Migration and Distribution of North American Birds. 185 



131. Mergus cucullatus, L, 



Hooded merganser. (Breeds.) 



132. Sterna hirundo, L. 



Common tern. 



133. Hydrochelidon lariformis, (L.) Coues. 



Black tern. 



134. Podicipes cornutiis, (Gm.) Lath. 



Horned grebe. 



135. Podi'ymbus podiceps, (L.) Lawr. 



Hell diver. 



Class III: Birds that are migratory but whose move- 

 ments through these counties seem greatly influenced by 

 changes of temperature. A moderate variation in our win- 

 ter would undoubtedly cause many individuals of these spe- 

 cies to become " winter residents " in this locality. 



1. Certhia familiaris, L. 



Brown creeper. (Breeds.) 



2. Sitta canadensis, L. 



Eed bellied nuthatch. 



3. Eremophila alpestris, (L.) Boie. (var. praticola, Henshaw, 1884) 



Horned lark. (Breeds.) 



4. Laoius borealis, V. 



Butcher bird. 



5. Carpodacus purpureus, (Gm.) Gr. 



Purple finch. (Breeds.) 



6. Astragal'nus tristis, (L.) Cab. 



Yellow bird. (Breeds.) 



7. Junco hiemalis, (L.) Scl. 



Snow bird. 



8. Spizella monticola, (Gm.) B^. 



Tree sparrow. 



9. Agelaeus phoeniceus, (L.) V. 



Red winged blackbird. (Breeds.) 



10. Scolecophagus ferrugineus, (Gm.) Sw. 



Rusty grackle. 



11. Corvus frugivorus, Bartr. 



Crow. (Breeds) 



