738 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



EUTHLYPIS LACHRYMOSA TEPHRA Ridgway.' 

 WESTERN FAN-TAILED WARBLER. 



Similar to E. I. lachrymosa, but sides of head much lighter slate- 

 gray, the lores and anterior portion of suborbital and malar regions 

 never blackish; upper parts lighter slate color, the back, etc., much 

 more strongly tinged with olive; white supraloral spot averaging 

 larger; wing and tail averaging shoiter. 



Ad/itltmale.—l^Qngth (skins), 139-160 (l-M.g); wing, 69-75 (73.1); 

 tail, 65-71 (67.9); exposed culmen, 12-13 (12.4); tarsus, 28-24 (23.1); 

 middle toe, 13. .5-14 (13.6).' 



Achdt female. — Length (skins), 142; wing, 68; tail, 66.5; exposed 

 culmen, 12.5; tarsus, 23; middle-toe, 13." 



Western Mexico, in States of Chihuahua (Hacienda de San Rafael), 

 Sinaloa (Sierra Madre, near Mazatlan), and Jalisco (Barranca Ibarra; 

 San Sebastian). 



Euthlypis lachrymoxa (not of Cabania) Lawrence, Mem. Boat. See. N. H., ii, 

 1874, 270 (Mazatlan, Sinaloa; habits).— Jouy, Proc. U. S. Nat. Mus. , x vi, ■ 

 1893, 777 (Barranca Ibarra, Jalisco; habits). 



Setophaga lachrymosa Sal\'in, Ibis, 1878, 320, part (Mazatlan). — Salvin and 

 GoDMAN, Biol. Centr.-Am., Aves, i, 1881, 184, part (Mazatlan). 



Genus BASILEUTERUS Cabanis. 



Bojiileuterus * (Jabanim, in Wiegmann's Archiv. fiir Naturg., iii, pt. i, 1847, 316. 



(Type, Sylvia eermivora \\e\\loi,= Setophaga aurocapilla Swainson.) 

 Idiotes Baird, Review Am. Birds, April, 1865, 237, 247. (Type, Setophaga rufi- 



frons Swainson. ) 



Similar to W/'lson/a, but wing relativelj^ shorter and much more 

 rounded (ninth primary shorter than fourth instead of longer than 

 fifth), wing-tip shorter (less than half as long as tarsus instead of much 

 more), bill relatively longer, stouter, and less compressed terminally, 

 and pileum three-striped (two lateral black stripes inclosing one of 

 chestnut, rufous, butfy, or grayish) or wholly rufous, or else the 



^Type, no. 151906, coll. U. S. Nat. Mus., Hacienda de San Rafael, Chihuahua, 

 May 10, 1888; M. Abbott Frazar; received from William Brewster. 

 '' Eight specimens. 

 ' One specimen. 

 Adult males from different localities average, respectively, as follows: 



' '^pcxdiXevTspoc, von fiaOiXevi Regulus.' 



