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INSECTS INJURIOUS TO STORED GRAIN. 



(After Girault, Bull. 156,, Illionois Ag. Exp. St.) 



A. Moths or inillers. 



B. Caterpillar small, whitish, living in grains of corn or wheat, pupating 



within the grain, and emerging through a round hole covered with silk at 



or near the tip of the kernel. Adult moths grayish clay-yellow, small — 



Angouinois Groin Moth (Sitotroga cerealella). 



BB. Caterpillars, spinning much silk, usually forming a silken tube to which 



the}- retire ; this tube covered with food particles. Living in flour, 



meal, chaff, sometimes among grain, or in food substances. Full-grown 



caterpillars make a cocoon. 



C. Caterpillar free-living usually not concealed within a silken tube, 



olive-green to pinkish, infesting grain or meal, webbing particles 



together, covering bags of grain with a web of silk and generally 



scattering silk in all directions. The moth is brown and gray 



Cocoon elliptical, slender, fragile and of clear silk — Indian Meal 



Moth (Plodia interpunctella) . 



CC. Caterpillars living in densely woven silken cases covered with 



particles of the food substance. Common in flour or chaff in 



corners. 



D. A yellowish white to pinkish caterpillar in flour, webbing it 

 together and forming a cocoon covered with particles of 

 flour. Aloth dark grayish — Mediterranean Flour Moth 

 (Ephestia kuehniella). 



DD. A soiled grayish caterpillar, darker at each end, living 

 in chaff or other vegetable debris in dark damp places, 

 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 coloured moths — Meal Snoiit- 

 Moth (Pyralis farinalis). 



AA. Beetles or weevils. 



B. Small insects living in kernels of grain, or among grain and other 

 stored products. 



C. A very. small, fat, humped-up grub, in kernels of wheat or corn: 

 yellowish-white, legless, very humpedebacked and wrinkled, unable 

 to crawl ; inconspicuous and yellowish brown ; pupa within the 

 kernel. Adult smaller than a grain of wdieat. with a snout, and 

 elbowed feelers attached to the snout. 



D. Adult beetle chestnut-brown, without spots on its upper wings. 



Slightly larger than the next, more common in the North — 



Granary or Black Weevil (Calandria granaria). 



DD. Adult beetle som.ewhat duller brown than the preceding 



with four reddish spots, one on each outer corner of 



the upper wnng. A southern species — Rice or Spotted 



Weevil (Calandra oxyzae). 



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