— 85 



B. 



CC. 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. 

 D. Grub uniform in colour, 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 comer and toothed along its sides. Adult beetle 

 active, smooth, elliptical, and reddish brown — Confused 

 Flour Beetle (Tribolium confusum). 



DD. 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, colour dark chocolate-brown, sides 

 of the thorax saw-toothed — Sazv-tootlied Grain 

 beetle (Silvanus surinamensis). 

 Large insects, concealed in the bottoms of bins, corners, and the like, 

 feeding upon flour, meal or bran. Adults large black beetles ; the lar- 

 vae, large, cylindrical, wormlike creatures, resembling wireworms. 

 C. Adult not quite black in colour, shining, its third antennal joint not 

 quite twice as long as the second ; larva light yellowish, shining — 

 Yellozu Mcal-zvorm beetle (Tenebrio molitor). 

 CC. Adult black and without luster, its third antennal joint thrice as 

 long as the second ; larva very dark, shining — Dark Meal-zi'orm 

 beetle (Tenebrio obscurus). 



