New Birds from Western Mexico. 9 



Averages of T. ambiguus goldmani. $ (4 specimens) : wing, 130.7 ; 

 tail, 153.2 ; culmen, 19.7 ; tarsus, 17. 9 (1 specimen) : wing, 134; tail, 

 167 ; culmen, 19 ; tarsus, 18. 



Nyctidromus albicollis insularis subsp. nov. Tres Marias Parauque. 



Type No. 156765, U. S. Nat. Mus., Biological Survey Coll., ad. J\ 

 Maria Madre Island, Mexico, May 10, 1897. Collected by E. W. Nelson 

 and E. A. Goldman. 



Description. The island birds can be distinguished from N. albicollis, of 

 the adjacent mainland, by uniformly duller, more grayish brown colors 

 of entire dorsal surface and broader transverse dark bars on lower sur 

 face, especially on abdomen and flanks. The culmen and tarsus are rel 

 atively shorter and wings and tail longer. Dimensions of type : wing, 

 173; tail, 169; culmen, 11 ; tarsus, 26. 



Averages of Nyctidromus albicollis (from mainland of Mexico). J* (5 

 specimens): wing, 158.4; tail, 146.6; culmen, 11.2; tarsus, 26.5. 9 (5 

 specimens): wing, 152.6; tail, 136; culmen, 11; tarsus, 25.9. 



Averages of N. albicollis insularis. $ (5 specimens) : wing, 170.6 ; tail, 

 162.4; culmen, 10.9; tarsus, 25.9. 9 (5 specimens) : wing, 168.4; tail, 

 154.4; culmen, 11.6; tarsus, 25.8. 



A notable feature of insularis, shown in the series before me, is its re 

 markable constancy of coloration compared with the amount of variation 

 in the large number of mainland specimens examined. The latter show 

 a wide range of color from grayish to rufous. A single specimen in the 

 island series has a slight rufous shading, but agrees with the others in 

 size. In the mainland series a specimen from Ixtapa, Jalisco, is colored 

 like insularis, but agrees with other birds from the same region in its 

 smaller size. 



Myiopagis placens minimus subsp. nov. Little Green Flycatcher. 



Type No. 156817, U. S. Nat. Mus., Biological Survey Coll., ad. J 1 , Maria 

 Madre Island, Mexico, May 10, 1897. Collected by E. W. Nelson and 

 E. A. Goldman. 



Description. Similar to M. placens, but grayer, especially about head 

 and neck ; top of head and neck lighter than rest of dorsal surface in 

 stead of darker, as in the mainland form. The island form averages 

 smaller than true placens. Dimensions of type: wing, 64.5; tail, 66; 

 culmen, 12; tarsus, 19.5. 



Averages of Myiopagis placens. $ and 9 (8 specimens) : wing, 68.2 ; 

 tail, 65.8; culmen, 11.2; tarsus, 19.1. 



Averages of M. placens minimus. ^ (5 specimens): wing, 64.9; tail, 

 64.8; culmen, 11.8; tarsus, 19.4. 9 (5 specimens) : wing, 65.5; tail, 63 ; 

 culmen, 11.6; tarsus, 19.2. 



In the National Museum is a typical specimen of placens taken on the 

 Tres Marias by Col. Grayson, showing that it occurs there as a straggler. 



