Vol "5i9 XVI ] Bergtold, The Crow in Colorado. 203 



of the Atlantic-Gulf of Mexico watershed, part of which watershed 

 forms the western portion of Texas, an area included in the present 

 known range of hesperis. It does not seem unreasonable to believe 

 that hesperis works its way from western Texas, up along the Rio 

 Grande, finally reaching the vicinity of Antonito, and also the San 

 Luis Valley. In support of this latter view 1 am permitted to say 

 that Mrs. Jesse Stevenson of Monte Vista, Colorado, recently saw a 

 Crow for the first time in twenty-five years in this valley, and was 

 at once impressed with its small size as compared with those she 

 formerly studied in the East. 



As mentioned above, it is clear that hesperis occurs on both sides 

 of the Rocky Mountains in Colorado. Now one must ask if sub- 

 species brachyrhynchos occurs on the western slope as well as on 

 the eastern slope. 



1 cannot even inferentially decide whether or not subspecies 

 brachyrhynchos reaches the west side of the Rockies in Colorado; 

 there is but one reference to it in literature, known to me, as occur- 

 ring on the western slope of Colorado, to-wit, that by Warren (20) 

 who listed the Crows of Gunnison County as subspecies brachy- 

 rhynchos, doing it, however, as a matter of expediency only, as he 

 took no specimens. If this subspecies does range to the west side 

 of the Rocky Mountains in Colorado, 1 believe it will be found in 

 northwestern Colorado, coming in as a straggler from Wyoming. 

 Records of the Crow from northwestern Colorado and southwestern 

 Wyoming are lacking (21), or at least unknown to me. 



One can hazard the guess that the Crows of southeastern Colo- 

 rado are subspecies brachyrhynchos, but hesperis may also be found 

 in that area, coming in as an infiltration from Texas. 1 am con- 

 vinced that hesperis works its way up from the Lower Rio Grande 

 Valley, along the eastern foothills, finally reaching, as we now know, 

 as far north as Weld County. 



It is highly desirable that a considerable series of Crow skins be 

 collected from Colorado, embracing specimens especially from the 

 western portions of the State, and also from the southern border, 

 to the end that the exact distribution of subspecies brachyrhynchos 

 and hesperis be definitely delimited for Colorado. 



