PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 345 



ainples of all the known Mexican GeothlypecVj excepting G. speciosa Scl., 

 of which there is probably no specimen in any American collection. The 

 latter, so fiir as I am able to judge from descriptions, seems to differ in 

 "ochre-yellow" instead of intensely rich gamboge, lower parts,* in the 

 smaller size (wing 2.40, tail 2.30, tarsus .So), and apparently in the ab- 

 sence of a light band bordering the hinder margin of the black mask, 

 which it is said also occupies the top of the head, while in the present 

 bird the black extends backward only .30-.35 of an inch from the frontal 

 antite. From G. trichas, G. melanops, and G. rostrata, the only other 

 related species, the differences are so great as not to need specification. 

 Since the above was written three more specimens (skins) have beea 

 received from Mr. Belding. The two males agree minutely with the 

 one described above, except that the yellow of the lower parts is scarcely 

 so intense, though still much deeper than in the allied species. In both 

 there is the same very slight whitening (for the space of about .20 of an 

 inch) just behind the auricular s, the feathers bordering the black mask 

 being elsewhere entirely light yellow. These specimens measure as 

 follows : 



The female (No. 87534:, San Jose, April 29) differs from the type chiefly 

 in having the auriculars and lores quite distinctly darker, forming a 

 slight indication of the mask of the male. Wing 2.40, tail 2.50, its grad- 

 uation .45; culmen .50, tarsus .90, middle toe .00. 



This fine new species is one well worthy to bear the name of the en- 

 thusiastic naturalist who has had tlie good fortune to discover it — Mr. L. 

 Belding,of Stockton, Gal., already well known to ornithologists through 

 his valuable contributions to our knowledge of Californian birds t — to 

 whom I take great pleasure in dedicating it. 



4. Rallus beldingi, sp. nov. 



Cii. — .Most resembling B. elegans, but darker and richer colored 

 throughout, the sides and flanks with the white bars much narrower, 

 and marked also with very distinct blackish bars. Size, smaller. 



Adult 9 (No. 8G419, Espiritu Santo Islands, Lower California, Febru- 

 ary 1, 1882 ; L. Belding) : Pileum and upper half of nape dark sooty 

 brown or sepia; ground-color of other upper parts deep olive-browu 

 (much as in B. virginianus — decidedly darker than in elegans), broadly 



* Cf. Baird, Review Am. B. i, p. 223, and Salvin & Godman, Biol. Ceutr. Am. 

 Aves. i, p. 152. 



i Cf. these ProceediDgs, vol. i, pp. 388-449. 



