368 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.38. 



Doctor Dyar has described the egg and first two stages of the 

 larva as follows: 



Egg: Elliptical, smoothly and evenly rounded, no perceptible flattening nor 

 truncation; surface smooth, shagreened. Shining sordid olivaceous, under a lens 

 minutely black speckled; size, 0.9 by 0.7 by 0.65 mm. 



Stajje I: Head rounded, bilobed, pale brown, erect, sutures depressed. Body 

 moderately elongate, normal, whitish, marked with irregular green rings from the 

 alimentary canal before eating; a very faint, narrow, brown subdorsal line. Seg- 

 ments annulate: cervical shield small, black; tubercles black, a slight blackening 

 around the hair dots only; seta? stiff, minutely flared at tip. 



Stage II: Face below and epistoma broadly bluish white, edged above with a 

 straight black shade; vertex yellowish, with brown black spots in alternating oblique 

 rows; width, 0.75 nun. Body moderately slender, normal, dark gray, many fine 

 irregular brown lines on a greenish-gray ground; venter darker than dorsum, which 

 is irregularly diluted greenish. Feet concolorous; tubercles round, black; setae 

 pointed, dark. 



In the second stage the larvae began to hibernate and finally died 

 off so that the complete life history was not obtained. 



PERO PEPLARIOIDES Hulst. 



Plate 13, figs. 4 and 5; Plate 15, fig. 2. 



1871. lAzelina hubneraria J Packard, Proc. Bost. Soc. Nat. Hist., vol. 13, p. 386. 

 1881. lAzelina hubnerarw.% Butler, Papilio, vol. I, p. 221. 

 1808. Mnrmarea pcplarioides, IIulst, Can. Ent., vol. 30, p. 218. 

 1902. Miinniiriv occirfcntalis, var. pcplarioides, Hulst, Bull. 52, U. S. Nat. Mus., 

 ]». 343. 



Male. — Expanse, 35 to 38 mm. Head and thorax soft gray with a 

 delicate tinge of purplish. Abdomen gray with a light reddish-brown 

 cast. Antennas pale yellowish with a white mark at the base of each 

 which frequently are connected by a faint whitish line across the 

 superior part of the front. Ground color of wings whitish-gray with 

 or without a faint washing over of yellowish or olivaceous, and more 

 or less sparsely irrorate with blackish. Occasionally the surface of 

 the fore wings is slightly washed over with a warm brown tint, but 

 this, a constant character of the female, is of the rarest occurrence in 

 the male, and is never so marked as in the opposite sex. Inner line 

 of primaries conspicuous from costa to middle of cell as a rather broad 

 brown dash directed outwardly; below this point the line is absent or 

 only vaguely indicated. (Inter line brown, not separated from the 

 median shade, variably sinuous, but usually not very strongly so. 

 Inner area, becoming slightly darker outwardly, continuing darker 

 into median space and becoming very dark umber brown in the outer 

 pot lion of this area. In the costal portion of the discalcell, between 

 the inner line and discal spot, is a yellowish patch usually very con- 

 spicuous and never altogether absent. Outer area composed of the 

 unmodified ground color, or with diverse clouds, more or less intense, 

 but when present always arranged as to leave an irregular whitish 

 line extending through the center of the field. Near the outer margin 



