342 • PROCEEDINGS OF THE NATIONAL MUSEUM vol. 84 



feathers of crissum being nearly all wliite on their outer webs, the 

 white bars on the sides about 1 mm wide, their brown interspaces 

 about 8 mm; thighs between drab and hair brown posteriorly, dull 

 cream wliite anteriorly; Hning of wing grayish hair brown with very 

 narrow widely spaced bars of dull white. 



Measurements. — Adult male ^^: Wing, 156 mm; tail, 71; exposed 

 culmen, 58 ; tarsus, 51.5; middle toe without claw, 46. Adult female *^: 

 Wing, 142-148 (average, 145); tail, 62-63 (62.5) exposed culmen, 53.5; 

 tarsus, 50; middle toe without claw, 44-45 (44.5). 



Type locality. — Bard, Imperial County, Calif. 



Geographic distribution. — Permanent resident in southeastern Cali- 

 fornia, from the Colorado River above Yuma, north to the Laguna 

 Dam, and west to Salton Sea. 



Remarks. — In this race the jugulum is entirely without grayish 

 tinge. In the three specimens examined there is no indication of any 

 definite color phase, though a male taken on May 15, 1921, at Bard, 

 Imperial County, Cahf., is much lighter on the anterior lower parts 

 and slightly paler on the flanks than the female taken on May 5, 1921, 

 but it is otherwise the same. Perhaps a larger series would show the 

 existence of definite color phases. The bird inhabits apparently only 

 the fresh-water marshes and canals adjoining the lower Colorado 

 River and Salton Sea. It has never been taken elsev/here. It 

 undoubtedly is one of the rarest of the rails of this group, and on 

 account of its limited distribution and the circumstances under which 

 it must exist it is possibly already extinct. 



The following specimens have been examined: 



Califorxia: Bard, Imperial County (May 15, 1921,^o]yxay 27, 1921). 



RALLUS LONGIKOSTRIS RfflZOPHORAE Dickey 



SoNORA Clapper Rail 



Rallus obsoletus rhizophorae Dickey, Trans. San Diego Soc. Nat. Hist., vol. 6, no. 

 18, p. 235, Dec. 24, 1930 ("Tobari Bay, southern Sonora, Mexico"). 



Suhspecific characters. — Similar to Rallus longirostris yumanensis, 

 but upper parts darker, more grayish (less brownish) ; anterior lower 

 parts somewhat paler and duller; sides and flanks more grayish and 

 somewhat darker. 



Measurements. — Adult male^': Wing, 147-155.5 (average, 151.8) 

 mm; tail, 60.5-65 (63.3); exposed culmen, 56-60.5 (59); tarsus, 54.5- 

 58.5 (56.4) ; middle toe without claw, 45.5-51.5 (48.3). Adult female^^: 

 Wing, 139.5-148 (142.6); tail, 58-65 (61.6); exposed culmen, 53-57.5 

 (55.2); tarsus, 49-56 (50.9); middle toe without claw, 42-47 (43.8). 



*' One specimen (the type), from southeastern California. 



*' Two specimens, from southeastern California. 



•o Type. 



»i Five specimens, from Sonora, Mexico, including the type. 



" Nine specimens, from Sonora, Mexico. 



