CONTENTS 



Officers and committees for 1904 y 



Proceedings . .../.. vii-xi 



Synopsis of the Genera, Subgenera and Sections of the Family 



Pyramidellidae, by William Healey Dall and Paul Bartsch . . . 1-16 

 A New Lizard from the Rio Grande Valley, Texas, by Leonhard 



Stejneger -. . . . ." 17-20 



A Revision of the North American Mainlan d Species of Myiarchus, 



by E. W. Nelson ".. 21-50 



A New Batrachian from Sarawak, Borneo, by Thomas Barbour . 51-52 

 Hapl&mylomys, a New Subgenus of Peromyscus, by Wilfred H. Os 

 good ' ' ... 53-54 



Thirty New Mice of the Genus Peromyscus from Mexico and Guate 

 mala, by Wilfred H. Osgood . . ' 55-78 



Descriptions of Five New Mammals from Mexico, by E.A.Goldman 79-82 

 The Vegetative Vigor of Hybrids and Mutations, by O. F. Cook . 83-90 



New Plants from Nevada, by Aven Nelson . . 91-98 



A Decade of New Plant Names, by Aven Nelson 99-100 



General Notes . . . . 101-102 



Sonorella wofcottiana a correction, by Paul Bartsch, 101; The 

 species of Geum occurring near Washington, by Gerrit S. Mil 

 ler, Jr., 101 : Spelerpes porphyrificns in New Hampshire, by 

 Reginald Heber Howe, Jr., 102 ; Nnnnorchilus, new name for 

 Hemiura, preoccupied, by Robert Ridgway, 102; A preoccu 

 pied crab name, by Mary J. Rathbun, 102. 

 Descriptions of Seven New Rabbits from Mexico, by E. W. Nelson 103-110 



Notes on Tetraneris tinearifolin, by T. D. A. Cockerell 111-112 



Two New Subspecies of Tropical American Tyrant Birds, by Out- 

 rain Bangs 113-114 



Additions to the Orchid Flora of Florida, by Oakes Ames . . . 115-118 



Three New Orchid Species, by Oakes Ames 119-120 



Description of a New Species of Blind Eel, of the Genus Anguilla, 



by Hugh M. Smith 121-122 



Four New Grasshopper Mice, Genus Onychomys, by C. Hart Mer- 



riam 123-126 



Two New Pocket Mice of the Genus Perognathus, by Wilfred H. 



Osgood 127-128 



Two New Squirrels of the Aberti Group, by C. Hart Merriam . . 129-130 

 Jack Rabbits of the Lepnx campestris Group, by C. Hart Merriam . 131-134 

 Unrecognized Jack Rabbits of the Lrpus texianus Group, by C. Hart 



Merriam .... . . 135-138 



New and Little Known Kangaroo Rats of the Genus Perodipus, 



by C. Hart Merriam 139-146 



Descriptions of New Squirrels from Mexico, by E. W. Nelson . 147-150 

 Descriptions of Four New Birds from Mexico, by E. W. Nelson . . 151-152 

 Four New Bears from North America, by C. Hart Merriam . . 153-156 

 A New Coyote from Southern Mexico, by C. Hart Merriam . . . 157-158 

 A New Sea Otter from Southern California, by C. Hart Merriam . 159-160 



(iii) 



