MUSEUM OF COMPARATIVE ZOOLOGY. 27 



to Prof. W. M. Wheeler of the American Museum of Natural 

 History for a critical revision of all our recent Formicidae and to 

 Mr. T. D. A. Cockerell for his study of a number of fossil 

 Hymenoptera ; the results of Mr. Cockerell's work are published in 

 Bulletin, Yol. 50, No. 2, June, 1906. 



The rearrangement of the Noctuidae has been continued. 



