounded and 
brought close together at the dorsal line; those of the posterior side of these seg- 
ments fusiform, the length quite equal to four times the thickness, and separated 
from each other by a small space on the first of these segments, but approaching more 
and more, they touch each other on the dorsum of the more posterior ones. The dorsal 
tubercles of the twelfth segment are so fused together as to appear like two transverse 
elevated bars. The remaining warts of the body are as usual, but considerably 
enlarged, and each surmounted by a tine yellowish bristle. 
Pup a. — Length, 10 mm . Color, yellowish-brown. Abdominal segments ou the dorsal 
side armed on each edge with the usual row of spines. Anterior end rounded and 
smooth, posterior end bluntly rounded, with a row of spines like the larger ones on 
the segments before, extending two-thirds the way around. 
Moth. — Of a dark ashy brown color on the fore- wings, with a large patch of a dull 
piukish-wbite color on the outer part, with several small black spots near the middle 
of this patch. Hind wings a little lighter than the basal portion of the fore- wings. 
Expanse, Id to 20 nun (about .75 inch). (Comstock.) 
3. Sciapteron robmkB Hy. Edwards. 
This ^Egerian is extremely destructive in California and Nevada to 
the white poplar (Populus alba) and to the downy poplar (Populus can- 
escens), both of these species having been introduced into the Pacific 
States as ornamental trees. A small avenue of the latter at San Leau- 
dro, near San Francisco, was utterly destroyed by the Sciapteron, the 
pupa cases being found stickiug out of the holes by hundreds. The 
perfect insect was rather scarce, as it emerges very early in the morn- 
ing, and takes flight with the first gleam of sunshine. Sciap. robin iw 
also destroys the locust trees (Robinia pseudacacia), a grove of this 
species in Napa County beiug observed by me in a state bordering 
upon destruction from the attacks of this insect.. (H. Edwards.) 
Moth. — Upper side: Fore-wings opaque as in all of the genus, rich golden brown. 
They are slightly darker along the costa, and have a faint purple retiectiou toward 
the apex. Hind wings diaphanous, brightly opalescent, with a faint golden brown 
longitudinal streak at posterior extremity of the cell. Costal edge pale yellow. 
Fringe golden brown, pale yellow at the base. Head golden yellow, as are the palpi 
except at the base, where they are brownish. Thorax brown on the disk, golden 
yellow in front and behiud. Abdomen next the three basal segments blackish 
brown, the second aud third edged with yellow. The posterior segments are all 
bright golden yellow, with the anal tuft a little darker. Under side: Fore- wings 
golden orange, with a faint lemon yellow discal spot. Hind wings same as the upper. 
Tarsi and tibia golden yellow, blackish at their base. Antenna red brown above, 
golden yellow beneath. Expanse of wings 1.35 inches. (Edwards.) 
