New Birds from Western Mexico. 11 



of tail dull black ; lores, ear coverts, and fore part of chin black. Dimen- 

 sions of type: wing, 101 ; tail, 104; culmen, 29; tarsus, 32. 



Averages of Melanotis cserulescens. — tf (4 specimens): wing, 115.5; tail, 

 125.5 ; culmen, 24.9 ; tarsus, 31.2. $ (1 specimen) : wing, 106 ; tail, 111; 

 culmen, 24.5; tarsus, 29. 



Averages of M. cserulescens longirostris. — rf (3 specimens) : wing, 104.6; 

 tail, 105; culmen, 29; tarsus, 30.6. 9 (1 specimen): wing, 108; tail, 

 102; culmen, 29; tarsus, 32. 



The grayer colors, smaller size, and larger bill are the main points dis- 

 tinguishing this form from typical cserulescens. 



Thryothorus lawrencii magdalenae subsp. now Magdalena Island 



Wren. 



Type No. 156943, U. S. Nat. Mus., Biological Survey Coll., ad. $, Mag- 

 dalena Island, Mexico, May 28, 1897. Collected by E. W. Nelson and 

 E. A. Goldman. 



Description of type. — Back warm umber brown with a slight grayish wash; 

 top of head and neck deeper, purer rufescent than back ; rump and upper 

 tail coverts lighter, brighter rufescent than back ; wings and middle tail 

 feathers rufous brown ; tail irregularly barred with blackish brown and 

 whitish, the latter color more or less heavily shaded with dull rufous 

 brown ; a distinct white supra-loral stripe from base of bill to nape ; sides 

 of head and neck indistinctly marked with blackish lines ; chin, throat, 

 breast, and middle of abdomen white; sides of breast and flanks reddish 

 brown; under tail coverts whitish with a shaft line and spot (or bar) of 

 blackish In-own near tips. Dimensions of type: wing, .55; tail, 55; cul- 

 men, 16.5; tarsus, 21. 



Average of 3 adult males of Thryothorus lawrencii. — Wing, 60 ; tail, 55.6 ; 

 culmen, 17.2; tarsus, 22. 



This form combines certain characters of typical T. felix with those of 

 T. lawrencii. The rufous on the crown and nape is even deeper than in 

 typical felix, while the white lower parts are as in true lawrencii. 



Compared with a specimen of felix from Ometepec, Guerrero, believed 

 to be typical, magdalense has a pure white area covering most of lower 

 parts in place of the rich rufous of felix. The rufous of the flanks is paler ; 

 under tail coverts less barred ; crown and rump nearly the same shade of 

 rufous; back a little grayer; sides of head much less heavily streaked 

 with black. 



From lawrencii it may be distinguished by its much richer colored or 

 more rufous upper parts, by somewhat heavier dark streaking on the side 

 of the head and neck, and by the richer wash of rufous on the flanks. 



