38G 



NOTES ON birds' STERNA AND SKULLS. 



iu it a skull, steruum, and shoulder girdle wliicli bad been taken from 

 a true Kaveu fully oue-fiftb or more larger tbau tUose I found about 

 Fort AYingate. 



4. The superior aspect of the skull of a specimen of Corvus corax sinuahis, collected hy Dr. Streets 

 in S. E. Alaska; adult. 



5. Same view of the skull of a specimen of this species collected by the writer at Fort "Wingate, New 

 Mexico ; adult. Designed to show the difference in size between the northern and southern races of 

 the American Haven. Both figures life-size and drawn bv the author. 



These skulls difier somewhat in detail, too, and some of the differ- 

 ences, as well as the discre[)aucy iu point of size may be appreciated 

 by examining the figures (Figs. 4 and 5) of the skulls of these birds 

 which I i)resent with this paper. Probablj- no better example than 

 this, illustrating, as it does, a fact long well known to us, could be 



