NATURAL SCIENCES OF PHILADELPHIA. 473 



The seven species recognized are diagnosed as follows (p. 865) : 



A. Majores : subtus albi fere unicolores. 



a. major, supra nigricans. 1. M. semitorquatus. 



b. minor, supra cinereus. 2. M. mirandollii. 



B. Minores : sup. subtus albi, dense transfasciati. 



a. dorso rufo, pileo cinereo. 



a", minor ; dorso dilutiore rufo. 3. M. ruficollis- 



b". major ; dorso saturatiore rufo. 4. M. zonothorax. 



b. dorso cinereo : pileo concolore. 



a", ventre imo et crisso albis immaculatis. 5. M. gilvicollis. 

 b". ventre imo et crisso cinereo transfasciatis : 



a>". dorso dilutiore cinereo. 6. M. leucauchen. 



b"'. dorso saturatiore cinereo. 7. M. guerilla. 



The synonyms assigned the several species are as follows : 



1. M. SEMITORQUATUS (p. 365). 



Sparvius semitorquatus, Vieill. 

 Sparvius melanol&ucus, Vieill. 

 Falco brachyplcrus, Temm. 

 Falco leucomelas, Licht. 

 Carnifez naso, Lesson. 

 Falco perco7itator, Cabot. 



2. MlCRASTUR MIRANDOLLI (p. 365). 



Astur mirandollii, Schleg. 



Micrastur macro rhynchus, Pelz (1865). 



3. Micrastur ruficollis (p. 366). 

 Sparvius ruficollis, Vieill. 



Falco xanthothorax, Temm. 



4. Micrastur zonothorax (p. 366). 



Climacocercus zonothorax, Cabanis (1865). 



5. Micrastur leucauchen (p. 367). 

 Falco leucauchen, Temm. 



Micrastur gilvicollis, (adult) Pelzeln, Orn. Nov. 1865, 10. 



6. Micrastur guerilla (p. 367). 



Micrastur guerilla, Cass (1848). 



Micrastur concentricus, Scl. P. Z. S. 1856, 285. 



Micrastur gilvicollis, Scl. & Salv. Ibis, 1859, 218 ; Scl. P. Z. S. 1858, 96 ; 



1860, 96. Lawr., Ann. Lye. N. Y. vii. 317. 

 Micrastur xanthothorax, Scl. P. Z. S. 1857, 368. 



7. Micrastur gilvicollis (p. 368). 



Sparvius gilvicollis, Vieill., Micrastur gilvicollis, jr. Pelz. Orn. Nov. 



1865, 10. 

 Nisus concentricus, Lesson (1831). 

 31 



