124 Bulletin American Museum of Natural History. [Vol. XXXI, 



over with pieces of cactus, the dried dung of burros and cattle and a bushel 

 of small stones. Another, just back of the beach and in the center of a 

 clump of cactus, was five feet in diameter and completely covered with peb- 

 bles and sea shells. Another among the mangroves on Magdalena Island 

 was six feet in diameter and composed entirely of mangrove twigs. Its 

 base was well secured among elevated mangrove roots and more than a foot 

 clear of the marshy ground beneath. There must have been a score of 

 wood rat nests among the mangroves on Magdalena Island within a radius 

 of 500 yards and many of the structures were five feet high. Any kind of 

 portable object in the vicinity of a wood rat's nest may be used in its com- 

 position. 



27. Neotoma intermedia gilva. Rhoads. Yellow Wood Rat. 

 Female, San Bartolome Bay, March 14. 



28. Neotoma intermedia pretiosa Goldman. Matancita Wood Rat. 

 Five males, 3 females, Santa Margarita Island, March 19-21. 



29. Neotoma intermedia arenacea Allen. Cape Wood Rat. 

 Three males, 2 females, Cape San Lucas, March 24-25. 



30. Neotoma intermedia perpallida Goldman. San Jose Island 



Wood Rat. 



Five males, 1 female, San Jose Island, March 31-April 1. 



31. Neotoma intermedia Rhoads. Rhoads's Wood Rat. 



Female, Agua Verde Bay, April 2 ; 2 females, Mulege, April 5, Concep- 

 cion Bay, April 8; female, San Bernado Mountains, May 16; 2 juv., Mira- 

 flores, April 25-30. 



32. Neotoma intermedia vicina Goldman. Espiritu Santo Wood Rat. 

 Female, Espiritu Santo Island, April 19. 



33. Neotoma nudicauda Goldman. Carmen Island Wood Rat. 

 Two females, Carmen Island, April 3. 



