472 WILLIAM T. M. FORBES 



6. Median fascia markedly paler dull brown toward dorsal margin, 

 . the markings edged or suffused with wood-brown (larva on Com- 



positse, etc. ) 2. slingerlandana, 3. ambrosiana. 



6. Median fascia evenly black-brown, the markings very narrowly 

 and incompletely pale-edged (larva on Rosaceae) 



6. spir&ifoliana. 



Polychrosis has also been bred from clematis, Kalmia, Amorpha, raspberry, sassa- 

 fras, rose, Circium, and Monotropa. Some of these records are doubtless of stray 

 larvae, but some may represent new species or strains. 



1. P. yaracana Kearfott. Ground blue-gray; markings blackish, broadly edged 

 with white; basal third largely blackish. Costal part of median fascia nearly 

 black, contrasting, followed by a darker blue-gray area toward costa, forming a 

 patch visible to the naked eye; dorsal part of fascia obliterated by a white spot. 

 Hind wing white, the fuscous apical shade only reaching half way to cell. 9 mm. 



May and June. Larva unknown. 



New York to Cincinnati, Ohio. New York: Gowanda. 



2. P. slingerlandana Kearfott. Shining dark blue-gray; markings black-brown, 

 heavily edged with wood-brown, and more or less suffused with the same wood- 

 brown, especially on outer two-thirds of dorsal half. Base markedly grayer, but 

 still heavily marked. Apical spot blackish, fringe dark gray; hind wing blackish, 

 with dark fringe. 9 mm. 



Larva on Eupatorium, working especially in flowers and seed. 

 New Jersey, etc. 



3. P. ambrosiana Kearfott. Dark blue-gray, marked with blackish; the marks 

 finely pale-edged, but antemedial space not contrastingly pale; base less darkened 

 than in P. carduana. Markings normal, subterminal patch well set back from the 

 outer margin, which bears a strong blackish streak, usually joined at one point 

 to the subterminal patch; postmedial costal patch normally broken into a couple 

 of oblique striae. 9 mm. (vernoniana Kearfott). 



Larva in flowers and seeds of Ambrosia trifida, and on Vernonia. 

 New Hampshire to District of Columbia, and west to Kansas. 



4. P. carduana Busck. Dark blue or purple-gray; markings normal, black-brown, 

 finely pale-edged, with a well-marked postmedial costal patch. Base almost solidly 

 blackish, contrasting with the antemedial area, which is light clay-color on the 

 dorsal half; median band a little paler toward inner margin and of moderate 

 width; subterminal patch large and dark; fringes and hind wing dark gray. 

 9-12 mm. 



Larva in the heads of thistle; semisocial. 

 Maryland; Normal, Illinois. 



5. P. aruncana Kearfott. Dark blue-gray, marked with dark brown, the markings 

 mostly normal and finely pale-edged. Base dominantly blue-gray, but with a broad 

 antemedial fascia. Median fascia broad and light wood-brown to ochreous on dorsal 

 half; more than a fourth as broad as wing at dorsal margin. Postmedial patch 

 broken into striae; brown. Fringe and hind wing dark gray. 7 mm. (Specimens 

 perhaps dwarfed by breeding.) 



Larva on Aruncus (Spiraea). 

 Maryland. 



6. P. spiraeifoliana Heinrich (Kearfott ms.). Larva on Spiraea salicifolia. Mark- 

 ings normal, black-brown on a dark blue-gray ground, with only slight traces of 

 pale edging. Terminal fascia heavy. Median fascia wholly black-brown, the tooth 

 not very strong; subterminal patch very high, joining one of the black-brown costal 

 striae (which are all thick bars) and reaching nearly or quite to anal angle. 

 Fringe and hind wing dark. 9 mm. 



May ; August. 



New Hampshire to Pennsylvania. 



