NATURAL SCIENCES OF PHILADELPHIA. 281 



Resolved, That the Academy, in the death of Thomas Nuttall, one of 

 its oldest Correspondents, is deprived of one of its brightest ornaments, 

 and the members of one of their most distinguished associates. 



Resolved, That the Academy has the highest appreciation of the 

 learning, and assiduous investigations of its late Correspondent, in the 

 wide field of American Botany, for which he has done so much. 



Resolved, That while we had been deprived of his presence among 

 us for a few years past, after so long a residence in this country, we 

 nevertheless constantly held him in our memory, as one of the brilliant 

 stars which illuminated our scientific horizon. 



October 25th. 

 Mr. Lea, President, in the Chair. 



Thirty-three members present. 



The report of the Biological Department for the present month was read. 



On report of a Committee of the Biological Department, the paper 

 entitled, Upon the Production of Cataract in Frogs by the injection of 

 large doses of sugar, by S. W. Mitchell, M. D., was recommended for 

 publication in a medical journal. 



The following papers were ordered to be printed in the Proceedings : 



Description of a New Species of UNIO from the Isthmus of Darien. 



BY ISAAC LEA. 

 Unio Avbryi. Testa sulcata, subtriangulari,. subventrico'a, inaequilaterali, 

 postice obtuse angulaa, antice subrotundata; valvulis cra^sis, antice crassiori- 

 bus, natibus subpromineutibus ; epidermide rufo-fusca, eradiata ; dentibus car- 

 dinalibus subcrassis, suberectis, valde crenulatis ; lateralibus ciassis subrec- 

 tisque ; mar gar it a alba et iridescente. 



Hab. Isthmus of Darien. Mr. Frederick Avery, per J. G. Cooper, M. D. 



Additions to the Coleopterous Fauna of Northern California and Oregon. 

 BY JOHN L. LE CONTE, M. D 



For the purpose of rendering the list of Coleoptera of North-western America, 

 published by me in the 11th volume of the Pacific R. R. Explorations and 

 Surveys, complete up to the present time, I have prepared this memoir 

 on the new species and synonyms observed since the printing of that memoir 

 in June, 1857. The catalogue portion of this paper will be inserted in the 

 edition of the above mentioned 11th volume, published for the authors, 

 which will thus contain a catalogue of all the species of Coleoptera known at 

 present, from western America, north of San Francisco. 



Descriptions of new species. 



Bembidium a p turn, nigro-ameum, parum convexum, nitidum, thorace 

 latitudine plus sesqui breviore antice angustato, lateribus rotundatis, angulis 

 posticis paulo obtusis, basi utrinque bifoveato, elytris striis 4 vel 5 internig 

 punctatis postice obliteratis, interstitio 3io bipunctato, humeris acutis, stria 

 marginali postice remota, antice confluente. Long. *25. 



Oregon, Mr. Davidson. Very nearly allied to B nitidum, but is larger 

 and has the striae of the elytra more finely punctured. The tibia? and tarsi are 

 wanting, but from the dark brownish color of the thighs I should infer that 

 they were piceous, 



1859.] 



