vi Proceedings of the Biological Society of Washington. 



Dragon-flies from the English Oligocene, by T. D. A. Cockerell 



and Hazel Andrews 89-92 



A New Tantilla from Mexico, by Thomas Barbour 93-94 



Preliminary Diagnoses of Fifteen Apparently New Neotropical 



Birds, by W. E. Clyde Todd 95-98 



New Plants from Oregon, by C. V. Piper 99-102 



Two New Ralliformes from Tropical America, by J. H. Riley . 103-104 

 Three Interesting Additions to the Crinoid Fauna of Sagami Bay 



and Suruga Gulf, Japan, by Austin H. Clark 105-108 



Descriptions of New Thysanoptera, by J. Douglas Hood .... 109-124 



General Notes 125-128 



Notes on the Genera Isothrix "Wagner and Phyllomys Lund, by 

 E. A. Goldman, 125-126; The Generic Names Epimys and 

 Rallus, by N. Hollister, 126; Preoccupied Names in the Genus 

 Andrena, by Henry L. Viereck, 127; The Status of Sigmodon- 

 tomys alfari Allen and Oryzomys ochraceus Allen, by E. A. 

 Goldman, 127; Note on the Name Corynorhinus megalotis, 

 by Oldfield Thomas, 127 ; Note on some Foreign Grasses, by 

 A. 8. Hitchcock, 128. 

 Ovis sheldoni, a New Mountain Sheep from Sierra del Rosario, 



Sonora, Mexico, by C. Hart Merriam 129-132 



Nineteen Apparently New Grizzly and Brown Bears from West- 

 ern America, by C. Hart Merriam 133-154 



A New Vesper Rat from Nicaragua, by E. A. Goldman .... 165-156 

 Descriptions of Three New Species of Amphipods from Southern 



California, by C. R. Shoemaker 157-160 



A New Mosquito from the Eastern United States, by Frederick 



Knab 161-164 



One New Genus and Five New Species of Ichneumon-flies, by 



Henry L. Viereck 165-172 



District of Columbia Diptera: Syrphidse, by Nathan Banks, C. T. 



Green, W. L. McAtee, and R. C. Shannon 173-204 



General Notes 205-208 



The Genotypes of Echimys and Loncherea, by J. A. Allen, 205- 

 206; The Type Species of Rattus, by N. Hollister, 206-207. 

 Two New Mammals from Sumatra, by Marcus W. Lyon, Jr. . . 209-212 

 The California Lowland Mink a Distinct Race, by Joseph Grinnell 213-214 

 Additional Notes on West Indian Reptiles and Amphibians, by 



Thomas Barbour ... 215-220 



Ampliibians and Reptiles from Tobago, by T. Barbour 221-224 



A New Brittle-star of the Genus Ophiomitra from Southern 



Japan, by Austin H. Clark 225-226 



A New Lizard of the Genus Sceloporus from Texas, by Leonhard 



Stejneger 227-230 



Index 231-236 



