CONTENTS OF TfflS NUMBER. 



Palmer, Miriam A. — Additional Notes on Heredity 

 and Life History in the Coccinellid Genus Adalia 

 Mulsant 289 



Hilton, William A. — The Nervous System of 



Thysanura 303 



Guthrie, Esther — New Mycetophilidae from 



California 314 



Cockerell, T. D. a. — Insects in Burmese Amber 323 



KwiNG, H. B. — Pathenogenesis in the Pear-Slug 



Saw-Fly 330 



Cramp^on, G. C. — A Phylogenetic Study of the Larval 

 and Adult Head in Neuroptera, Mecoptera, Diptera, 

 and Trichoptera 337 



ISELY, DwiGHT — A Synopsis of the Petiolate Wasps of 

 the Family Bumenidae (Hymenoptera), found in 

 America North of Mexico 345 



Carnochan, F. G. — Hololeptinse of the United States. 367 



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