28 Farmers’ Bulletin 1260. 
DARK MEALWORM.” 
The dark mealworm, as may be seen’ by the larva, pupa, and adult 
shown in figure 35, is very similar in form, size, and color to the yel- 
low mealworm, to which it is closely related.. The adult beetle differs, 
however, in being dull pitchy black, in contrast to the shiny or 
polished dark brown or black of the yellow mealworm. Its larva 
so closely resembles the larva of the yellow mealworm that it can 
be distinguished most easily by its much darker color. The two 
kic. 34.—The yellow mealworm. Four well-grown larve, two pupe, and the black adult 
beetle, with five kernels of wheat to indicate relative size. The larve when full grown 
are about one inch long and yellowish. The adult beetles are shiny black and slightly 
more than half an inch long. 
species of mealworm are often found associated, and what has been 
said of the stages of the yellow mealworm applies equally well to 
the dark mealworm. 
GRAIN AND FLOUR BEETLES. 
CADELLE.* 
The cadelle is an elongate, oblong, flattened, black or blackish 
beetle about one-third of an inch long. It resembles the mealworms 
17 Tenebrio obscurus Fab. “" Tenebroides mauritanicus L. 
