28 Proceedings of the Biological Society of Washington. 



442 (Cordova, Mexico). — Salvin and Sclater, Ibis, 1860, 399 (Choc- 

 tum, Guatemala). — Sclater, Proc. Zool. Soc. London, 1860, 465 (ref. 

 orig. descr.; syn.; range). — Sclater, Cat. Am. Birds, 1862, 226 (Cordova, 

 Mexico, and Choctum, Guatemala). — Gray, Hand-List Birds, I, 1869, 

 359 (in list of species; range). — Sumichrast, Mem. Boston Soc. Nat. 

 Hist., I, 1869, 557 ("tierra caliente," Vera Cruz, Mexico). — Sclater 

 and Salvin, Nom. Av. Neotrop., 1873, 51, part (Mexico, in range). — 

 Sclater, Cat. Birds Brit. Mus., XIV, 1888, 200, part (Mexican, Guate- 

 malan, and British Honduras references and localities; descr.). — Salvin 

 and GoDMAN, Biol. Centr.-Am., Aves, II, 1889, 57, part (Mexican, 

 Guatemalan, and British Honduras localities and references; descr.; 

 crit.).— Salvin, Ibis, 1889, 360, and 1890, 87 (Cozumel I., Yucatan).— 

 Lantz, Trans. Kansas Acad. Sci., "1897-98," 1899, 222 (Cayo, British 

 Honduras). — Sharpe, Hand-List Birds, Hi, 1901, 131, part (range). 



Myiobius sulphureipygia Dubois. Syn. Avium, I, 1902, 245, part (refer- 

 ences; range; syn.). 



Myiobius xanthopygus sulphureipygius Ridgway, Bull. U. S. Nat. Mus., 

 No. 50, IV, 1907, 487, part (diag.), 490, part (descr.; range; meas.; refer- 

 ences).— Bangs, Proc. New England Zool. Club, IV, 1908, 27, 28, in text 

 (crit.)— Peters, Auk, XXX, 1913, 376 ("30 mUes north of Camp 

 Mengel, " Quintana Roo, Mexico). 



Myiobius sulphureipygius sulphureipygius Hellmayr, Proc. Zool. Soc. 

 London, 1911, 1135, 1136 (range; crit.). 



Description. — Above dull olive green, the pUeum and nape more or less 

 suffused with brownish, the former with a partially concealed vertical spot 

 of light cadmium or lemon chrome; rump picric yellow or Martins yellow; 

 upper tail-coverts and tail dull black; wings dusky, margined externally 

 with buffy brown; throat dull white, shaded with yellow posteriorly; breast, 

 sides of head and neck, and abdomen laterally strongly suffused with 

 ochraceous or antimony yellow, leaving only the middle of the abdomen pale 

 yellow (barium yellow); tibiae brownish olive; crissum more or less buffy 

 brown; "iris dark hazel; bill horn brown above, mostly whitish below; feet 

 blue. " (Female with the yellow vertical patch restricted, merely indicated, 

 or wanting). 



Measxirements. — Male (seven specimens): wing, 64-69 (66); tail, 54—59 

 (56); bill, 10-12.5 (11.5); tarsus, 17-18 (17.5). Female (four specimens): 

 wing, 59-63 (61); tail, 50-53 (52); bill, 10-10.5 (10.3); tarsus, 16-16.5 

 (16.3). 



Range. — States of Vera Cruz and Oaxaca, Mexico, east and south to 

 Yucatan, British Honduras, and Guatemala, in the Tropical Zone. 



Remarks. — "The first specimens of this species sent to Europe were 

 probably those obtained by Deppe at Valle Real in Mexico, which remained 

 undescribed under Lichtenstein's MS. name, M. mexicanus, in the Berlin 

 Museum. In 1856 Mr. Sclater received examples from M. Sall6 which he 

 named M. sulphureipygius, comparing the species with the allied M. 

 barbatus. The range of this bird in Mexico appears to be extremely 

 limited, and probably strictly confined to the hot low-lying forests of the 



