IV. LIST OF CONTRIBUTORS. 



Lea, Isaac. Description of twelve new species of Unionidse, from 



South America 33 



Notes on some members of the Feldspar Family 110 



Description of five new species of the Genus Unio 133 



Description of two new species of the Genus Lithasia 133 



Le Conte, Dr. J. L. List of Coleoptera collected in the Mountains of 



Lycoming County, Pa 346 



List of Coleoptera collected near Fort Whipple, Arizona, by Dr. Elliot 



Coues, U. S. A., in 1864-65 348 



Revision of the Dasytini of the United States 349 



Additions to the Coleopterous Fauna of the United States. No. 1 361 



Lincecum, Dr. G. A History of the "small bl ick erratic Ant" 101 



On the Agricultural Ant, (Myrmica Molefaciens) 323 



Meehan, Thos. On the Period and Ratio of the Annual Increase in the 



Circumference of Trees 292 



On the Consumption of Force by Plants in overcoming Gravitation 401 



Meek, F. B., and A. H. Worthen. Contributions to the Palaeontology of 



Illinois and other Western States 251 



Meigs, J. Aitken. Observations on the Cranial Forms of the American 

 Aborigines, based upon specimens contained in the Collection of 

 the Academy of Natural Sciences 197 



Reakirt, Tryon. Descriptions of some new species of Diurnal Lepidop- 



tera 238, 331 



Rominger, Dr. Carl. Observations on Chsetetes and some related Genera, 

 in regard to their Systematic Position ; with an appended descrip- 

 tion of some New Species 113 



