PEBFATORY NOTE. 



The second of the series of si)ecial bibliographies, which was begun 

 in 1883 by the publication of a catalogue of the published writings of 

 Spencer Fullerton Baird (Bulletin 20, U..S. Nat. Mus.), is now pre- 

 sented. 



±)r. Lea has contributed largely of his collections to the National 

 Museum, and it is therefore eminently fitting that his writings, based 

 upon this and similar material, should be published under Government 

 auspices. 



IV 



