440 



BULLETIN ")(), UNITED STATES NATIONAL MUSEUM. 



tail, 52-71.5 (60.0); exposed culmen, 11-13.5 (11.9); tarsus, 14-18 

 (15.0); middle toe, 10-12.5 (11. 5). « 



Adult female.— Jjencrth (skins), 127-163 (142); wins:, 74-90.5 (82.3); 

 tail, 50-66 (58.6); exposed culmen, 10.5-13 (12.1); tarsus, 14-17.5 

 (14.9); middle toe, 10-12.5 (11.4).^ 



Southeastern Mexico, in States of Vera Cruz (Cordova; Jalapa; 

 Cateniuco; PasaNueva; San Andreas Tuxtla; Playa Vicente), Tabasco 

 (Teapa), and Chiapas (Palenque), southward through Guatemala 

 (Coban; Las Salinas; Cajabon; Chisec), Costa Rica (San Jose; Tucur- 

 riqui; Barranca de Nicoya; Turrialba; Guaitil; Naranjo; Navarro; 

 Reventazon; Pozo Azul de Pirris), and Panama (Chitra; David; Bo- 

 gaba; Paraiso Station; Lion Hill Station; Panama City), and greater 

 part of South America, from Colombia to Guiana, Ecuador, Bolivia, 

 southern Brazil, and Paraguay. (No records for British Honduras, 

 Honduras, Salvador, nor Nicaragua.) 



Tyrannus albicollis YiEiLhOT , Noiiv. Diet. d'Hist. Nat., xxxv, 1819, 89 (P^-aguay; 



based on Suiriri chorreado sin roxo Azara, Apunt. no. 186); Enc. Meth., 



1823, 854. 

 M[uscipeta] albicollis D'Orbigny and Lafresnaye, Mag. de Zool., 1837, Synop. 



Av., p. 47 (Guarayos, Bolivia). 

 Musdpeta albicollis D'Orbigny, Voy. Amer. Merid., Ois., 1839, 318 (Rio San 



Miguel, Guarayos, Bolivia). 

 Tyrannida albicollis Hartlaub, Index Azara's Apunt., 1847, 12. 

 \^Tyranmda\ albicollis Bonaparte, Consp. Av., i, 1850, 190 (Paraguay; Bolivia). 

 Elaenea albicollis Cabanis, in Schomburgk's Reis. Brit. Guiana, iii, 1848, 701. — 



BuRMEiSTER, Syst. Ueb. Th. Bras., ii, 1856, 475. 



« Twenty-two specimens. 



b Eleven specimens. 



Notwithstanding the great variation in size in this species 1 am not able to subdivide 

 it satisfactorily, color-variations being apparently as unreliable as measurements. 

 Specimens measured average as follows- 



Locality. 



Middle 

 toe. 



MALES. 



Four adult males from southern Mexico (Vera Cruz, Ta- 

 basco, and Chiapas) 



Six adult males from Costa Rica 



Three adult males from Panama 



Four adult males from Colombia 



One adult male from Venezuela , 



One adult male from Trinidad 



One adult male from Cayenne 



Two adult males from Brazil 



FEMALES. 



Three adult females from southern Mexico 



Four adult females from Costa Rica 



One adult female from Panama 



Two adult females from Colombia 



One adult female from Brazil 



12.3 



11.7 



11.8 



11.1 



11 



11 



10.5 



10.8 



12.2 



11.4 



11 



10.8 



11 



