BACK V OLUMES OF PSYCHE 
The Cambridge Entomological Club is able to offer for 
sale the following volumes of Psyche. Those not mentioned 
are entirely out of print. 
Volumes 2, 3, 4, 5, 6, 7, 8, 9, 10 ; each covering a period 
of three years, $5.00 each. 
Volumes 12, 14, 17, each covering a single year, $1.00 
each. 
Volumes 18, 19, 20, 21, 22, 23, 24, 25, 26, each covering 
a single year, $1.50 each. 
Volumes 27, 28, 29, 30, 31, 32, 33, 34, each covering a 
single year, $2.00. 
Orders for 2 or more volumes are subject to a discount 
of 10%. 
Orders for 10 or more volumes subject to a discount 
of 20%. 
A set of all the volumes available (29 in all) will be sold 
for $58.00. 
All orders should be addressed to 
DR. F. M. CARPENTER, Associate Editor of Psyche, 
Bussey Institution, Forest Hills, Boston, 30, Mass. 

A KEY TO THE 
FAMILIES OF NORTH AMERICAN INSECTS 
By C. T. Brues and A. L. Melander 
A small number of copies of this book are still available. 
These are sewed so that they will open flat and bound in 
heavy paper covers. The cloth bound edition is completely 
exhausted. This book contains complete tabular keys for the 
determination of all the families of North American 
Insects, with citations of representative genera and of 
species of economic importance. Includes synonyms corre- 
lating the various names applied to families and other 
groups, a complete index, and a glossary of technical terms. 
Pronunciation of all names indicated in the text. Over 400 
specially drawn figures of representative insects or their 
anatomical details. Large octavo, 146 pages ; 427 illus- 
trations. 
Price, postpaid 75 cents. Address: C. T. Brues, Bussey 
Institution, Forest Hills, Boston, Mass., or A. L. Melander, 
College of the City of New York, 139th St. and Convent 
Ave., New York City. 
