Bul. 1267, U. S. Dept. of Agriculture PLATE III 
THE ROUGH-HEADED CORN STALK-BEETLE AND SPECIES LIKELY TO BE 
MISTAKEN FOR IT 
A, Frontal view of head of larva of Euetheola rugiceps, showing the strongly punctate surface; 
B, frontal view of head of larva of Ligyrus gibbosus, showing its relatively smooth surface; C, 
frontal view of head of larva of Dyscinetus trachypygus, showing its strongly punctate surface; 
D, ventral view of anal region of larva of E. rugiceps, showing median double row of modified 
bristles on last segment; H#, ventral view of anal region of larva of D. gibbosus (note absence of 
any trace of a median double row of modified bristles on last segment); F, ventral view of anal 
region of larva of D. trachypygus (note entire absence of a median double row of modified 
bristles and relative coarseness of bristles); G, ventral view of anal region of larva of Phyllo- 
phaga sp., showing sharply differentiated median double row of modified bristles on last 
ventral segment. (Photographs by J. H. Paine) 
