TAliLE OF CONTENTS. XI 



I'ttSC 



Key to the Species and Subspecies of Corvus 257 



1. Corvus corax principalis Ridgway 259 



2. Corvus corax sinuatus ( Waaler) 262 



3. Corvus corax clarioncnsis Rothschild and Ilartert 264 



4. Corvus cryptoleucus Couch 265 



5. Corvus aincricanns anierieanus Audubon 267 



6. Corvus ainericanus j)asruus Coues 269 



7. Corvus aineric-anus liesperis Ridgway 270 



8. Corvus anierit-anus caurinus (]^>aird ) 272 



9. Corvus ossifragus Wilson 273 



10. Corvus inexicanus Gmelin 275 



11. Corvus ])almaruiu Wiirttemberg 276 



12. Corvus niinutus < rundlach 276 



13. Corvus janiaicensis (Jiuelin 277 



14. Corvus nasicus Teinniinc'k 278 



15. Corvus lem-ognaphalus leucognaphalusDaudin 278 



16. Corvus leucognaphalus i-rythrophthaliHUs ( \Vurttt'inl)erg) 279 



( it'uus 2. Nucifraga Brisson 280 



Key to the Species of Nucifraga 280 



17. Nucifraga columbiana (Wilson ) 281 



( ienus 3. Cyanocephalus Bonaparte 283 



18. Cyanocephalus cyanocephalus (Maximilian ) 284 



( ienus 4. Pica Brisson 286 



Key to the Species of Pica 287 



19. Pica pica hudsonia (Sabine) 287 



20. Pica nuttalli Audubon 291 



( ienus 5. Calocitta Gray 292 



Key to the Species and Sui)species of Calocitta 293 



21. Calocitta colliei (Vigors) 294 



22. Calocitta forinosa formosa (Swainson ) 295 



23. Calocitta fornio.sa azurea Nelson 296 



( ienus 6. Psilorhinus Riippell 298 



Key to the Species and Subspecies of Psilorhinus 298 



24. Psilorhinus niorio niorio ( Wagler) 299 



25. Psilorliinus inorio fuliginosus (Lesson) 300 



26. Psilorhinus niexicanus inexicanus Riippell 301 



27. Psilorhiiuis niexicanus cyanogenys (Sharpe) 301 



28. Psilorhinus inexicanus vociferus (Cabot) 303 



( ienus 7. Cyanocorax Boie 303 



29. Cyanocorax afiinis zeledoni Ridgway 304 



( ienus 8. Xaiithoura l>onaiiarte 305 



Key to the Sjjccics and Subspecies of Xanthoura 305 



30. Xanthoura luxuosa luxuosa (Lesson) 30(5 



31. Xanthoura ]uxuo.sa glaucescens Ridgway 308 



32. Xanthoura luxuosa vivida Ridgway 309 



33. Xanthoura luxuosa guatimalensis (Bonaparte) ">10 



34. Xanthoura luxuosa speciosa Nelson 311 



( ienus 9. Cissilopha Bonaparte 312 



Key to Species and Subspecies of Cissilopha 313 



35. Cissiloi)ha san-blasiana san-blasiana (Vigors) 313 



36. Ci.ssilopha san-blasiana ]>ulchra Nelson 314 



37. Ci.«silopha yucatanica ( Dubois) 315 



38. Cissiloi>ha beeclu'ii (Vigors) 316 



39. Cissilopha iiielanocyanea (llartlaub) 317 



