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THE CANADIAN ENTOMOLOGIST. 



Bay, Lake Nipissing, 175 miles north of De Grassi Pt., a series of speci- 

 mens of Podisma were taken, which showed features belonging to both 

 species, but were nearer P. glacialis. Some of these were sent to Mr. 

 Scudder, who named them glacialis, " vaiying slightly towards variegata, 

 especially in the (feebly) banded hind femora." 



Since then I have collected a considerable series of specimens from 

 two localities intermediate in latitude between Lake Simcoe and Lake 

 Nipissing, viz., at Tobermory, near Cape Hurd (Bruce Co.), and at 

 Algonquin Park. I have also examined a series of 4 $ ^ and 3 $ $ taken 

 at several different localities in Pennsylvania, belonging to the museum of 

 the Academy of Natural Sciences of Philadelphia, and kindly loaned 

 to me through Mr. J. A. G. Rehn. To complete my collection, I have 

 specimens of typical glaciahs from the following localities in New Eng- 

 land : Mt. Washington, N. H. (3 ^J cJ , 3 V ? ); Greylock Mt., Mass. 

 (2 (J cJ , 2 V ? ) ; Speckled Mt., Stoneham, Me. (3 cT c? , 3 ? ? )• 



A careful study of all these specimens lias revealed a complete series 

 of gradations from the typical glacialis of the White Mountains to the 

 typical variegata from Pennsylvania, though these extremes are widely 

 different, not only in structure and markings, but in habits and character of 

 environment. 



The chief points of distinction between the two forms as given by 

 Mr. Scudder may be tabulated as follows : 



A study of my series gives the following results : 



I. Eyes. — Those of the N. E. specimens (yj'^xQ.sX glacialis) are the least 

 prominent, the specimens from Mt. Washington having less prominent 

 eyes than those from Speckled Mt. and Greylock Mt. Among the rest of 



