1914] Orinnell: Mammals and Birds of the Colorado Valley 141 



The inference is that the nuttalli of the Colorado Valley are winter 

 visitants from the Great Basin region. That these, however, are 

 identical with typical nuttalli. described from South Dakota (accord- 

 ing to A. 0. 1*. Check-List, 1910, p. 197), is problematical. I have 

 had no opportunity for comparison of relevant material. Neither is 

 there assurance that the Colorado Valley nitidus is typical of the 

 form bearing that name and described from the Nueces River, 

 southern Texas (Brewster, 1887, p. 147). In the original description 

 of the latter, restriction of dark markings and general paleness are 

 emphasized characters, which are in accord with the Colorado Valley 

 nitidus. Ridgway (1887. p. 58S) adds the character of small size. 

 The difference in facial mottling, mentioned by both of the authors 

 just cited, is not clearly in evidence in the Colorado Valley material. 



It is to be remarked that Phalat noptilus nuttalli californicus, repre- 

 sented by specimens from central and southern California west of the 

 desert divide, is well differentiated from both of the forms here pointed 

 out. Three races of the poor-will thus occur within the state of Cali- 

 fornia, and as there are good grounds for believing that P. n. nuttalli 

 summers east of the Sierran divide in northeastern California, all 

 three probably breed within the limits of the state. 



In this connection sixty-seven adult-plumaged poor-wills have been 

 examined. 



LIST AND DIMENSIONS IN MILLIMETERS OF PHALAENOPTILUS NUTTALLI 

 NUTTALLI FEOM THE COLORADO VALLEY 



9th primary 



exceeds Wing 



No. Sex Locality Date Wing Tail 10th by formula 



12780 <f Riverside Mt., Calif, side Mar. 18 145.5 89.0 5.5 9-8-10-7 



12785 J' Opposite Cibola, Calif, side Apr. 2 140.0 88.2 too worn 



12791 J 1 8 mi. E. Picacho, Calif, side Apr. 18 136.3 84.0 too worn 



12777 J Chemehuevis Val., Calif, side Mar. 10 133.8 80.3 4.7 9-8-10-7 



12788 ^ 10 mi. S. Cibola, Ariz, side Apr. 7 142.4 82.0 too worn 



12783 J Ehrenberg, Ariz, side Mar. 27 144.3 82.0 7.4 9-8-7-10 



Average of the males, 140.4 84.2 5.9 



12790 $' 8 mi. E. Picacho, Calif, side Apr. IS 138.1 82.5 7.5 9-8-7-10 



127S9 $ 20 mi. N. Picacho, Calif, side Apr. 10 144.2 82.5 7.1 9-8-7-10 



127*4 ? Opposite Cibola, Calif, side Mar. 31 142.7 85.6 8.7 9-8-7-10 



12779 $ Riverside Mt., Calif, side Mar. 18 139.0 80.0 4.7 9-S-7-10 



12776 2 Chemehuevis Val., Calif, side Mar. 10 138.0 85.0 5.2 9-8-10-7 



12793 $ 5 mi. N. Lagnna, Ariz, side Apr. 22 141.0 81.2 5.5 9-8-7-10 



Average of the females 140.5 82.8 6.4 



Average of the 12 specimens 140.4 83.5 6.2 



' Dissection showed reproductive organs to be inactive. 



