'With. Special Reference to Its Biological and Eco- 

 nomic Aspects 



By Justus \Sfatson Folsom, Sc. D. (Harv.) 



Instructor in Entomology at the University of Illinois. 

 Five Plates, i Colored, and 300 other Illustrations. 8vo; 485 pages. Cloth, $3.00 net. 



" ' Entomology,' by Dr. Justus W. Folsom, is an advance over all other 

 American works of its kind. It should be in the hands of every entomologist 

 or entomological student, and in every public library. A most careful 

 work, containing much information that only an expert has heretofore 

 known where to find." MR. F. M. WEBSTER, in charge of the Cereal and 

 Forage Crops Insect Investigations, Department of Agriculture at Washington. 



A comprehensive and concise account of insects, written to meet the growing 

 demand for a biological treatment of entomology. The aim has been to introduce 

 much material that, hitherto, has not appeared in the text -books; and though 

 adapted for students and teachers of entomology and zoology (being the only book 

 that fills the actual teaching requirements) it will also be valuable to the profess- 

 ional and amateur entomologists and to the general reader, especially on account 

 of its consideration of economic subjects. The book contains, in small compass, 

 authenticated facts that have had to be sought in many foreign languages. The 

 new illustrations, which are many, have been prepared by the author; the others 

 have been copied, by permission from various authoritative sources. 



Synopsis of Contents: Classification. Anatomy and Physiology. De- 

 velopment. Adaptations of Aquatic Insects. Color and Coloration. Adap- 

 tive Coloration. Origin of Adaptations and of Species. Insects in Relation 

 to Plants; to other Animals. Interrelations of Insects. Insect Behavior. 

 Distribution. Insects in Relation to Man. Literature. Index. 



"This is an eminently satisfactory work on insects, both from the 

 standpoint of the school and of the general reader. It is the first 

 adequate treatment of this subject as adapted to the science of 

 entomology, and at the same time to agriculture, horticulture and 

 forestry. It teaches every fact about insects that it is desirable to 

 know from the point of view of popular science, and literally all 

 that need be known from the economic. This is an admirable real- 

 ization of the dream of the schoolmaster and of the general reader 

 for a book at once comprehensive, concise and attractive." Journal 

 of Education, Boston. , 



"Of high, practical importance" (Outlook') "it is a complete and concise account 

 of insect life, planned to meet the growing interest in biology " (School). " The book 

 is a noteworthy one " (Psyche), " and is a very valuable addition to the general work 

 on the subject. It covers much ground not touched by the other books on insects " 

 (.Entomological News). " It is a book to lean upon and draw upon" (School Bulletin). 

 "Will be most useful to the general student" (Science). 



