1880.] NATURAL SCIENCES OF PHILADELPHIA. 363^ 



and the small numbers, slight excavations and apparently slug- 

 gish movements of their northern allies. And he could not for- 

 bear the thought that these New Jersey communities of Atta 

 septentj'ionalis seemed like the feeble remnant of a vigorous race 

 left or thrust by some untowai'd change upon unfavorable sites, 

 which must work toward their extinction. 



December 28. 

 The President, Dr. Ruschenberger, in the chair. 

 Eighty persons present. 

 The following papers were presented for publication : — 



