19Wj 
Judd — Eutromhidium on Locust 
125 
ondary veins of the vannal region (Fig. 1 - Vs) . Snodgrass^ 
shows that when the wings of the locust are folded the sec- 
ondary vannal veins lie in troughs of the folds. Severing 
says of the attachment of the mites that “on the adult grass- 
hoppers, the favorite location is in the folds or plications 
of the hind wings.” He records that on an adult female of 
Dissosteira Carolina 175 mites were found attached to the 
body and appendages. On the specimen from Bayfield the 
mites were attached only to the hind wings. Some of the 
mites were softened in alcohol and when examined under 
the microscope proved to be six-legged larvae which re- 
sembled the figures of “active engorged” larvae shown by 
Severin (1944). 
’ 1935. Principles of insect morphology. McGraw-Hill Book Co., New 
York. 
" 1944. The grasshopper mite, Eutromhidium trigonum (Hermann), an 
important enemy of grasshoppers. South Dakota State College Agr. Exp. 
Sta Bull. 3. 
