MUSEUM OF COMPARATIVE ZOOLOGY. 163 



21. Zonotrichia leucophrys. Exceedingly numerous, even to a con- 

 siderable distance above timber line. 



22. Junco "caniceps." Common, ranging considerably above timber 

 line. 



23. Spizella socialis. Frequent about Montgomery. 



24. Melospiza LincoLuii. Very numerous along the Platte, and also 

 common lor some distance above timber line. 



ICTERID.E. 



25. Scolecophagus cyanocephalus. Common at Montgomery, and 

 ranges to the tops of the mountains. 



CORVIDJE. 



26. Perisoreus canadensis. Common. 



27. Cyanura Stelleri, var. macroloplia. More or less frequent. 



TROCHILID^I. 



28. Selasphorus platycercus. Common. Repeatedly seen about 

 the flowers far above timber line. 



PICID-ffil. 



20. Picus villosus. The variety Harrisii was more or less frequent 

 up to the timber line. 



30. Picoides americanus, var. dorsalis. Common up to the timber 

 line. 



31. Colaptes mexicanus. Common up to the timber line. 



FALCONID^I. 



32. Buteo sp. ? A large Buteo was frequently observed. 



by him presented to the Boston Society of Natural History. Of three males, one 

 (marked "young male ") differs but little from the Mount Lincoln specimens, it having 

 no ash on the head. Another corresponds very nearly in color with the so-called L. 

 griseinucha, and another nearly as well with the so-called L. liitoralis. Although these 

 birds may have been born at widely separated localities, it seems probable that some 

 of the differences whereon certain species of Leucosticte have been founded may be 

 only individual variations. It is to be noticed, however, that the amount of ash on the 

 head, and the intensity of the colors, vary with locality from the north southward; the 

 most southerly form having no ash on the head, the bill black instead of yellow, and 

 the red of a brighter tint than those from more northern localities. The type of L. 

 tephrocotis was a male, killed on the Saskatchewan in May (see Faun. Bor.-Am., II, 

 p. 266), in which the ash formed a narrow nuchal band. In L. griseinuclia, a more 

 northern form, the gray involves nearly the whole head and the throat; and in L. liitoralis 

 and campestris there is more gray on the head than in tephrocotis, and they also appear 

 to be more northern in their distribution. In view of these facts, it s?ems probable that 

 the Mount Lincoln specimens above described represent the smaller, brighter-colored 

 southern race, in which the ash on the head has entirely disappeared. 



