506 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ff. Collar across lower hindneck distinct, consisting of large, mostly triangu- 

 lar or sagittate spots of dull tawiiy-ochraceous; wliite tip to lateral 

 rectrices much larger on outer than on inner web, less than 29 mm. 

 long (measured along shaft), its anterior outline crossing veiy 

 obliquely; larger (wing averaging 172.6 in male, 169.3 in female). 

 (States of Nuevo Leon, Tamaulipas, and Vera Cruz, eastern Mexico.) 



Antrostonius salvini (p. 525). 



ee. Collar across lower hindneck unbroken, veiy conspicuous. 



/. Collar tawny or tawny-ochraceous ; pileum, scapulars, etc., much more 



heavily spotted or blotched with black, the general coloration of upper 



parts much less uniform, less grayish; inner webs of primaries with 



narrow, iiTegular or broken bars of light cinnamon-rufous; adult males o 



with both webs of lateral rectrices wholly white or white and brownish 



buff distally, this whitish area about 55 mm. long on outermost rectrix. 



g. General tone of coloration much grayer; band across lower throat buffy 



white. (Yucatan.) Antrostomus nelsoni (p. 527). 



gg. General tone of coloration much more rufescent; band across lower 

 throat buff, and narrower. (British Honduras.) 



Antrostomus badius (p. 529). 



ff. Collar buff to ochraceous-buff; pileum, scapulars, etc., much less 



heavily spotted (mostly narrowly streaked) with black, the general 



coloration of upper parts much more uniform and more grayish; inner 



weba of primaries with large, irregularly ovoid or elliptical unbroken 



spots of oclii'aceous-buff; adult males & with white terminal area of 



lateral rectrices mostly confined to inner web, and less than 40 mm. 



long. 



g. Smaller (wing of adult female 155, tail 116, tarsus 15, middle toe 16.5); 



coloration darker. (Southwestern Mexico, in States of Guerrero and 



southern Sinaloa.) Antrostomus ridgwayi (p. 531) 



gg. Larger (wing of adult female 162, tail 121, tarsus 17, middle toe 18.5); 

 coloration paler. (Western Mexico, in State of Sinaloa.) 



Antrostomus goldmani (p. 532). 



cc. No distinct, if any, white, buffy, or ochraceous band across lower throat; 



inner webs of primaries wholly uniform blackish. (Highlands of Costa Rica 



and western Panama.) Antrostomus saturatus (p. 534). 



ANTROSTOMUS CAROLINENSIS (Gmelin). 



CHUCK- WILL'S- WIDOW. 



Rictal bristles with lateral filaments. (The only species of the 

 genus so characterized.) 



Adult male. — General color of upper parts brown (between mummy 

 and bistre), more grayish on posterior scapulars and tertials, every- 

 where minutely vermiculated and sprinkled with black (the vermicu- 



a Except, possibly, in A. badius, the male of which is unknown. The female, how- 

 ever, is so much like A. nelsoni in size and pattern of coloration (except, of course, 

 the lateral rectrices) that I suspect it may prove to be the same species, in which 

 event A. badius, being the older name, should be used. 



b Except, possibly, A. goldmani, of which only the female is known; but as this la 

 evidently very closely related, probably only subspecifically distinct (possibly not 

 even that) from A. ridgwayi, there is little doubt that the tail markings are practically 

 the same. 



