520 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ANTROSTOMUS VOCIFERUS MACROMYSTAX (Wagler). 



STEPHENS'S WHIPPOORWILL. 



Apparently not constantly different in any color character or set of 

 color characters from A. v. vociferus,^ but averaging decidedly larger 

 and with the rictal bristles very much longer and stouter. 



Adult maZe.— Length (skins), 220-265 (238); wmg, 162-178.5 

 (166.3); tail, 114-134.5 (124.2); exposed cuhnen, 12.5-16 (14.6); 

 tarsus, 15-18.5 (16.8); middle toe, 15.5-19 (16.9).^ 



Adult female.— Length (skins), 220-248 (231); wing, 156.5-166.5 

 (162.1); tail, 114-128 (121.3); exposed culmen, 13.5-15.5 (14.5); 

 tarsus, 15.5-18 (16.9); middle toe, 15.5-18 (16.9).'= 



Southern Arizona (Huachuca, Chiricahua, Santa Rita, Santa Cata- 

 lina, San Luis, and Whetstone mountains). New Mexico (Big Hatchet 

 Mountains; Ft. Bayard), and southwestern Texas (Chisos Moun- 

 tams) southward over greater part of Mexico, m States of Sonora 

 (Alamos), Chihuahua (Bravo; Mina Abundancia; Pinos Altos; near 



a The only approach to average differences of coloration than I can find on carefully 

 comparing a large series of each form, is that in A. v. macromystax the black sj^ots on the 

 scapulars are, as a rule, somewhat more irregular or "ragged," and the black streaks 

 on the pileum are usually somewhat smaller and less inclined to coalesce along the 

 median line, while the general "tone" of coloration is slightly more brownish (less 

 grayish), especially on the pileum, and particularly in the female. None of these 

 characters, however, except possibly the last, can be relied on, the individual varia- 

 tion being very great in both forms. 



The young oi A.v. macromystax, however, may be very easily distinguished from that 

 of A. V. vociferus, the scapulars and wing-coverts being broadly barred with dusky 

 instead of being (except for large black spots on the former and small ones on the 

 latter) immaculate ochraceous-buff . In fact, the young of A. v. macromystax is in color- 

 ation quite like that of A. chiapensis except that the inner webs of the primaries are 

 much more distinctly spotted with tawny cinnamon-rufous. 



b Twenty-one specimens. 



c Thirteen specimens. 



Locality. 



Wing. 



TaU. 



Ex- 

 posed 

 culmen, 



Tarsus, 



Middle 

 toe. 



MALES. 



Seven adult males from Arizona 



One adult male from s. w. Texas (Chisos Mts.) 



Eight adult males from Chihuahua (5), Sonora (1), and Coa- 

 huila (2) 



Five adult males from Guerrero (3), Durango (1), and Guana- 

 juato (1) 



FEMALES. 



One adult female from s. w. Texas (Chisos Mts.) 



Two adult females from Arizona 



Five adult females from Chihuahua 



Five adult females from Jalisco (2), Durango (1), and Guerrero 

 (2) 



166.5 

 169 



167.3 



164 



163.5 



162 



161.7 



162.3 



123.1 

 134.5 



123.9 



124 



123 

 120 

 121 



121.9 



14.7 

 15.5 



14.2 



14.8 



13.5 

 14 



15.5 



16.8 

 18.5 



16.6 



16.8 



17.5 

 17.2 

 16.3 



17.1 

 19 



16.5 



17 



17 



17.5 



16.9 



16.8 



