Hagen.] 276 [March 17, 



advocating the decimal system of book numbering which might be 

 modified from Mr. Dewey's classification. He gave in illustration 

 a decimal classification for a natural history library. 



General Meeting, March 3, 1886. 



The President, Mr. S. H. Scudder in the chair. 



Messrs. Henry Brooks, C. W. Jenks, Samuel H. Russell and Rev. 

 R. C. Winslow were elected Associate Members. 



Dr. Thomas Dwight read a paper on the significance of the in- 

 ternal structure of bone which will appear in the Memoirs, vol. 

 iv, no. 1. 



A life-size portrait of Mr. Alexander Agassiz, the gift of Mr. 

 Francis Parkman was shown, for which the thanks of the Society 

 were voted. 



General Meeting, March 17, 1886. 



Vice President, Mr. F. W. Putnam in the chair. 

 The following papers were read : 



MONOGRAPH OF THE HEMEROBIDAE. PART II. 



BY DR. H. A. HAGEN. 



The materials for a monograph of this family were prepared 

 long ago. After the revision of the literature published in the 

 Stettin Entomologische Zeitung, 1851, I collected the described 

 species in my Hemerobidarum synopsis synonymica (Stett. Ent. 

 Zeit., 1866). Both papers antedate the time of their publication ; 

 the first was concluded about three }^ears earlier, the second about 

 two j^ears. Some shorter papers followed the first : on Osmylus 

 published in 1852 ; on the Hemerobidae in amber, 1856(written in 

 1850) ; synopsis of the British Planipennes, 1858 ; the Ceylon 

 Hemerobidae, 1858-59 ; the North American Hemerobidae 1861 ; 

 on Coniopteryx, 1859 ; on Dilar, 1866. In my Synop. Hemer., 

 p. 370, I stated, that a description of the genital parts would 

 give better and more reliable characters for many species. Ram- 



