244 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



with a blackish transverse line at middle. Thorax with obscure paler 

 and dusky transverse lines, which are rarely well marked and often 

 obsolete. Abdomen of the palest ground color, the dorsal tuftings 

 small. Primaries having a powdery or dusty appearance, more or 

 less strigate and with rivulous dusky lines that obscure all the macu- 

 lation and undoubtedly suggested the name lint osa. None of the 

 lines distinct or black and none of the markings contrasting. Basal 

 area quite usually a little darker than the median space; the basal 

 line geminate, brown, diffuse; t. a. line geminate, brown, sometimes 

 preceded by a paler line or outwardly edged with darker followed by 

 gray scales. The median space is usually a little paler basally; at 

 middle and beyond crossed by two or three dusky shade lines. T. p. 

 line very slender, brown or black not contrasting, outwardly bent 

 over reniform, angularly and usually well indented opposite reni- 

 form, oblique and sinuate from vein 3 to inner margin. 8. t. line 

 brown, a little diffuse, incurved from costa to the interspace between 

 veins 3 and -i, there with a rather well marked outward tooth, below 

 that inwardly oblique and a little sinuate rather than incurved. 

 Beyond this there may be a more or less defined yellow shade line, 

 a dusky band beyond lower half, a dusky outward shade from angle 

 of line to outer margin, or there may be only an obscure strigillation. 

 Very often there is a slight apical shade and in the male there is 

 usually more or less bluish gray in the form of shading or powder- 

 ing. There may or may not be a brown terminal line, with the 

 incisions pale marked and the veins dark tipped. There is usually a 

 dull brown, punctiform orbicular, and the reniform is dark, lunate, 

 more or less edged with yellowish. The secondaries are paler at 

 extreme base, the disc crossed by a series of alternate paler and 

 darker undulating lines, of which either series may be the more 

 prominent. The exterior line is best marked, narrow, black, or edged 

 with black scales, not conspicuous, outwardly followed by a yellow 

 or whitish line. The terminal area is usually more or less blue or 

 violet-gray powdered, tending to form a band in the male, some- 

 times changed to a leaden gray band. Terminal line as in primaries. 

 Beneath yellowish brown, powdery, primaries with a large, second- 

 aries with a small, discal spot, both wings with an irregular extra- 

 median line. 



Expands. 1.32-1.60 inches=33-40 mm. 



Habitat. — Canada to Texas, west to Colorado: Kansas. New Mex- 

 ico, Winnipeg, Manitoba. Dates range from the end of May to 

 August. 



I have a long series of specimens from the various collections, rep- 

 resenting the entire range above given, and some very good local 

 collections, notably one of 24 males and 28 females from Dr. (). S. 

 Westcott, collected near Chicago in May and June. In this series 



