,,; PREFACE. 



Dr. J. P. KiRTLAND. Northern Ohio. 



Gr. W. Fahnestock. Western Pennsylvania. 



Miss Valeria Blaney. Eastern Shore of Maryland. 



Dr. C. B. R. Kennerly. Northern Virginia. 



John H. Clark. Maryland, Texas, New Mexico, and Sonora. 



John Varden. District of Columbia and Louisiana. 



Dr. J. B. Barratt. Western South Carolina. 



Miss Charlotte Paine and Mrs. M. E. Daniel. Western S. 

 Carolina. 



Dr. S. B. Barker. Charleston, S. C 



Prof. F. S. Holmes and Dr. W. J. Burnett. South Carolina. 



R. R. Cuyler and Dr. W. L. Jones. Georgia. 



D. C. Lloyd. Eastern Mississippi. 



Dr. B. F. Shumard and Col. B. L. C. Wailes. Mississippi. 



James Fairie. Mexico and Western Louisiana. 



Capts. R. B. Marcy and G. B. McClellan, U. S. A. Red 

 River, Ark. 



Ferdinand Lindheimer. Central Texas. 



Col. J. D. Graham, U. S. A. The specimens collected while on 

 the U. S. and Mex. Boundary Survey, by Mr. J. H. Clark, viz., in 

 Texas, New Mexico, and Sonora. 



Maj. W. H. Emory. Specimens collected on the U. S. and Mexi- 

 can Boundary Survey, by Arthur Schott, at Eagle Pass, Tex., and 

 by J. H. Clark, in Texas and New Mexico. 



Gen. S. Churchill, U. S. A. Valley of the Rio Grande. 



Dr. L. Edwards, LL S. A. Northern Mexico. 



Dr. Wm. Gambel. New Mexico and California. 



Dr. John L. Le Conte. Littoral California. 



Dr. C. C. Boyle and J. S. Bowman. Central California. 



Dr. a. J. Skilton. Species collected in California by Henry 

 Moores, Esq. 



U. S. Exploring Expedition. Littoral California and Oregon. 



Academy of Natural Sciences of Philad. Various unique 

 specimens described by Dr. Holbrook. 



Boston Society of Natural History. California. 



SPENCER F. BAIRD, 

 Assist. Sec. S. I. in charge of Museum. 



Smithsonian Institution, ") 

 January 5, 1853. J 



