

Contents of Volume XXI. 



Alexander, C. P., 



Report on a Collection of Craneflies from the Colombian 



Andes taken by Mr. John Thomas Lloyd 193 



Aldrich, J. M., 



The North American Species of Lispa 126 



Banks, Nathan, 



Notes on African Myrmeleonidse 149 



Barber, H. G., 



Aquatic Hemiptera 29 



Bird, Henry, 



The Passing of the Hickory Nut? 123 



Davis, Wm. T., 



Dragonflies of the Vicinity of 'New York City, with a De- 

 scription of a New Species 11 



Two Additions to the List of New Jersey Cone-Headed 



Grasshoppers i77 



Felt, E. P., 



Gall Midges in an Aquatic or Semiaquatic Environment.. 62 



Descriptions of Gall Midges 213 



Forbes, Wm. T. M., 



An Artificial Table of the Species of Hadena Etc., of 



Eastern North America I79 



Grossbeck, John A., 



The Relation of Mosquitoes to their Environment 55 



Harris, Edw. D., 



Three New Cicindelids 6y 



Leng, Charles W., 



Aquatic Coleoptera 32 



LuTZ, Frank E., 



Factors in Aquatic Environment i 



Melander, a. L., 



A Synopsis of the Dipterous Groups Agromyzinse, Mili- 



chiinas, Ochthiphilinae, and Geomyzinse 219,283 



iii 



