NATURAL SCIENCES OF PHILADELPHIA. 99 



The three following Anatinx are also found on the Colorado River : 

 (230.) Mareca Americana (Gin.) Steph. 

 (231.) Spatula clypeata (L.) Boie. 

 (232.) Chaulelasmus streperus (L.) Gray. 



(233.) Bocephala albeola (L.) Baird. 



This is the only one of the Fuligulime which, so far as I am aware, has been 

 actually brought from Arizona; though undoubtedly species of Fulix and 

 Ay thy a are found within its limits. 



The same remarks apply to several species of Merginx ; especially to Mcrgus 

 serrator, and Lophodytes cucullalus. 



LARIDJS. 



(234.) Larcs delawarensis Ord. 



This species I saw on the Colorado in the autumn of 1865. It is very pro- 

 bable also that the L. californicus may be detected in the same region. Mr. 

 Xantus has sent it from Fort Tejon, California. 



(235.) Chrcecocephalus atricilla (L.) Lawr. 



Colorado River, particularly its lower portions. A specimen taken over a 

 hundred miles from any body of water, near the eastern border of the Territory. 



(236.) Chroxcocephalus Philadelphia (Ord.) Lawr. 



Very abundant on the Colorado. I am under the impression that I also saw 

 Ch. Franklinii about twenty miles from the river near Fort Mojave. The Colo- 

 rado Valley is quite within its known range of migration. 



237. Sterna Forsteri (Nuttall) Lawrence.* 



S. hirundo, Sw. et Rich. F. B. A. 1831, ii. 412. (Nee. Linn.) 



S. Forsteri, Nuttall, Man. Orn. 1834, ii. p. 274. (Iu foot-note under S. 

 hirundo; name proposed in eveot of " hirundo Sw. Rich." proving 

 distinct. No full description.) 



Lawrence, Ornithological Notes, in Ann. Lye. Nat. Hist, of New York, 

 1852, page 3. Lawrence, B N. A. 1858, p. 862. (Definite characteri- 

 zation of species, and full description.) Coues, Rev Terns N. A.. Pr. 

 A. N. S. Ph. 1862, p. 544. (Gives the different ages and stages of 

 plumage, and compaiisons with hirundo and macrura.) 



S. Havelli, Audubon, Orn. Biog., v. 1839, p. 122, and his other works. 



Lawrence, Birds N. A., 1858, p. 861. Coues, Rev. Terns N. A., Pr. 



A. N. S. Ph. 1862, p. 543. (Considers it as adult winter plumage of 



Forsteri.) 



This species occurs on the Colorado, as indeed on most other of the large 



rivers of the interior. 



(238.) Hydrochelidon fissipes (Linn.) Gray. 



Sterna fissipes, Linn., S. N., 12th ed., 1776, p. 228. 



Hydrochelidon fissipes, Gray, Genera, iii. 1849, p. 660. Coues, Pr. A. N. 



S. Ph., Dec, 1862, p. 554. 

 Sterna nigra, Brisson, Boie, and other authors, but not of Linnaeus, 



which is leucoptera auct. 

 Sterna plumb ea, Wilson; Hydrochelidon plumbe a, Lawrence, and other 

 American writers. (American bird identical with European.) 

 Has been taken on the Colorado. " Mojave River," Cooper. 



* To Mr. G. N. Lawrence of New York is entirely due the credit of first bringing this species 

 prominently into notice, so long ago as the year 1852, and of carefully distinguishing it from 

 hirundo. Nuttall's original notice is so brief and unsatisfactory, that it should hardly be accepted 

 as the first characterization of the species ; which ought in all propriety to bear Mr. Lawrence's 

 rather than Mr. Nuttall's name. For further elucidation of this Tern, see my Kev. Terns N. A., 

 ut supra. 



1866.] 



