XX BlOUMiK'AL SOCIETY OK WASHINGTON. 



COLORADO RIVER IN CALIFORNIA AND ARIZONA. (Spenno- 

 phihis nwhavcnsis and S. negledus}* Discussed by Mr. True. 



Dr. Cooper Curtice presented a paper entitled How ENTOZOA 

 CAUSE DISEASE. Discussed by Mr. Seaman, and Dr. Th. 

 Smith. 



Mr. F. W. True exhibited and discussed A SKULL OF A 

 FEMALE NARWHAL W T ITH TWO W : ELL-DEVEI,OPED TUSKS. 

 Discussed by Drs. Curtice, Merriam, Gill, and Messrs. Ward, 

 True, and Murdoch. 



Mr. L. O. Howard presented NOTES ON SPIDER BITES. t 

 Discussed bv Drs. Merriam, Fletcher, Smith, Marx, and Fox. 



ONE HUNDRED AND FORTY-SIXTH MEETING, 

 June i, 1889. 



The President in the chair, and thirty members present. 



Dr. C. Hart Merriam presented A REVISION OF THE 

 GRASSHOPPER MICE AND POCKET MICE WITH DESCRIP 

 TIONS OF NEW SPECIES. J Discussed by Mr. True. 



Mr. C. D. Walcott read a paper entitled DESCRIPTIONS OF 

 NEW GENERA AND SPECIES OF LOWER CAMBRIAN FOS 

 SILS. S 



* 1889. Merriam, C. Hart. Description of a new Spermophile from 

 vSouthern California \Spermophilus mohavensis~\. N. Am. Fauna, No. 

 2, Oct. 1889, 15-16. 



1889. Merriam, C. Hart. Description of a new Spermophile from 

 Northwestern Arizona \_Spermophilus neglect us^. N, Am. Fauna, No. 

 2, Oct. 1889, 17. 



t 1888. Insect Life, Vol. I, p. 347. 



j. 1889. Merriam C. Hart. Descriptions of two new species and one 

 new subspecies of Grasshopper Mouse, with a diagnosis of the genus 

 Onychomys, and a synopsis of the species and subspecies. <N. Am. 

 Fauna, No. 2, Oct. 1889, 1-5, pi. I and figs, in text. 



1889. Merriam C. Hart. Preliminary Revision of the N. A. Pocket 

 Mice (Genera Perognathus et Cricetodipus Auct.) with descriptions of 

 new species and subspecies and a key to the known forms. 'N. Am. 

 Fauna, No. i, Oct. 1889, 1-29, pi. i-iv. 



\ 1889. Proc. U. S. Nat. Mus. Vol. 12, pp. 34-46. 



