RENDAHL, BIRDS FROM THE PEARL ISLANDS. 41 



within definite geographic areas. In three adiilt males mea- 

 sured from San Migiiel he found: wing 73,3; tail 57,8; culmen 

 18,8; tarsus 26,6. Thirteen adult males from Panama main- 

 land had: wing 70,2; tail 56,8; culmen 18,3; tarsus 26,7. 



In the present two specimens one exceeds the greatest 

 measurements found in birds of the mainland, but for the rest 

 I find them entirely agreeing with typical T. r. nigricristatus, 

 and I think the differences in size are to be referred to indi- 

 vidual variation, probably being equalized by the measuring 

 of a greater material. 



Measurements : 



^ ad. Viveros, April 5, wing 74,5; tail 60; culmen 18; 

 tarsus 25,2. 



^ ad. Viveros, April 10, wing 71,5; tail 59; culmen 18,5; 

 tarsus 25,8. 



66. Microphias grisea alticincta (Bångs). 



Drymophila intermedia Bångs, Auk. XVIII, 190L 30 (San Miguel). 

 Formicivora alticincta Bångs, Proc. New. Engl. Zool. Club, III. 1902. 71 (San 



Miguel; type) — Thayer and Bångs, Bull, Mus, Comp. Zoöl, XLVI. 



1905, 150 (San Miguel), 

 Microphias grisea alticincta Ridgway, Birds North Middle Am. V. 1911. 81 



(San Miguel), 



BovALLius' Collection: 1 c^, Viveros, April 7. 



Measurements: wing 53,5, tail 48, culmen 15, tarsus 19. 



Before me I have for comparison 2 males of M. grisea 

 grisea Bodd, sign. Brazil (Bahia) and Brazil and 1 male of the 

 same species sign. Panama?. Two males, sign. Venezuela and 

 Brazilia? are very slightly paler on the upper parts and have 

 broader white tips on the wing-coverts and broader superciliary 

 stripes, and are I think referable to M. grisea intermedia Cab. 



I must admit, that the present specimen from Viveros 

 compares very well with the examples of M. g. intermedia, 

 and I am unable to point out any difference between them. 

 In contrast to M. g. grisea they are characterized by the broad 

 white tips to the wing-coverts and the broad superciliaries; 

 as to the colour the differences are on the whole very slight 

 between all the specimens. 



I would have no hesitation in indicating the Viveros 

 specimen as M. g. intermedia, were it not that the former 

 authors, cited above, had stated, that in the birds from San 



