= 
2 
; 
“ss 
Sa 
149 
PLATE XV. 
Fig. 1. The Northern Corn Root Worm, Diabrotica longicornis, egg; 
enlarged eighty diameters. 
Fig. 2. Larva of same; enlarged six diameters. 
Fig. 3. Head of larva, dorsal view; greatly enlarged. 
Fig. 4. Labrum and leg of larva. 
Fig. 5. Mandible of larva, seen at right angles to cutting edge. 
Fig. 6. The same, seen obliquely from side. 
, Fig. 7. The same, seen directly from side. 
Fig. 8. Mouth parts of larva, seen from beneath. 
NOTE. 
The following figures are from drawings made by Miss Lydia M. 
erin espe kL: fis. 1, 2, 47; pl TET, fig. 1, Oe pl RV Ete sais 
pl: V>fig. 3, 4; pl. VI, fig. eS sepl eV tig. 2.055 6 pla VEL “and JERE 
pl. X, fic. 1-4, 6-8; pl. XI, fig. ee XIL, fig. 1, 3-8; pl. XIV, fig. 1. 
The drawings for pl. IV, fic. 1 REO sacle. fic. 12 Dy cs 65 .pl VI, fig. 
4-8; pl. VII, fig. 3, 4; pl. X, fig. 5; pl. aes fig. dbs lk au fig. 2: vl. 
XIII, fig. 1, 2; and pl. XIV, ‘fig. 2-5, were by Mr. M. Westergren ; and 
those for pl. XV, fig. 3-8, by Mr. H. Garman. PI. II, fig. 3; pl. ILI, 
igen Pl. NIL, fic. 3, are from Dr. C. V. Riley; and pl. II, 
fig. 3.7: pl. XIII, fig. 4-7 reopls MLW fe 6-55 and. pl XV. fie.) 432, 
are reprinted from previous reports of this office. 
