44 
NATURAL HISTORY. 
[EAST. ZOOLt 
legs are short; they are excellent swimmers, and often perch on trees ; 
the edge of their beak is generally toothed, and their throat dilated into 
a bag, in which they keep the fish as they catch them, to feed their 
young. The Darters ( Plotince , Case 162) have the bill lengthened, 
slender, broad at the base, much compressed, and acute at the tips, 
with the margins finely serrated; their neck very long and slender. 
They live in small flocks on the trees that overhang the rivers, &c. If 
alarmed they plunge directly into the water, swimming very deep, with 
the head only elevated above the surface. They catch fish by darting 
at them with their sharp bill and long vibrating neck. The Tropic 
Birds ( PhcBtonince , Case 162) have a long bill, broad at the base, and 
dilated towards the tip, compressed and acute, and the margins finely 
serrated ; the form of the body like the gulls, but with two lengthened 
middle narrow feathers. They are found in tropical climates, where 
they catch the fly-fish, &c., on which they prey. The Pelicans (PeZe- 
< sanince , Cases 162—166) have the bill long, straight, and the tip hooked; 
the skin below the base of bill naked, which in many species forms a 
large pouch. They inhabit the marshes and the sea coasts; their food 
consists principally of fish, &c. They build their nests in the trees. 
The following Table exhibits, at one view, the arrangement of the 
families of birds, and a list of the genera : the numbers indicate the 
Cases that contain them. 
Class IT. 
Ayes. 
Order I. Accipi- 
tbes, Lin. 
Fam. 1. Gypa'iidce. 
Gypaetos, 1. 
Fam. 2. Cathartidce. 
Neophron, 2. 
Cathartes, 3. 
Sarcoramphus, 4. 
Fam. 3. Vulturidce. 
Gyps, 5. 
Vultur, 6. 
Otogyps, 7- 
Gypoheirax, 7* 
Fam. 4. FalconidcB. 
<cu Aquila, 8-10. 
Limnaetus, 11. 
Spizaetus, 11. 
Morphnus, 11. 
Thrasaetos, 12. 
Herpetotheres, 12. 
Spilornis, 13. 
Circaetus, 13. 
Pandion, 14. 
Ichthyiaetus, 16. 
Helotarsus, 14. 
Haliaetus, 15. 
Haliastur, 17* 
b. Ibycter, 18. 
Daptrius, 18. 
Milvago, 18. 
Polvborus, 18. 
c. Craxirex, 21. 
Buteo, 19-21. 
Archibuteo, 21. 
d. Baza, 22. 
Pemis, 22. 
Gampsonyx, 22. 
Elanus, 22. 
Nauclerus, 22. 
Milvus, 23. 
Rostrhamus, 23. 
Cymindis, 23. 
Ictinia, 23. 
e. Heirofalco, 24. 
Falco, 24. 
Hypotriorchis, 25. 
Tinnunculus, 26. 
Erythrcpus, 26. 
Ieracidea, 25. 
Harpagus,26. 
Hierax, 26. 
/. Astur, 27* 
Micrastur, 27. 
Accipiter, 27. 
Micronisus, 27. 
g. Melierax, 28. 
Polyboroides, 28. 
Serpentarius, 28. 
Circus, 29, 30. 
Strigiceps, 30. 
Fam. 5. Strigidcs. 
a. Surnia, 31. 
Nyctea, 31. 
' Athene, 31. 
b. Scops, 32. 
Lophostrix, 32. 
Ketupu, 32. 
Bubo, 32, 33. 
Ascalaphia, 33. 
c. Syrnium, 34. 
Otus, 34. 
Ulula, 34. 
Glaucidium, 34. 
Nyctale, 34. 
d. Strix, 35. 
Phodilus, 35. 
Ord. II. Passeres, 
Lin. 
Div. 1. Fissirostres. 
Fam. 1. Caprinml- 
gidcB. 
a. Steatornis, 36. 
JEgotheles, 36. 
Batrachostomus, 
36. 
Podargus, 36, 37* 
Nyctibius, 37. 
b. Antrostomus, 36. 
Eurostopodus, 36. 
Lyncornis, 36. 
Chordeilus, 37* 
Caprimulgus, 37* 
Eleothreptes, 37. 
Hydropsalis, 37. 
c. Scotornis, 37* 
Macrodipteryx, 
37- 
Podager, 37. 
Fam. II. Hirundi- 
nidos. 
a. Cypselus, 38. 
Dendrochelidon, 
38. 
Pallene, 38. 
Acanthylis, 38. 
Collocalia, 38. 
b. Hirundo, 38. 
Progne, 38. 
Herse, 38. 
Cotyle, 38. 
Chelidon, 38. 
Fam. 3. Todida . 
а. Eurystomus, 39. 
Coracias, 39. 
Brachypteraeias, 
39. 
б. Todus, 39. 
c. Peltops, 39. 
Cymbirhynchus, 
39. 
Corydon, 39. 
Eurylainfus, 39. 
Psarisomus, 39. 
d. Hylomanes, 39. 
Momotus, 39. 
Fam. 4. Trogonida 1 . 
Priotelus, 40. 
Apaloderma, 40. 
Harpactes, 40. 
Calurus, 40. 
Trogon, 40. 
Fam. 5. Alcedinida. 
a. Chaunomis, 41. 
Tamatia, 41. 
Malaeoptila, 41. 
Chelidoptera, 41. 
Monasa, 41. 
b. Dacelo, 41. 
Todiramphus, 41. 
Tanysiptera, 41. 
Halcyon, 41. 
Ceyx, 42. 
c. Ceryie, 42. 
Alcedo, 42. 
Alcyone, 42. 
d. Iacamaralcyon,42. 
Galbula, 42. 
Iaeamerops, 42. 
