BANGS AND PENARD: SURINAM BIRDS. 37 



30. Urubitinga urubitinga (Gmelin). 

 One adult cf", Vicinity of Paramaribo, December. 



31. Leucopternis albicollis (Latham). 

 One adult cf , Lelydorp, March. 



32. Spizaetus tyrannus (Wied). 

 One adult d^, Vicinity of Paramaribo, March. 



33. Herpetotheres cachinnans cachinnans (Linne). 



Five specimens, all adult, Vicinity of Paramaribo, February, 

 March, and September. 



Chapman (Bull. Amer. mus. nat. hist., 1915, 34, p. 638) has recently 

 described a small dark form from western Colombia as H. c. fulvescens. 

 He had three of the birds listed above for comparison, and describes 

 his new form as darker and smaller, mentioning also that the Mexican 

 bird is larger than true cachinnans. 



On comparing all our Surinam birds with six from southern Mexico 

 and Yucatan, we find the Mexican form decidedly paler and perhaps 

 a trifle larger. 



The difference is sufficiently great for separation, and the Mexican 

 form is named : — 



33a. Herpetotheres cachinnans chapmani, subsp. nov. 



Type.— M. C. Z. 60,743. Adult cT. Quintana Roo, Mexico, 

 22 January, 1912. J. L. Peters. 



' Penard Coll. 



