BENEFICIAL INSECTS, PREDACEOUS AND PARASITIC 11 



thirteen black dots on its orange wing-covers. These larvae 

 and beetles are very common among the plant-lice on melon- 

 vines, and are an important factor in their extermination. They 



FIG. 2. The two-spotted ladybird (Adalia bipunctata) : a, larva; b, mouth- 

 parts of same; c, claw of same; d, pupa; e, adult; /, antenna of same; 

 all enlarged. (After Marlatt, U. S. Dept. Agr.) 



FIG. 3. The convergent ladybird (Hippodamia convergens) : a, adult; b, pupa; 

 c, larva; enlarged. (After Chittenden, U. S. Dept. Agr.) 



have also been noted for eating the black peach aphis and many 

 -other plant-lice. 



A form which is often very abundant among plant-lice on corn 

 is the Spotted Ladybird (Megilla maculata). The head, thorax, 

 and wing-covers are a dark pink, with two black spots on the 



