246 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



little outward to the costa. The triangular area thus inclosed is often 

 darker than the rest of the wing and forms its most conspicuous fea- 

 ture. There is a tendency to a dusky shade band beyond the s. t. 

 line, and the terminal area becomes more gray, forming the palest 

 portion of the wing. There is a narrow brown terminal line followed 

 by a yellow line at base of fringes, and from the terminal line a series 

 of rays extend into the interspaces, giving the whole a crenulated 

 appearance that intensifies the denticulate appearance of the outer 

 margin. Secondaries a little paler and less powdery; three vague 

 dusky shade lines crossing the disk before the conspicuous black 

 extra-median line, which is usually not extended above vein 6. Ter- 

 minal area concolorous, the terminal brown line and pale line at base 

 of fringes being as a rule continued from primaries. Beneath pale 

 yellowish brown, powdery, without obvious markings in most cases; 

 sometimes with a discal spot, rarely with transverse lines. 



Expands, 1.60-1.92 inches=40-48 mm. 



Habitat. — Canada to the District of Columbia, April and May. 



A series of 8 males and 15 females is at hand representing, as 

 actual points of capture, New Hampshire, Webster, May 12-16 ; New 

 York, Center, May 12-17; Long Island, May 14; New Jersey, no 

 specific localities nor dates; AVashington, District of Columbia, April 

 15-22; Iowa, May 1) and 22, no specific locality. There is, on the 

 whole, little variation; some specimens are darker than others and 

 some are much more powdery, one Iowa example becoming almost 

 steel gray to the terminal space. There is more or less contrast in 

 the basal space and the costal area between the t. p. and s. t. lines 

 is sometimes conspicuously the darkest part of the wing. 



The species is one of the most characteristic of our fauna; the 

 unusually elevated or alate patagia, the strongly dentate outer mar- 

 gins, and the conjoint t. p. and s. t. lines form a combination that 

 seems unmistakable. 



In the male the femoral tufting on the middle leg is not conspicu- 

 ous; but the femur is excavated, there is a fringing on both sides, 

 and then' is a mass of specialized scales. As a whole the legs are 

 stout, the spines of the median pair being long and arranged in a 

 series along the sides. 



The sexual parts of the male are symmetrical or nearly so. The 

 uncus is slender and has a long drawn-out, curved point. The lateral 

 pieces are slender, hooked like the uncus itself, and somewhat dilated 

 toward the tip. The penis sheath is almost semicircular in outline. 

 The anal plates of the female are nearly symmetrical, the opening to 

 the eopulatory pouch from the upper inner angle of the right half as 

 seen from below, hut from the upper margin itself. 



The species does not seem to he abundant anywhere. 



