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Leading Articles in Volume XV. 



Class I, Hexapoda ; Order I, Hymenoptera. 



Crawford, J. C, 



New North American Hymenoptera . . . .177 



Notes on Some Species of the Genus Halictus . -183 



Girault, a. a., 



Notes on Trichogramma pretiosa Riley. . . -57 



Trichogramma pretiosa Riley. Miscellaneous habits of 



the adult, with a list of hosts . . . . .117 



Class I, Hexapoda ; Order H, Coleoptera. 



Fall, H. C, 



New Genera and Species of North American Cerambycidse 80 

 Knab, F., 



Notes on Leptinotarsa undecimlineata Stal . . .190 



Girault, A. A., 



Biological Notes on Megilla maculata DeGeer . . 193 



Schaeffer, C, 



New Scarabaeidce ....... 60 



New Rhynchophora, H . . . . . -75 



Class I, Hexapoda ; Order IV, Diptera. 



Aldrich, J. M., 



Additions to my Catalogue of North American Diptera . 2 



Dyar, H. G., and Knab, F., 



Descriptions of Some American Mosquitoes ... 9 



New American Mosquitoes . . . . . .100 



Descriptions of New Mosquitoes from the Panama Canal 

 Zone . . . . . . . . .197 



Descriptions of Three New North American Mosquitoes . 213 



Jones, P. R., 



A Preliminary List of Nebraska Syrphidae with Descrip- 

 tions of New Species ...... 87 



