THE CABBAGE GALL WEEVIL. 21 



EXPLANATION OF PLATE IV. 



Fig. i. Burrows of the Ash Bark-beetle on ash sapwood. (Natural 

 size.) 



a. Mother galleries. 



b. Larval galleries. 



c. Pupal Chambers. 

 Fig. 2. The Ash Bark-beetle (Hy If sinus fraxini, Fabr.). 



THE CABBAGE GALL WEEVIL. 



Centhorhynchus sulcicollis, Gyll. 



Many correspondents in Worcester, Warwick, Shropshire and Staf- 

 ford have written respecting the damage done by the larvae of this 

 beetle. 



Some experiments were made with Vaporite on infected and un- 

 infected turnips, and although not perfectly successful, they indicate 

 that if this material had been put down earlier much better results 

 would have been obtained. 



FIG. 2. THE CABBAGE GALL WEEVIL. 

 i. Weevil. 2. Pupa. 3. Larva. 4-6. Galls. 



LIFE-HISTORY. 



The female deposits her eggs on the roots of cabbages and turnips, 

 or with her proboscis excavates small holes, into each of which she 

 usually places a single egg. In about ten days the larvae hatch out, 

 as short, thick, legless, yellowish-white maggots, and around each a 

 small swelling arises known as a gall. Within this the larva passes 



