ognize four somewhat 
a type slightly and va 
type, a Scarabid type, 
the weevils. In man: 
finitely the sort of con 
: distinc 
iriously 
and a 
ditions 
t types : the Campodeoid type, 
modified from the Campodeoid 
maggot-like type, like that of 
it is possible to determine de- 
that have produced the present 
3- 
tion 
Non( 
The div 
to the 
^ of the 
ision of k 
classifical 
classifica 
:ion of 
;o types seems to have no rela- 
adult insects into sub-orders, 
f adult beetles into sub-orders 
runs in any way parallel to the natural division of larvae into 
groups. The classification of the families of larvae does, how- 
ever, run parallel to the classification of the families of adults, 
so that it is usually possible to tell from the structure of a 
larva to what family it belongs. To this rule there are many 
exceptions, some of which are easily explained by differences 
in habit. The exceptions are most common in the low, de- 
graded types of larvae. The classification of families into 
with the classification of adults, though there are many ex- 
ceptions to this rule. The exceptions are such as to indicate 
that in some cases the adult classifications are at fault, and 
in other cases that there is really no parallel between the two 
stages. From this we can draw the conclusion that the pres- 
ent larval types of beetles are about as old as famihes but not 
much older. 
4. The amount of departure from the primitive larval type 
that any family of beetles presents, is no indication of the 
position in the scale of classification that the adults should 
occupy. At least this is true if we accept the classsification 
of adults recognized at present by our entomologists. 
5. Family characteristics are usually well marked in the 
larvae. Generic characteristics are also u.sually quite definite ; 
specific differences are usually very small and do not seem to 
6. There is in most cases an evident relation between the 
habits of the larvae of a family and those of the adults. This 
indicates that the habits acquired by one stage have subse- 
quently had their effect on the habits of the other stage. It 
seems probable that in beetles the larvae has been the first to 
modify its habits, and that the adult has subsequently acquired 
habits related to it. The larval stage seems thus to be more 
important than the adult ; at all events it is more thorough- 
ly protected, and is the first to be adapted to suit its sur- 
7. The larv« of beetles are much more diversified than their 
