80 BULLETIN 50, UlSnTED STATES NATIONAL MUSEUM 



Type locality. — Tobari Bay, Sonora, Mexico. 



Rallus obsoletus rJiizophorae Dickey, Trans. San Diego Soc. Nat. Hist., vi, 1930, 



235 (orig. descr. ; Tobari Bay, Sonora, Mexico). 

 Rallus eleffans rhizophorae Feters, Clieck-list Birds of World, ii. 1934, 159. 

 Rallus longirostris rhizophorae Oberholseb, Proc. V. S. Nat. Mus., Isxxiv, 1937, 



342 (monogr. ; crit.). 



RALLUS LONGIROSTRIS NAYARITENSIS McLellan 



San Bi.as Clapper Rail 



Adult (unsexed; only the type known). — Similar to Rallus longi- 

 rostris yunmnensi^, but the top of the head, hind neck, and the cen- 

 ters of the feathers of the upperparts of the body darker — deep 

 fuscous, becoming hair brown on the head, the upper breast 

 brighter — light ochraceous-salmon, the lower breast and abdomen 

 much paler and whiter — very pale pinkish buff; sides and flanks 

 slightly paler and grayer. Forehead dark hair brown, darkening to 

 fuscous on the crown, the feathers with stiff, shiny blackish shafts; 

 occiput and nape dark hair brown with narrow lighter edgings be- 

 tween drab and grayish olive, these edges imparting a streaked 

 appearance; scapulars, interscapulars, back, rump, and upper tail 

 coverts fuscous-black, the feathers of the anterior parts all margined 

 with light grayish olive and those of the rump and the upper tail 

 coverts with brownish deep grayish olive; rectrices with an even 

 darker shade on their edges; wings fuscous, the lesser upper wing 

 coverts, with the outer portion of the outer median and lesser coverts 

 more or less extensively rufescent brown (between snuff brown and 

 Saccardo's umber), the inner coverts, the innermost secondaries, 

 and the scapulars broadly margined with dull grayish olive, sides 

 of head mouse gray rather than darker on the lores ; the auriculars 

 with a buffy wash; supraloral streak creamy white; sides of neck 

 mouse gray w^ashed with buffy; chin and upper throat pure white; 

 malar stripe and lower throat between avellaneous and pinkish 

 cinnamon ; breast light ochraceous-salmon, paling posteriorly to light 

 pinkish cinnamon and then to very pale pinkish buff; sides and 

 flanks between hair brown and chaetura drab, nan'owly barred with 

 dull white, the posterior portion of flanks paler and washed with 

 buffy; abdomen very pale pinkish buff paling to creamy white on 

 the midventral area; lower tail coverts between hair brown and 

 chaetura drab, narrowly barred with white, and slightly tinged with 

 buff anteriorly, the lateral feathers almost wholly white; thighs 

 anteriorly buffy white; posteriorly dull hair brown; under wing 

 coverts dark chaetura drab, narrowly barred with white. 



Wing 129+ (molting) ; tail 56.5; exposed culmen 59; tarsus 50.5; 

 middle toe without claw 49 mm. 



