BIKDS OF NORTH AND MIDDLE AMERICA. 



91 



or o-rajdsh white; bill black; iris brown; legs and feet blackish or 

 dusky horn color. 



Young. — Above soft dark drab gra}^ sometimes faintly glossed with 

 greenish; rump dull white, and tertials edged and margined termi- 

 nally with white; a white supraloral line, as in adults; under parts 

 usually faintly tinged with pale brown on chest and sides of breast. 



AdliUmale.—lj&ngth. (skins), 105-124 (11-1.5); wing, 95-105 (98.3); 

 tail, 10—16 (12.4); exposed culmen, T-8 (7.1); width of bill at frontal 

 antite, 6-7 (6.1); tarsus, 10-11 (10.9); middle toe, 9-11 (9.8).« 



Adult female.— Iji^wgth (skins), 106-120 (114.4); wing, 92-99 (95.5); 

 tail, 40-44 (41.6); exposed culmen, 7-8 (7.5); width of bill at frontal 

 antia\ 6-7 (6.3); tarsus, 11; middle toe, 10.^ 



Coast districts of middle Mexico, in State of Vera Cruz (Gutierrez 

 Zamora, etc.), and Sinaloa (Mazatlan) southward through southeastern 

 Mexico (including Yucatan) and Central America (both coasts) to 

 Isthmus of Panama, and along Pacific coast of South America as far 

 as northern Peru (Chepen).^ 



Petrochelidon leucoptera (not Hirundo leucoptera Gmelin) Lawrence, Anii. Lye. 



N. Y., vii, 1862, 317 (Panama). 

 Petrochelidon alhilinea Lawrence, Ann. Lye. Nat. Hist. N. Y., viii, May, 1863, 2 



(Panama; coll. (t. N. Lawrence). — Sclater and Salvin, Proc. Zool. Soc. 



Lond., 1864, 347 (Panama). — Salvin, Ibis, 1866, 192 (Guatemala to Panama, 



both coasts). 

 Hirundo alhilinea Baird, Review Am. Birds, 1865, 300 (Mazatlan, w. Mexico; 



San Jos(5, Guatemala; Panama R. R. ). — Zeledon, Cat. Av. Costa Rica, 1882, 



5. — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1883, pi. 15, fig. 1. 



(' Fifteen specimens. 



^ Eight specimens. 



Specimens from different localities average in measurements as follows: 



Localitv. 



Wing. 



Tail. 



Ex- 

 posed 

 culmen. 



Width of 

 bill at 

 frontal 

 antise. 



Tarsus. 



Middle 

 toe. 



Five adult male."* from eastern Mexico (State of 



Vera Cruz) 100. 2 



Four adult males from western Mexico (Tepic and j 



Sinaloa 97 



Two adult males from Yucatan ' 100. 5 



One adult male from Guatemala ' 96 



Two adult males from Nicaragua \ 96 



One adult male from Isthmus of I'anama 97 



Two adult females from eastern Mexico (Vera Cruz) 97 



One adult female from Oaxaca 99 



Two adult females from Tabasco 95 



One adult female from Yucatan 92 



One adult female from Nicaragua ] 94 



One adult female from Costa Rica 96 



42.6 



43.5 



42 



40.5 



42 



42.6 



44 



41 



41 



41 



40 



7 

 7.5 



11 



10. S 



11 



11 



10.5 



11 



'^I have not seen specimens from south of the Isthmus of Panama. 



