the general
reader, however, he has placed the English name of each bird first, then
the scientific designation. The numbers correspond to the American
Check-List. By noting those omitted, the reader will readily discover
what species have not been found in Colorado.

1. =Western grebe.= AECHMOPHORUS OCCIDENTALIS. Rare migrant; western
species, chiefly interior regions of North America.

2. =Holboell's grebe.= COLYMBUS HOLBOELLII. Rare migrant; breeds far
north; range, all of North America.

3. =Horned grebe.= COLYMBUS AURITUS. Rare migrant; range, almost the
same as the last.

4. =American eared grebe.= COLYMBUS NIGRICOLLIS CALIFORNICUS. Summer
resident; rare in eastern, common in western Colorado; breeds from
plains to 8,000 feet; partial to alkali lakes; western species.

6. =Pied-billed grebe.= PODILYMBUS PODICEPS. Summer resident, rare;
common in migration; breeds in northern part of State; sometimes winters
in southern part.

7. =Loon.= GAVIA IMBER. Migrant; occasionally winter resident; not known
to breed in State.

8. =Yellow-billed loon.= GAVIA ADAMSII. Migrant; rare or accidental.

9. =Black-throated loon.= GAVIA ARCTICA. Rare fall and winter visitant.

37. =Parasitic jaeger.= STERCORARIUS PARASITICUS. Fall and winter
resident; rare.

40. =Kittiwake.= RISSA TRIDACTYLA. Rare or accidental in winter.

49. =Western gull.= LARUS OCCIDENTALIS. Pacific Coast bird; accidental
in Colorado; only one record.

51a. =American herring gull.= LARUS ARGENTATUS SMITHSONIANUS. Rare
migrant; range, the whole of North America.

53. =California gull.= LARUS CALIFORNICUS. Western species; breeds
abundantly in Utah; only three records for Colorado.

54. =Ring-billed gull.= LARUS DELAWARENSIS. Not uncommon summer
resident; common in migration; breeds as high as 7,500 feet; range,
whole of North America.

58. =Laughing gull.= LARUS ATRICILLA. Bird of South Atlantic and Gulf
States; once accidental in Colorado.

59. =Franklin's gull.= LARUS FRANKLINII. Rare migrant; range, interior
of North America.

60. =Bonaparte's gull.= LARUS PHILADELPHIA. Rare migrant; not uncommon
in a few localities; range, whole of North America.

62. =Sabine's gull.= XEMA SABINII. Rare winter visitant; breeds in the
arctic regions.

69. =Forster's tern.= STERNA FORSTERI. Rare summer resident; common
migrant; habitat, temperate North America.

71. =Arctic tern.= STERNA PARADISAEA. Very rare migrant; but two records;
breeding habitat,