140 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Rosthramus leucopygus (not Cymindes leucopygus Spix) Sharpe, Cat. Birds Brit. 

 Mus., i, 1874, 328, part ("Antilles"). 



Rostrhamus plumbeus Gurney, Ibis, 1879, 338, in text, part (Cuba), 341, part 

 (syn.). 



Rostrhamus sociabilis subsp. phimheiis? Gurney, List. Diurn. Birds Prc\', 1884, 

 85, part. 



Rostrhamus sociabilis pliimbeits Swann Synop. Accip., pt. 3, 1922, 156, part 

 (Cuba).— Barbotjr, Mem. Nuttall Orn. Club, No. 6, 1923, 48 (Cuba; 

 habits). — American Ornithologists' Union, Check-list, ed. 4, 1931, 64, 

 part (distr.).— Peters, Check-list Birds of World, i, 1931, 201, part (distr.). 



Rostrhainus sociabilis levis Friedman N, Proc. Biol. Soc. Washington, xlvi, 1933, 

 199 (orig. descr.; distr.).— Bond, Birds West Indies, 1936, 72, in text, and 

 footnote (w. Cuba; Isle of Pines; crit.; descr.), 414; Check List Birds West 

 Indies, 1940, 21 (Cuba; locally common in w. Cuba; Isle of Pines, local 

 and rather rare); ed. 2, 1945, 21. — Barbour, Mem. Nuttall Orn. Club, ix, 

 1943, 36 (Cuba; food habits). 



Subfamily Accipitrinae: Goshawks, Bird Hawks, and Their Allies 



Accipitrinae Coues, Key North Amer. Birds, ed. 5,1903,657.— Hartert, Vog. pal. 



Fauna, ii, 1913,1087.— Peters, Check-List Birds of World, i, 1931, 205.— 



Wetmore, Smith. Misc. Coll., xcix, no. 4, 1940, 34. 

 Coracoids not overlapping at sternum; nasal septum not completely 

 ossified; upper portion of anterior face of tarsometatarsus with no 

 bony ring; outer (fourth) toe not reversible; claws graduated in size 

 from that of the hallux (largest) to that of the outer (fourth) toe 

 (smallest), not contracted to their under surface; deep plantar tendons 

 of type III; tendons of biceps not split; tensores patagii not pecuHar; 

 cervical vertebrae 13 to 14; caeca minute; palate desmognathous ; 

 sides of head densely feathered except around the eyes, which are 

 overhung by a bare superciliary plate of the lachrymal, and have a 

 bare space beneath the lower lid, the lores sparsely feathered; bill 

 without tooth or notch, but usually festooned, relatively short and 

 deep, its depth at base three-quarters as long as, equal to, or exceed- 

 ing the chord of the culmen, the nostril horizontally ovate to nearly 

 circular, relatively large; upper outline of cere strongly ascending 

 basally; \ving rather short and much rounded, the longest primary 

 exceeding the distal secondary by not more than two-fifths of the 

 length of wing; tarsus and toes variable in relative proportions, but 

 tarsus always longer than the middle toe and approximately equal to 

 the tibia in length; tarsus usually scutellate, but sometimes booted; 

 plumage relatively firm. 



Besides the large cosmopolitan genus Accipiter and the Neotropical 

 Heterospizias this subfamily includes three small genera of Old World 

 hawks: Erythrotriorchis Sharpe, Melierax Gray, and Urotriorchis 

 Sharpe. The genus Accipiter is one of the largest and most widely 

 distributed of all falconiform genera. 



