GENERAL DESCRIPTION OF THE TRES MARIAS ISLANDS. 13 



PLANTS DESCRIBED FROM THE TRES MARIAS. 



JEgiphila pacifica Greeiiman. 

 Seloperone nelsoni Greenmaii. 

 Buxus pubescens Greenman. 

 Cordia insularis Greenman. 



Gilibertia insularis Rose sp. nov. 

 Pilocarpita insularis Rose sp. nov. 

 Ternostroemia maltbya Rose sp. nov. (also 

 on mainland). 



Erythrina lanata Rose sp. nov. (also on Zanthoxylum insularis Rose sp. nov. 



mainland). 



Euphorbia nelsoni Millspaugh. 

 Euphorbia subccerulea tresmariw Millsp. 



var. nov. 



Zanthoxylum nelsoni Rose sp. nov. 



SUMMARY. 



The following statement shows the number of species of animals and 

 plants now known from the Tres Marias : 



Land mammals 11 



Birds 83 



Reptiles 18 



Fresh- water fish... 2 



Fresh- water shrimp 1 



Land mollusks 6 



Plants ..136 



ACKNOWLEDGMENTS. 



Much of the value of this report is due to the cordial cooperation of 

 several eminent specialists. Through the courtesy of Mr. F. V. Coville, 

 curator of the National Herbarium, Dr. J. N. Bose, assistant curator, 

 was enabled to prepare the report on the plants. Dr. Leonhard Stej- 

 neger, curator of the division of reptiles of the National Museum, 

 Dr. William H. Dall, honorary curator of the division of conchology, 

 and Miss Mary J. Eathbun, assistant in the division of invertebrates, 

 reported on the Tres Marias material; and Prof. B. W. Evermanu, 

 ichthyologist of the United States Fish Commission, kindly identified 

 the collection of fishes from the islands and the adjacent mainland. 

 Finally, I wish to express my great indebtedness to Mr. Robert Eidg- 

 way, curator, and Dr. Charles W. Eichmond, assistant curator, of the 

 division of birds in the National Museum, for having so freely placed 

 at my disposal, not only the material in their charge but also their 

 knowledge of tropical American birds. 



