Carriker : List of the Birds of Costa Rica. 499 



f. White area of tail confined to apical portion of rectrices 

 and shorter, covering not more than 1 6 mm. at tips. 



Antrostomus saturatus, $ . 

 ff. White jugular patch present ; white tips to rectrices 

 longer (40 to 50 mm.); little or no rufous spotting. 



Antrostomus vociferus, $ . 

 dd. Immaculate area buff-ochraceous. 



e. Buffy area confined to apical portion of both webs of three outer 

 rectrices. 

 f. Inner webs of primaries without markings ; no jugular 

 patch ; profusely spotted above and below with rufous. 



Antrostomus saturatus, 9 • 

 ff. Inner webs of primaries barred with rufous ; a white jugu- 

 lar patch ; no rufous spotting except on wings. 



Antrostomus vociferus, 9 • 

 ee. Buffy area confined to subterminal portion of inner webs of 

 three outer rectrices (only buffy on under side, white above) 

 and extends basally to tips of under tail-coverts. 



Antrostomus carolinensis, $ . 

 cc. No immaculate area of white or buffy- white on any of the rectrices, usu- 

 ally brokenly barred with dusky and grayish or buffy. 

 d. Size large (wing, 210; tail, 145 mm.); primaries brokenly barred 

 with rufous-buff; tail without lighter buffy edgings on inner 

 webs. Antrostomus carolinensis, 9« 



dd. Size small (wing, 140; tail, 105 mm.); primaries with a large 

 spot of buft-ochraceous and a smaller spot near base, no bars ; 

 inner webs of rectrices edged with yellowish buffy. 



Stenopsis albicauda, 9 . 

 bb. Rictal bristles small and inconspicuous ; lower parts barred with dusky and 

 grayish -white or buff-ochraceous. 

 c. Throat patch pure white. 



d. Lower parts barred with sooty-black and pure white. 



e. Upper parts paler, with more buffy and white spots on pileum 

 and more grayish vermiculations on back and wings. 



Chordeiles virginianus henryi, <£ . 

 ee. Upper parts darker, with less spotting and vermiculations. 



Chordeiles virginianus virginianus, $ . 

 dd. Lower parts barred with sooty-black and buff-ochraceous ; under 

 tail-coverts buffy. Chordeiles acutipennis texensis, $ . 



cc. Throat patch buff-ochraceous. 



d. Under surface of primaries blotched with buffy posterior to the 

 usual large isolated patch ; under parts very ochraceous. 



Chordeiles acutipennis texensis, 9 • 

 dd. Under surface of primaries sooty-gray, without blotches, except 

 the usual large isolated spot (white). 

 e. Wings and upper parts dark, with little grayish flecking. 



Chordeiles virginianus virginianus, 9 • 



