30 
THE PLUM CURCULIO. 
DESCRIPTION. 
THE EGG. 
The egg of the plum curculio (see fig. 10) is rather broadly elliptical, dilute milky- 
white in color, the surface smooth and shiny; the micropyle is inconspicuous, and the 
ends indistinguishable. The length 
is variable; measurements of many 
specimens show a variation of from 
0.43 to 0.72 mm., with a range in 
width of from 0.35 to 0.45 mm. The 
average size of 30 eggs was found 
to be 0.643 by 0.411 mm. 
THE LARVA. 
W 
"When full grown — length 6 to 9 
mm., breadth 1.75 to 2.5 mm.; a 
yellowish-white, footless grub; 
nearly cylindrical, slightly flattened 
on ventral side ; body curved toward 
ventral side, bow-shaped; sides of 
each segment from second thoracic 
to eighth abdominal expanded into 
a fleshy lobe above and below a depressed lateral line. (See figs. 11 and 12 and PI. I, 
fig. 3.) 
Headsi8 broad as long, about 1 mm. each way; color nut-brown; epistoma, clypeus, 
labrum, and mandibles darker; epicranial suture and its continuation as a median line 
Fig. 10. 
-The plum curculio ( Conotrachclus nenuphar): 
Egg. (Original.) 
Fig. 11.— The plum curculio: Larva, showing structural details.— a, lateral aspect; b, ventral aspect; 
c , dorsal aspec t . ( O riginal . ) 
