NYMPHALINAE: rOLYGOXIA SATYRUS. 347 



male was found hv W. W. Hill at Fentons, Lewis Co., N. Y. in Auo-ust 

 187(>. No additional captures have been reported within the last ten 

 years. Doubtless it must occur in much of the intervening region, prob- 

 ably along the north sliore of Lake Superior and the southern boundary of 

 the Dominion of Canada. 



Its discovery by Mr. Pearson is the only warrant for its introduction at 

 this place. It will probably be found within the territorial limits of New 

 England. 



Food plant. The cateri)illar feeds on the stinging nettle, on which it 

 has been found both on the Pacific coast (Stretch, H. Edwards) and in 

 Canada (Pearson). Mr. W. H. Edwards writes that it has also been 

 taken on Azalea. Mr. Edwards has shown me a drawing by Mr. Barus 

 indicating that the caterpillar draws the leaves of nettle together as 

 P. comma does, and probably by the same methods. 



History, etc The data foi- any history of this insect are very meagre. 

 \\'c only know that the caterpillar is to be found in June, the butterflv in 

 July, and that the chrysalis state lasts at this season about a fortnio-ht, the 

 caterpillars reared by Mr. H. Edwards on the Pacific coast changing to 

 chrysalids between June 20 and 26, and emerging July 4-18 ; while the 

 caterpillars obtained by Mr. Pearson near Montreal, chano-ed July 1, and 

 the butterflies emerged July 18-15. The only dates of capture of the 

 butterfly are April 2 in California (Osten Sacken), June 24 in Colorado 

 (Mead), July 9 and 21 in Utah (Putnam, Packard), July 22 in Ontario 

 (Mead) and August 1 in New York (Hill). Whether the insect is single 

 or double brooded is therefore altogether uncertain, the absence of dates of 

 a second brood in no way disproving it, since the butterfly must certainly be 

 on the wing at the season at which a second brood should appear. The 

 butterfly undoubtedly hibernates, as Osten Sacken 's capture shows. The 

 dimorphism of the species was suggested by me as "very likelv" in 187,5, 

 and proven by the breeding experiments of ]Mr. O. T. Baron of California 

 (Edw. Butt. N. A., ii, Grapta 3 p. [4]). Mr. Edwards had urged 

 against it that the two foinns did not fly over the same territory, and indeed 

 until now P. s. marsyas is known only from the Pacific coast. No account 

 has therefore been given of it here, as it is not impossible that it is con- 

 fined to that region. The butterfly flies in company with its congeners, 

 in the west with silenus, in the east with progne and faunus. The only 

 notice of its flight is by Mr, Mead, who says his Ontario specimens were 

 taken at a patch of milk-weed, and that after the first was secured the 

 other was very wild, "frequently flying far into the woods, and then after 

 a few moments returning to the patch of milk-weeds." 



Pteromalus puparum (89: 1, 2.) has been raised from this insect, accord- 

 ino- to Mr. W. H. Edwards. 



Desiderata. In New England searcli should be made for this buttei-fly 



