IDENTIFICATION OF INSECTS INJURIOUS TO CROPS 75 



securely webbing the food substance together, so that 

 it becomes matted; larval case and cocoon completely 

 hidden, covered with the food substance. Adults very 

 beautiful and delicately colored moths. — Meal Snout Moth 

 {Pyralis farinalis), p. 208. 



Beetles or Weevils. 

 (a) Small insects living in kernels of grain, or among grain and other 

 stored products. 



1. A very small, fat, humped-backed grub, in kernels of wheat or 

 corn; yellowish- white, legless, and wrinkled, unable to crawl; 

 pupa within the kernel. Adult smaller than a grain of wheat, 

 with a snout, and elbowed feelers attached to the snout. 



(i) Adult beetle chestnut-brown, without spots on its upper 

 wings. Slightly larger than the next, more common in the 

 North. — Granary or Black Weevil (Calandra granaria), p. 

 337- 



(2) Adult beetle somewhat duller brown than the preceding 

 with four reddish spots, one on each outer corner of the 

 upper wing. A southern species. — Rice or Spotted Weevil 

 (Calandra oryza). 



2. Small, more or less slender, somewhat flattened grubs, with dis- 

 tinct head and thoracic legs, crawling about in the debris of var- 

 ious grains or their products, or in vegetable foodstuffs. 

 Adults flattened, longer than wide, the head not prolonged into 

 a snout. They occur with the grubs, actively feeding. 



(i) Grub uniform in color, whitish, about one-fourth inch 

 long, slender, its head narrower than the first body segment; 

 pupa with the thorax not toothed laterally, but with most of 

 the abdominal segments bearing a tooth-like lobe, acute at 

 each outer corner and toothed along its sides. Adult beetle 

 active, smooth, elliptical, and reddish brown. — Confused 

 Flour Beetle (Tribolium confusum), p. 328. 



(2) Grub whitish, with a rectangular yellowish area on 

 each segment above, only the margin whitish as seen 

 from above; head broader than first body segment. 

 Pupa bears along each side of the thorax and abdomen 

 a series of stout lobe-like teeth, which are cylindrical- 

 rectangular and blunt. Adult beetle smaller than in the 

 preceding species, color dark chocolate-brown, sides 

 of the thorax saw-toothed.— 5flw-/oo//rc(/ Grain Beetle 

 (Silvanus surinamensis), p. 326. 



(3) Grub dull white with a dark brown head; fleshy, three- 

 fourths inch long; posterior end with two dark horny 

 points. Pupa white, adult beetle, elongate, depressed. 



