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Show 92 New York, forwarded his large and remarkably fine collection for study in this connection. Altogether, we have been euabled to examine and compare upward of four hundred specimens, including thirteen species, as follows:- List of species and specimens examined. 1. Nisas cooperi 5. JSisas chilends 6. Kisas chionogaster... 7. Nisns salviui 9. Nisus nigroplurobeus. 10. NisuB erythrocnemis. 12. Nmis tinus 13. Kisus collaris • s tf 75 • 2 ? 3 2 3 120 2ld 3 < i * 18 5 6 3 14 3 1 50 s « * 3 1 1 7 3 15 Boston Soc. 0 a 4 2 7 5 2 20 Corap. Zool. i a 3 1 9 13 a s 3 9 5 2 1 1 2 20 0. Salvin. a5 9 * 7 2 e 3 12 7 39 Vassar Collis go. a * l l i 9 * 6 2 e i P4 0 S 7 8 1 16 ' r oolloclions. 5 6 | 3 | 1 1 ' 1 7 5 h 12? 0 21 13 3 A Is 1 11 1 « IS 1 407 Of the above- named species, three are not included by Mr. Sharpe: N. gundlachi, being mentioned in a foot- note, and doubtfully referred to N. cooperi; N. nigroplumbeusy is referred to N. ventralis, while JBT. salvini is new, and first named here. On the other hand, there are two species of this genus which we have not seen, viz, N. giittatus and N. fringll hides, both of which appear to be perfectly distinct. Subgenera. Regarding subgeneric divisions of the above group of species, several have been proposed and named, but we are unable to make out more than two which are capable of definition; these two groups constitate quite distinct subgenera, and may be characterized as follows :- Nisus.- Five outer primaries, with inner webs emarginated; fourth or fifth quills longest; inner toe not reaching middle of second joint of middle toe. HIERASPIZIAS.- Four outer primaries, with inner webs emarginated; bird or fourth quills longest; inner toe reaching to or beyond middle f second joint of middle toe. SUBGENUS NISUS, CUVIBR. Jccipiler BRISSON, Orn. i, 1760,10.- Type, FaUo nisua Linn. ( = 2T. fnngillariH*). JVWII* CUVIKR, Lecons Anat. Comp. i, tabl. ois. 1709.- Same tvpe. Ierax LEACH, Syst. Cat. Mam. etc. Brit. Mus. 1816,10.- Same type. Cooperastur BONAPARTE, Rev. et Mag. de Zool. 1854, 538.- Type, Falco sUxnleui Aud. {= N. cooperi). • * Leptohierax SUNDEVALL, Diep. Ace. Hemeroharp, 1872, 24.- Same type. CHARACTERS.- Five outer primaries with inner webs emarginated; fourth or fifth quills longest; inner toe reaching scarcely beyond the first joint of the middle toe, or falling short of it. |