﻿Field and Forest 



A MONTHLY JOURNAL 



DEVOTED TO THE NATURAL SCIENCES. 



Vol. II.— AUGUST 1876.— No. 2. 



Collection of Economic Entomology in the Gov- 

 ernment Exhibit at the Centennial. 



This collection, filling 24 cases or drawers, and numbering nearly 

 ,1,000 specimens, comprises the most common forms of the injurious 

 and beneficial insects of the United States. The collection is by no 

 means complete, but will serve to illustrate the plan of arrangement, 

 which is especially adapted to Cabinets of Agricultural Colleges, State 

 Museums and similar Institutions. 



The cases measure 16x21 inches and 2^ inches deep, outside meas- 

 urement. They are made of -whitewood or poplar, 3/% inches thick, 

 dovetailed at the corners, with the bottom rabbettedin; the sides are 

 made of two pieces, forming the box proper, about iy^ inches high, 

 and a cover one inch, which is grooved on the inner surface near the 

 top, (about j4, inch,) for the reception of a plate of glass, fastened in, 

 when the box is made, with putty. The cover and box, where they fit 

 together, are tongued and grooved, and are held together by brass 

 hooks and eyes on either side. 



The plan of arrangement is to show, in one group, the insect foes of 

 a certain food plant, in the four stages of egg, larva, pupa and insect, 

 accompanied by specimens exhibiting the mode of injury, and classified 

 according to the portion of the plant injured, as root, stalk, foliage or 

 fruit, to be followed by the beneficial insects known to destroy a par- 

 ticular species ; in short, the idea of such a collection is to be able to 

 show at a glance the entire history of any insect, or group of insects 

 affecting any of our food crops. 



