284 THE AMERICAN NATURALIST.  [Vou. XXXV. 
a difference of 2.48 mm.  Austroriparian females show a 
still greater preponderance in length of tail, having a mode 
6 mm. greater and a mean 3.05 mm. greater. Not much 
importance, however, can be attached to the great difference of 
the modes in this case, because of the small number of females 
measured. 
Palmer (98) says, in referring to shrikes of the Appalachian 
and Austroriparian subprovinces respectively: *In migrans 
2200 See ee B 5 
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I] = Y 
: ua coo LEEELLE 
Fig. 5A. b=? EHEH 
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PEPI 
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mm, 10.6 10.9 IL.2 11.5 11,8 12.1 12.4 12.7 13.0 13.3 13.6 13.9 
Fic. 5. — Frequency polygons for length of bill. 4, 164 males from entire region; 2,69 males from 
Austroriparian subprovince ; C, 38 males from Appalachian subprovince. 
[Appalachian] the wing is longer than the tail, due to its 
migratory habit; in ludovicianus [Austrori 
longest, thus indicating its fixed habitat." 
I find, on the contrary, 
than the tail in the Appa 
and VII, pp. 290, 
tail over that of t 
parian] the tail is 
that the wing is not absolutely longer 
lachian form, though from Tables VI 
291, it is clear that the excess of the length of 
he wing is less in migrans than in ludovicianus ; 
