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NEW YORK STATE MUSEUM 



majority of the species of the accipitrine forms, and we are in a 

 position to present some observations upon the way these birds are 

 probably related to each other, in so far as this system of their 

 anatomy seems to indicate. 



I am inclined to the following arrangement, as a provisional one. 



SUPERSUBORDER ACCIPITRIFORMES 



(United States) 



Accipitres 



SUBORDER SUPERFAMILIES FAMILIES SUBFAMILIES GENERA 



r I Elanoides. . . , 



I Milvidae 1 Milvinae j -^ Elf.^f|; ; ; ; ; 



t 4 Rostrhamus. 



I I Circinae i Circus 



1 Accipiter. . . 



2 Astur 



I Parabuteo . . 



I Falconoidea . . 2 Falconidae 



2 Accipitrinae.. 



3 Buteoninae . 



Buteo. 



3 Urubitinga . 



4 Asturina. . , 



5 Archibuteo. 



6 Aquila .... 



7 Thrasaetos. 



8 Haliaetus. 



4 Falconinae 



I Faico . 



S Polyborinae.. i Polyborus.. 



3 Pandionidae i Pandion . . . 



fi Gymnogyps 

 2 Cathartes... 



3 Catharista. . 



SPECIES AND 

 SUBSPECIES 

 E. forficatus 



E. leucurus 



I. mississippiensis 

 R. sociabilis 

 C. hudsonius 

 A. velox 

 A. cooperii 

 A. atricapillus 



A. a. striatulus 

 P. u. harrisi 



B. borealis 

 B. b. kriderii 

 B. b. calurus 

 B. b. lucasanus 

 B. b. harlani 

 B. lineatus 



B. 1. alleni 

 B. I. elegans 

 B. abbreviatus 

 B. albicaudatus 



sennettl 

 B. swainsoni 

 B. platypterus 



B. brachyurus 

 U. anthracina 

 A. plagiata 



A. 1. sancti-johan- 

 nis 



A. ferrugineus 



A. chrysaetos 



T. harpyia 

 f H. albicilla 

 \ H. leucocephalus 



H. 1. alascanus 



F. islandus 

 F. rusticolus 

 F. r. gyrfalco 

 F. r. obsoletus 

 F. mexicanus 

 F. peregrinus 

 F. p. anatum 

 F. p. pealei 



F. aesalon 

 F. columbarius 

 F. c. suckleyi 

 F. c. richardsoni 

 F. fusco-coerules- 



cens 

 F. tinnunculus 

 F. sparverius 

 F. s. phalaena 

 F. s. peninsularis 

 F. dominicensis 



F. paulus 

 P. cheriway 

 P. lutosus 



P. h. carolinensis 



G. californianus 



C. a. septentriona- 

 lis 



C. urubu 



This arrangement takes into consideration only the Accipitres of 

 the United States, thus omitting the families Serpentariidae and 

 Vulturidae. 



