2B4 THK CAXADIAN KNT<»MoM>OIST. 



as nearly as possible, a natural sequence, while under these the species 

 are arranged in alpbabelical order ; 494 species and subspecies, besides 

 27 fossil species, are listed. 



Kortunalely but few ciianges in nomenclature have been found 

 necessary, the most important of these being the return to Kirby's use of 

 ^^rion and C(riiagrion for the genera commonly known as Calopteryx 

 and Agrion respectively. The change was well founded, according to the 

 decision of the Commission for the International Code of Zoological 

 Nomenclature, to whom Kirby's reasons for the changes were submitted. 



The references, among which all thai are of taxonomic value appear, 

 include also others relating to the descriptions of early stages, morphology 

 and distribution. 



In regard to types, the custody of which is given wherever possible, 

 the author has introduced two new terms, "Allotype " and " Morphotype." 

 The former is used to designate a type specimen of the opposite sex to 

 which the type (holotype) of a given species belongs ; while the latter is 

 em|)loyed for the second form of a dimori)hic se.x, as in the dimorphic 

 feiTJales of many C\cnagrionin:i>. 



The only feature in this excellent catalogue which we would criticise 

 is a tendency to unduly restrict the distribution of many of the species. 

 Many species, e. g., are designated "Transition " or " Carolinian," which 

 have been recorded from well within the limits of the Canadian zone, and 

 in many cases are characteristically boreal. I hesc northern records 

 should not be ignored, for frccjuently they do not indicate the extreme 

 noiihern range of the species ; the more numerous southern records being 

 due merely to the more thorough exploration of the warmer localities. 



Catalogue ok Nearchc Spidkrs : iJy Nathan Hanks, Hull. 72, U. S. 

 National Museum, igto. 



This is a very valuable contributiDu lo iNortii .Vincruan .irachnology. 

 Twenty years I'avc lapsed since Dr. .Marx puplished his ('atalogne of ihe 

 described Aranew.* of temperate North .\uieiica ( Proc. U. S. Nat. Mus., 

 XII, 1890), and until now it has been a difticult matter indeed for the 

 student to post himself on the many species described since that time. 

 The present list includes 1.330 species, distributed through 270 genera. 

 Mr. Hanks's catalogue should considerably stimulate the study of our 

 spiders. — Kari. R. Cooi.idoe. 



Mailed Aufi^st 5(h, 1910. 



