92 Bulletin Wisconsin Natural History Society. [Vol. 9, No. 3. 



This was as far as I went at the time. Later, in 1910, when 

 rearranging the collections, a more careful examination of the 

 material was made with a view toward the discovery of constant 

 specific characters. One result was the discovery of T. morio 

 n. sp., whose color resemblance to the other specimens had caused 

 me to overlook it previously. Characters seemed plentiful and 

 were fairly constant in most cases. Yet since the material was 

 regional, it could be assumed that at least some of the characters 

 were likewise regional. Eventually this proved to be the case. 



Before attempting to describe T. morio I found it imperative 

 to ascertain the exact values of existing species. The various 

 descriptions seemed confusing, and in a number of cases did not 

 agree at all with the original descriptions. 



It was necessary to obtain additional material, especially from 

 the Austral region. Such was kindly supplied by Dr. Philip P. 

 Calvert of Philadelphia, Mr. E. B. Williamson of Bluffton, Ind., 

 Dr. E. M. Walker of Toronto, Ont, Messrs. C. S. Brimley and E. 

 Sherman, Raleigh, N C, and the U. S. National Museum. 



Dr. Calvert's material showed a number of interesting forms 

 from diverse and widely separate localities. Mr. Brimley's and 

 Mr. Sherman's material was entirely from North Carolina and 

 was for that reason especially welcome. As usual, Mr. William- 

 son furnished the richest material, rich in number, variety and 

 localities. That of Dr. Walker was regional. The National 

 Museum specimens covered several regions untouched by the 

 remaining lots. 



Characters. 



The characters considered in this study may be conveniently 

 classed into venational, structural and color characters. 



Venation. — A comparison of the tables will show that there 

 is a very gradual increase in the venation, with cynosura and 

 cants as the two extremes. Yet this increase is so gradual and 

 the amount of variability from the mean is so great that the vena- 

 tion cannot enter as a factor in the determination of the more 

 nearly related species. The antenodals increase from six to ten 

 in the fore wings and from four to six in the hind wings. The 

 postnodals increase in a less striking manner. Co-ordinate with 



