18 
it would appear that this is the normal habit of the insect. Hence, 
althongh this species may do a certain amount of injury to grain, little 
fear need be felt of any serious damage, provided the grain be stored 
in a clean, dry, well ventilated place. 
THE CADELLE. 
(Tenebroides mauritanicus Linn.). 
The cadelle stands in a class by itself. It is almost as widely dis- 
tributed as any of the preceding species, and did it not differ from all 
of them (except the meal-worms), in being annual in development as 
well as in being partially predaceous, might rival them in point of 
injuriousness. 

FiG. 18.—Tenebroides mauritanicus: a,adult beetle with greatly enlarged antenna above; b, pupa; 
¢, larva—all enlarged (author’s illustration). 
The adult beetle, shown at fig. 18, a, is an elongate, oblong, depressed 
beetle, nearly black in color, and about one-third of an inch in length. 
The larva (¢c) is fleshy and slender, and measures when full grown nearly 
three-fourths of an inch. Its color is dull whitish, with a dark-brown 
head. The three thoracic segments are also marked with dark brown, 
and the tail terminates in two dark horny points. The pupa (shown at 
b) is also white. 
The statements of some of the earlier writers that this species is 
granivorous has been discredited by later authors. It has been experi- 
mentally proven by the writer, however, that the insect lives both in 
