Curculionidae 483 



temperature at which the culture is held, adults will appear. If the 

 weevils are removed daily the exact age of the adults will be known. 



Bibliography 



Back, E. A., and Cotton, R. T. 1926. The Granary Weevil. U. S. Dept. Agric. 



Dept. Bull. 1393. 

 1922. Stored Grain Pests. U. S. Dept. Agric. Farmer's Bull. 1260. 



(Revised 1931.) 



METHOD OF REARING CALANDRA* CALLOSA, 

 THE SOUTHERN CORN BILL BUG 



D. L. Wray, North Carolina State College 



AFTER the adult beetles are collected in the field the following simple 

 l method may be used to obtain and study the different life stages. 



The adults are sorted into pairs, each of which is placed in an 

 ordinary large-sized jelly glass or in a small-sized bell jar if records of 

 mass rearings are to be made. This is covered with a double thickness of 

 closely woven cheesecloth. Pieces of young, tender cornstalks are put 

 in the containers daily or whenever the food becomes stale. The adults 

 will feed on and lay eggs in these sections of cornstalk, which also fur- 

 nish sufficient moisture. If a daily egg record is to be obtained the 

 sections of cornstalk should be removed at a definite time each day as 

 the beetle has two main periods of egg laying activity, one from about 

 4-8 a.m. and one from 4-8 p.m. The pieces of cornstalk are removed 

 from the jelly glasses and the eggs may be picked out. 



For an incubation chamber, the ordinary 2-ounce tin salve box will 

 suffice. Place a piece of blotting paper in the bottom and place the 

 eggs upon it. The paper should be kept moist and the box kept in an 

 insectary. They should be watched daily to maintain the proper degree 

 of moisture. Great care should be exercised not to have any excess water 

 as this will be conducive to mold. The eggs will hatch in about 96-100 

 hours under favorable temperature conditions which average about 

 8o°-8s'° F. 



When the young larvae hatch they should be removed to rearing 

 boxes. The 4-ounce tin salve box will give very satisfactory results. 

 Split longitudinally small sections of cornstalk; in the center of each 

 half hollow out a cavity large enough to contain a young larva; place it 

 in this cavity and then bind the halves of the cornstalk section together 

 with a rubber band or a piece of string. Place the section of cornstalk 

 in the tin box and cover tightly with the lid. The moisture of the stalk 

 will be sufficient for the larva and the tin box will help preserve the 

 food. The cornstalk should be changed when it begins to dry out or 

 when the larva has completely hollowed out the center. 



*[ = Sitophilus.] 



