INSECTS INJUEIOUS TO STOEED GKAIN. 



The Pea Weevil. 

 [Bruchus 2')is{, Linn.) 



The pea weevil is a small beetle about three-sixteenths of 

 an inch in length. It is of a dull gray color, with a few 

 markings on the back and occasionally a white spot on the 

 thorax. Figure 7 shows this beetle in its different stages 



enlarged, and with 

 the natural size fig- 

 ures near them. The 

 adult beetle lays her 

 yellow colored eggs 

 singly on the out- 

 side of the young 

 pea pod. As soon 



as the eggs hatch, 

 Fig. 7. Pea weevil ; b, adult ; c, full grown , , •,, •, , 



larva; d, pupa; g, pea showing exit hole. ^-^^^ ^'^^^^^ ^^^^* "'^^^ 

 Natural size indicated by smaller figures. through the pod and 



enter the peas. Here they feed, avoiding as a rule the 



germ, until full grown, when they cut a hole nearly through 



the seed coat, leaving a thin membrane over the burrow. 



The larvBB then turn to the pupa stage. But one insect 



can, or at least usually does, develop in a single pea. The 



adult beetle issues either in the fall or" more commonly in 



the spring. 



The Bean Weevil. 

 (Br2ichus ohtectus, Say.) 



The bean weevil is a small brownish beetle a little over 

 one-eighth of an inch in length. It resembles very much 



