Xll 



ILLUSTRATIONS. 



27. Foot of Longspur 



28. Head of Swift 



29. Head of Long-billed Curlew 



30. Bills of Frigate Bird, Hawk, Shrike, Vireo, and Bluebird 



31. Head of Black Skimmer . . . 



32. Spoon-billed Sandpiper . 



33. Head of Roseate Spoonbill 



34. Bill of Crook-billed Plover 



35. Diagram of Human Eye ..... 



36. The Eye of the Hawk and of the Owl 



37. Head of Goosander (male) ..... 



38. Head of Goosander (female) .... 



39. Head of Hooded Merganser (male) . 



40. Head of Red-breasted Merganser (male) 



41. Sharp-shinned Hawk 



42. Phoebe . . V 



43. Sooty Grouse . . 



44. Ruffed Grouse 



45. Nests of Eaves-Swallows 



46. Purple Martins ....... 



47. Pine Grosbeak 



48. Cuckoo 



49. Cow-bird 



50. Shrike . . . . . . . . 



51. Sparrow hung up by Shrike .... 



52. Centipede impaled by Shrike .... 



53. Robin 



54. Hermit Thrush 



55. Vireo 



56. White-throated Sparrow . 



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MAP, SHOWING ZOOGEOGRAPHICAL DIVISIONS OF THE WORLD 



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