Notices of new Sooks. 



17 



venational and antennal characters. All Aculeate Hymenoptera, 

 with few exceptions, have the antennae 12-jointed in the female, 

 and 13-jointed in the male, while in the Proctotrypidce such is not 

 the case ; either both sexes have the same number of joints, or 

 a less or greater number in the opposite sex. 



Before dealing with the systematic description of the 

 divisions, genera and species, Mr. Ash mead enters very fully 

 upon a description of the external structure, habits of the perfect 

 insects, transformations or life-history, distribution and classifi- 

 cation, subjects which occupy the first thirty pages of the volume. 



Proctotrypes, Latreille. 



Then follow detailed descriptions of all the species, with the 

 habitats, and an indication, in nearly every case, of the collection 

 in which the type or types are to be found. The volume 

 concludes with several pages of bibliography, which the reader 

 will find extremely useful. 



As a piece of thorough good work, and a valuable contri- 

 bution to entomology, it may be recommended as a model to 

 future monographers. 



