336 University of California Publications in Zoology [Vol. 12 



to the north, are decidedly different from one another. The fauna 

 of the Trinity region could reasonably be expected to have resulted 

 from an intermingling of forms from all three directions. 



With a view to obtaining exact information pertaining to the 

 fauna and flora of this region, embracing a part of northeastern 

 Trinity County, southwestern Siskiyou County and a corner of 

 northwestern Shasta County, Miss Annie M. Alexander organized 

 and financed two trips, one in February and March, 1911, to Helena, 

 Trinity County, and another dvtring the summer months of the 

 same year, over the wider territory indicated in detail in the 

 following itinerary and on the map (fig. A, page 337). The specimens 

 obtained, numbering 449 birds, and 976 mammals, have been pre- 

 sented by Miss Alexander to the California Museum of Vertebrate 

 Zoology. The present report is based upon these specimens and is 

 supplemented from the field notes of the collectors. 



ITINERARY 



SCHEDULE 



Helena, Trinity County, February 11 to February 26, 1911. 

 Tower House, Shasta County, February 28 to March 8. 

 Mayten, Siskiyou County, June 3 to June 6. 



Scott River, 6 miles northwest of Callahan, Siskiyou County, 

 June 7 to June 14. 



Jackson Lake, Siskiyou County, June 15 to June 27. 

 Wildcat Peak, Siskiyou County, June 27 to June 30. 

 North Fork of Coffee Creek, Trinity County, July 1 to July 9. 

 Saloon Creek Divide, Siskiyou County, July 9 to July 10. 

 South Fork of Salmon River, Siskiyou County, July 12 to July 17. 

 Summerville, Siskiyou County, July 17 to July 19. 

 Hunters' Camp, Trinity County, July 19 to July 20. 

 Head of Grizzly Creek, Trinity County, July 20 to July 25. 

 Head of Rush Creek, Siskiyou County, July 26 to August 2. 

 Kangaroo Creek, Siskiyou County, August 3 to August 5. 

 Head of Bear Creek, Trinity County, August 5 to August 17. 

 Castle Lake, Siskiyou County, August 18 to August 23. 



