BIRDS OF NORTH AND MIDDLE AMERICA. 



723 



POLIOPTILA CiERULEA C-<ESIOGASTRA Ridgway. 

 BAHAMA GNATCATCHER. 



Similar to 7'. c. e;rt'ufr(( but darker, espociall}^ the under parts, which 

 are mostly pale ])luish oiay. only the al)d()nien and under tail-covcrte 

 being white. 



Adult /nale.— Length (skins), 105-115 (lU.T); wing, 47-52.5 (49.5); 

 tail, 50-54 (51.9); exposed culmen, 9.5-11.5 (10.5); tarsus, 17-18 (17.7); 

 middle toe, 8.5-9 (8.8). « 



Adu/f female.— Length (skins), 105-112 (108.8); wing. 44. .5-48. 5 

 (47); tail, 49-52 (50.6); exposed culmen, 10-11 (10.4); tarsus. 17-18.5 

 (17.5); middle toe, 8.5-9.5 (9).^ 



Resident in Bahamas (islands of Abaco, Andros, New Providence, 

 Little Abaco, and Inagua) and on island of Cozumel and adjacent coast 

 of Yucatan (Merida). 



Polioptila cxruka {not Motacilla cxruJea Linmeus) Cory, Birds Bahama I., 1880, 

 52, part; Auk, iii, 1886, 23, part; Birds W. I., 1889, 37, part.— Sharpe, Cat. 

 Birds Brit. Mus., x, 1885, 442, part.— Ru)G\vay, Proc. U. S. Nat. Mus., viii, 

 1885, 561 (Cozuinel); Auk, viii, 1891, 334 (Abaco I., Bahamas).— Cory, 

 Auk, viii, 1891, 350 (Abaco), 351 (Inagua). 

 \_PoUoptila] civrulea Cory, List Birds W. I., 1885, 6, part. 



I'[olioptila] cxrulea civxiogaster Ridgway, Man. N. Am. Birds, 1887, 569 (New 

 Brovidence I., Bahamas; coll. U. S. Nat. Mus.).— Hellmayr, Novit. Zool., 

 vii, 1900, 535 (crit); Tierreich, 18 Lief., 1903, 21. 

 PoUopt'da cxrulea acsiogaster Ridgway, Man. N. Am. Birds, 1887, 592; 2d ed., 

 1896, 614; Auk, viii, 1891, 335 (New Providence L, Bahamas).— Northrup, 

 Auk, viii, 1891, 67 (Andros I., Bahamas).— Cory, Auk, v, 1888, 157; Cat. 

 W. I. Birds, 1892, 120, 127, 156 (Bahamas).— Bangs, Auk, xvii, 1900, 289 

 (New Providence) .—BoNHOTE, Ibis, 1903, 277 (Little Abaco I.). 

 PoUoptlla atslogaslerf Salvin, Ibis, 1888, 245 (Cozumel I.; crit.). 



n Twelve specimens from Bahamas. 



t- Seven specimens from Bahamas. 



Specimens from different islands average, respectively, as follows 



Locality. 



MALES. 



Eight adult males from Abaco 



Four adult males from New Providence 



Seven adult males from Cozumel and Yucatan 



FEMALES. 



Four adult females from Abaco 



Three adult females from New Providence — 



One adult female from Inagua 



One adult female from Cozumel 



Wing. 



Tail. 



Ex- 

 posed 

 culmen. 



Tarsus. 



50.2 



48 



•17.6 



47.5 

 46.3 

 46 

 47.5 



50.7 

 60.5 

 46 

 ■49 



10.5 

 10.2 

 11 

 11 



17.6 

 17.7 

 17.5 



17.6 

 17.3 

 18 

 17.5 



Middle 

 toe. 



8.8 

 8.7 

 8.7 



9.1 



8.7 



Cozumel specimens are slightly darker above, especially on the pileum, and may 

 prove to be separable from the Bahama birds. 



