BIRDS OF NORTH AND MIDDLE AMERICA. 545 



Adult male.— Length (skiiis), 255-275 (264); wing, 154.5-171.5 

 (161.3); tail, 148-157 (153.1); exposed culmen, 12-13.5 (12.6); tar- 

 sus, 23.5-26 (24.7); middle toe, 20-22 (21.1).'» 



Adult female.— Length, (skins), 245-272 (251); wing, 157-169 

 (159.4); taU, 139.5-158.5 (144.8); exposed culmen, 10.5-14 (12.1); 

 tarsus, 23-25.5 (24.2); middle toe, 19-20.5 (19.9).^ 



Southwestern and middle-western Mexico, in States of Sinaloa 

 (Mazatlan; Presidio de Mazatlan; Escuinapa), Jalisco (Ixtapa; 

 Plains of Colima), Colima CNIanzanillo ; Colima), Guerrero (Acapulco), 

 and Oaxaca (Santa Efigenia; Tehudntepec; Cuicuitlan; Chihuitan; 

 Salina Cruz), and Territory of Tepic (Santiago; Acaponeta); north- 

 western Chiapas (Tonala)?; Mexico (near (3ity of Mexico) ?; Zaca- 

 tecas ? 



Nyctidromus albicollis (not Caprimulgus alhicollis Gmelin) Lawrence, Mem. Bost. 



Soc. N. n., ii, 1874, 291, part (Mazatlan; Plains of Colima); Bull. U. S. Nat. 



Mus., no. 4, 1876, 31 (Santa Efigenia, Oaxaca).— Salvin and Godman, Biol. 



Centr.-Am., Aves, ii, 1894, 393, part (Presidio de Mazatlan; Mazatlan; San 



Bias and Santiago, Tepic; Plains of Colima; Colima; Zacatecas; Chihuitan, 



Santa Efigenia, Tehuantepec, Chimalapa, and Salina Cruz, Oaxaca; Tonal^, 



Chiapas?; Acapulco, Guerrero). 

 {!) Nyctidromus guianensis (not Caprimulgus guianensis Gmelin) Sclater, Proc. 



Zool. Soc. Lond., 1864, 176 (near City of Mexico). 

 Nyctidromus albicollis merrilli (not of Sennett) Miller (W. De W.), Bull. Am. 



Mus. N. H., xxi, 1905, 352 (Escuinapa, s. Sinaloa, resident). 

 Nyctidromus albicollis nelsoni Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 



90 (Colima, Colima, s. vr. Mexico; coll. U. S. Nat. Mus.). 



NYCTIDROMUS ALBICOLLIS INSULARIS Nelson. 



TRZS MARIAS CUIEJO. 



Similar in coloration to the tawny or rufescent phase of N. a. 

 nelsoni but less bright (not so pronouncedly rufescent) •= and size 

 decidedly greater. 



Adult male.— Length (skins), 280-290 (285); wing, 164.5-177.5 

 (173); tail, 157-167 (164.9); exposed culmen, 12-13.5 (12.7); tarsus, 

 24-26 (25.1); middle toe, 19-20.5 (19.9).'^ 



Adult female.— Length (skins), 268-285 (274); wing, 161-174 

 (168.9); tail, 149-159 (154.9); exposed culmen, 11.5-13 (12.6); tar- 

 sus, 23-25 (24.3); middle toe, 18.5-20 (19.7). ' 



a Nine specimens. 

 & Ten specimens. 



c The general tone of coloration (which is very uniform in the series examined) is 

 nearly midway between the extreme phases of iV". a. nelsoni. 

 d Five specimens. 

 « Six specimens. 



3622°— Bull. 50, pt 6—14 35 



