84 TlMEHRI. 
well investigated. Some of them are found under the 
bark of trees, others in fungi, and others in farinaceous 
substances such as corn, meal, and biscuits. The latter 
are known to science as Tenebrionidas or meal-worm 
beetles of which the Tenebrio molitor is the type. Most of 
the Heteromera hitherto observed in British Guiana 
have been placed in this family, but I believe that a care- 
ful scientific examination of the species met with here 
would be a benefit to Coleoptera. 
Beetles like butterflies undergo complete metamor- 
phosis, but the characters of their larvae and chrysa- 
lides vary very much, and the changes which take 
place during metamorphosis generally occur in the 
ground or under the bark of trees and are not readily 
observed. Unless one has extensive grounds and plenty 
of time and patience he is not likely to make much of 
observing beetles pass from one state to another. 
