Bui. 1267, U. S. Dept. of Agriculture 



Plate III 



The Rough-Headed Corn Stalk-Beetle and Species Likely to be 

 Mistaken for It 



i, i rontal view of head of larva of Euetheola rugiceps, showing the strongly punctate surface; 

 /:, frontal view of head of larva of Ligyrus gibbosus, showing its relatively smooth surface; (', 

 front ;l ■. lew of head of larva of Dyscinelus trachypygus, showing its strongly punctate surface; 

 I), ventral view of anal region of larva of E. rugiceps, showing median double row of modified 

 t'ii H" "n lit segment; E, ventral view of anal region of larva of D. gibbosus (note absence of 

 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 

 bri tie and relative coarseness of bristles); G, ventral view of anal region of larva of Phyllo- 

 phaga p., showing sharply differentiated median double row of modified bristles on last 

 ventral segment. (Photograph . by J. II Paine) 



