174 



23. Cyanocitta Floridana California. Common. 



24. Contopus borealis. Rare ? 



25. Empidonax Hammondi. Common? 



26. E. obscurus. Abundant. 



27. E. flaviventris difflcilis. Rare? 



28. Stellula calliope. Common ? 



29. Picus albolarvatus. Common. 



30. Sphyrapicus varius ruber. Rare ? 

 81. S. thyroid eus. Rare. 



32. Melanerpes torquatus. Abundant. 



33. Canace obscura. Common. 



Of the species breeding on the eastern slope of the Sierra Nevada 

 (table "d"), only one Picus albolarvatus is peculiar to that range, 

 the remainder breeding on the mountains toward and beyond the 

 eastern limit of the Great Basin. Sialia Mexicana, Sitta aculeata, S. 

 pygmcea, Empidonax difflcilis and Sphyrapicus thyroideus, have not yet 

 been found anywhere in Nevada to the eastward of the Sierra, but 

 they occur among the nearly equally dense forests of the Rocky Moun- 

 tain ranges,* most of them being abundant in the Wahsatch range 

 of Utah. Several of these species thus repeated in the Rocky Moun- 

 tain system, are represented there by different geographical races, 

 as follows : 



SIERRA NEVADA. ROCKY MOUNTAINS. 



1. Turdus Swainsoni ustulatus. T. Swainsoni. 



2. Junco hyemalis Oregonus. J. hyemalis annectens. 



3. Zonotrichia leucophrys intermedia. Z. leucophrys. 



4. Passerella iliaca megarhynchus. P. iliaca schistacea. 

 6. Pipilo erythrophthalmus Oregonus. P. erythrophthalmus 



megalonyx. 



6. Cyanura Stelleri frontalis. C. Stelleri macrolopha. 



7. Cyanocitta Floridana Californica. C. Floridana Woodhousii. 



8. Sphyrapicus varius ruber. S. varius nuchalis. 



*See Birds of Colorado, Bull. Essex lust., v, Nov., 1873, p. 178. 

 [To be continued.] 



