331 



Professor Baird.* Southern specimens differ from northern ones not 

 only in being smaller, but somewhat in color, so that the T. berlandieri 

 of Professor Baird may perhaps be entitled to subspecific rank (T. amer- 

 icana subsp. berlandieri), though the material at hand indicates that 

 the two forms will be found to thoroughly intergrade. The chief differ- 

 ences in coloration consist in the more reddish-gray tint of the southern 

 form, with a decided tendency to a continuous light dorsal stripe, instead 

 of this stripe being restricted to the head. 



Measurements of eleven skulls of TAXIDEA AMERICANA. 



LUTKA CANADENSIS. 



Specimens of this species from northern and southern localities do 

 not differ materially in size; skulls from Newfoundland, Maine, Lake 

 Superior, Washington, and Georgia agreeing very closely iu dimensions. 

 In a series of eighteen (mainly from northern localities), nine attain or 

 exceed a length of 4.25, and three reach 4.50, while two only fall as low 

 as 4.00. Seven specimens from the vicinity of Lake Umbagog, Maine, 

 (in Mus. Comp. Zool.) average 4.28 in length and 2.93 in width ; two of 

 these reach 4.50 in length and two fall slightly below 4.00 (3.96 and 3.97). 

 Two specimens from Washington, D. 0., have a length respectively of 

 4.45 and 4.50; one specimen from Saint Simon's Island, Georgia, is nearly 

 as large (4.32), while a Fort Cobb specimen has a length of 4.22. These 

 four are the only ones from very southerly points. Four other specimens, 

 from as many localities, range from 4.05 to 4.15 ; while three specimens 

 from Newfoundland range from 4.03 to 4.25. While these specimens are 

 top few to warrant positive conclusions as to geographical variations, 

 they seem to point to a great constancy of size throughout a wide range 

 of latitude. 



* U. S. and Mex. Bound. Survey. Zool., p. 21. 



