138 THE CANADIAN ENTOMOLOGIST. 



the most beautiful and graceful of butterflies, as well as the most 

 interesting. As representing most nearly the primeval butterfly, Papilio 

 machaoii, for instance, may still be considered as typical of the group in a 

 wide sense, no less than as typical of the particular family Papilionidce to 

 which it belongs. 



Dr. Chapman's paper must be read and studied to be fully appre- 

 ciated as it deserves. To drav/ attention to its merits, this brief notice is 

 penned. It adds largely to the store of scientific facts ; it is well and 

 clearly written, and is the product of a mind which not only seizes small 

 circumstances, but is able to build from them a theory of the way in 

 which Nature has gone to work, A. R. Grote, A. M. 



" A Manual for the Study of Insects," by John Henry Comstock and 



Anna Botsford Comstock, Ithaca, N. Y. Comstock Publishing Co., 



1895. (Price, $3.75.) 



This is a work of 700 pages, profusely illustrated. A table of the 

 classes of the Arthropoda is given, followed by a short characterization 

 of the Crustacea. Thirty-three pages are devoted to the Arachnida, and 

 a table is given for separating the principal families of the Araneida. 

 The Myriapoda are briefly referred to, and Chapter III. begins the 

 discussion of the true insects (Hexapoda). Nineteen orders are recog- 

 nized, and a careful table is given for their practical determination. 



In the remainder of the work, 618 pp., the several orders are treated, 

 with tables carrying the student to the families, each illustrated by typical 

 common species, of which brief accounts are given. 



In the Lepidoptera, Diptera, and Hymenoptera, the uniform system 

 of nomenclature of the wing-veins discussed by Prof Comstock in 

 " Evolution and Taxonomy " is applied throughout the orders. As stated 

 in the preface, but slight changes are made from the usual classification 

 of the families, except in the Lepidoptera, where the system proposed in 

 " Evolution and Taxonomy " is adopted with slight changes. This is 

 remarkably like Dr. T. A. Chapman's classification from pupal characters 

 and the present writer's one on larval characters. All three agree on 

 breaking up the old groups Zyga^nidas and Bombyces, and the several 

 members are referred to essentially the sames places. The work affords 



