68 William T. M. Forbes 



Key to species 



1. Pale yellow (fading to dirty white) 5. thule. 



1. Brown with bronzy iridescence 4. auratus. 



1. Ochre yellow, or brown and gray. 



2. Hind wing salmon, brighter than the yellowish fore wing. 



3. quadriguttatus. 

 2. Hind wing straw yellow, shading into ochreous toward border. 



1. argenteomaculatus $. 

 2. Hind wing mouse gray. 



3. Median dark band not noticeably invading cell M 3 ; postmedial dark 

 band with a clearly marked outer defining line from M t to below Cu 2 

 at least; median and apical dark areas not suffused with yellow- 

 brown; hind wing normally shaded with ochreous at apex; lower 



silvery spot usually enlarged, triangular 1. argenteomaculatus rf. 



3. Median dark band most often with a triangular extension in cell M 3 

 or else not extending below M 3 at all, and usually suffused with yel- 

 low-brown; outer boundary of postmedial band distinct only below 

 M 2 ; hind wing usually with rosy tinge, silver spots subequal or tend- 

 ing to disappear 2. purpurascens. 



1. S. argenteomaculatus Harris. Grayish, with darker brown, pale-edged, con- 

 fused bands, the two principal bands converging from base and apex of costa 

 toward middle of inner margin, with two shorter ones between these, and a 

 dark marginal band. Hind wing mouse gray in male, vellowish in female, 65—100 

 mm (H 41:14). 



Midsummer. Larva in rootstocks of alder. 



Massachusetts to Pennsylvania and Minnesota; probably wider spread, but con- 

 fused with the next two forms. New York: Catskills, Glendale, L. I. 



2. S. purpurascens Packard. Similar to 8. argenteomaculatus except as noted 

 in synopsis. 75-100 mm. 



Var. los Strecker has a single silver spot near base and one or two at end of 

 cell; var. perdita Dyar is without silver (H 41:13). 



This species is confused with the last in records. I have seen it from northern 

 Ontario and Canada. 



3. S. quadriguttatus Grote. Fore wing ochreous, hind wing salmon, markings 

 exactly as in purpurascens, sometimes suffused. Hardly distinct from the last. 



New England to northern Ontario and western New York. Xew York: Lan- 

 caster and Buffalo (YanDuzee), Albany. 



4. S. auratus Grote. Grayish with a rosy tinge; bands yellow -brown, pale-mar- 

 gined, the submarginal and marginal often more or less completely fused, and 

 the basal markings confused and largely fused. Angular, brassy-yellow spots 

 at base, a discal spot, and a series of about three, subterminally. Hind wing 

 mouse gray, tawny at margin. 50 mm. 



July northward; end of June in North Carolina. Very lew specimens known. 

 Quebec; North Carolina. New York: Fentons (Lewis County), Lancaster, 

 Ithaca, McLean. Catskills (Summit). 



5. S. thule Strecker. Pale yellow with obscure markings and a brown patch 

 from base to beyond middle of costa; a couple of silvery points. 



July. Sometimes common where found at all. Larva in roots of willow. 

 Wisconsin; Hudson Bay; Montreal; New York. New York: Waddington. 



2. HEPIALUS Fabricius 



Similar to Sthenopis; antenna full as long as thorax and less moniliform. 



The moths occasionally come to light. The larva? bore in herbaceous plants. 



