THE SPREAD OF A BUTTERFLY IN A NEW REGION. 1181 



Scholiarie, an intcrniftliato point thirty miles west, I did not detect it 

 until perhaps two weeks later." As it is not rej)orted from the eastern 

 end ot" Lake Ontario for a year or two. tlie ImttorHv prol)al)ly readied 

 Utica bv the eastern side of the Adirondack rcuion, tu do whieli it 

 must have spread more rapidly in a western than in a southern 

 direction from tiie southern end of Lake Chaniplain. Moreover, Mr. 

 Hawkins tells* me that it appeared this same year in Oneonta, Otsej^o 

 Co.. considcrahly to the soutli and cast of Utica. Along the Hudson, 

 Mr. Lintner does not report it as extending farther south than Bath, five 

 miles Ih'Iow Albany, in September. There can be' no doubt that it had 

 this year completely overrun Vermont and New Hampshire, though the 

 only records I have in the southern portions are that the first specimens 

 were taken by ^Ir. C. P. Whitney at Milford, N. IL, on May 26 of this 

 year, that it was abundant there by autumn, and taken in numbers at 

 AValpole, N. H., in June. But it had followed down the Connecticut 

 valley much farther than this, for it was taken at Holyoke, Mass., by Mr. 

 J. E. Chase ; and Dr. George Dimmoek reports that the first specimen 

 was taken near S[)ringficld in the early part of May on the Longmeadow 

 road : that it was abundant before autumn and that in July he took it in con- 

 siderable numbers as far south as New Britain, Conn. The first noticed by 

 Mr. E. Norton at Farniington. Conn., were also seen this year but "not 

 often"; in the following year it was quite common. It also became common 

 this year at Walpole, Mass., seventeen miles southwest of Boston. It 

 would appear therefore that, at the close of 1870, the southern limits of the 

 northern host were at about the parallel of 42° 10'-30', with a considerable 

 extension down the Connecticut valley. 



Meanwhile the southern horde was extending its outposts. The entire 

 extent of Long Island was occupied this year, for Prof. S. I. Smith found 

 the butterriy very conmion at Fire Island Beach in August and Mr. B. H. 

 Foster reports destruction at Babylon. In further direction toward the 

 northern band, Dr. Dimmoek found "a few" at Bridgeport, Conn., in 

 July, which may have belonged to the other group, l)ut far more probably 

 were the descendants of tiiose that occupied AA'est Farms the year l)efnre. 

 Dr. 8. Lockwood tells me that it invaded Moninoutli Co., N. Jersey, in 

 1870 and in October of this same year the editor of the American Ento- 

 mologist saw it around fruit stands in Philadelj)hia : ]Mr. W. D. Doan 

 writes that it appeared in scanty numbers this year at Atglen, Chester 

 Co., Penn., and Mr. Townend Glover says that it appeared even as far as 

 Baltimore "anterior to 1870'' : but this I think must be an error of mem- 

 ory. It appears, then, that the southern horde did not this year quite reach 

 the northern, but the two approached each other so nearly as inevitably to 

 mingle in 1871 : and that the northern had almost everywhere reached the 

 eastern seashore of New England and the Canadian pro\nnces, and on the 



