BUGS. 9 
“Although these insects are not so numerous in species as 
the Coleoptera, Diptera, or Hymenoptera, they far outnumber 
the Orthoptera and Neuroptera, and possibly also the Lepidop- 
tera. A large proportion of them have sober colors, agreeing 
well with bark, earth, rock, or other surface upon which they 
rest, and multitudes are easily overlooked because of their close 
resemblance to buds, processes, scales, and other objects that 
surround them; it is these peculiarities which have caused them 
to be difficult to recognize and have retarded their acquisition. 
But with the spread of more exact knowledge of their habits, a 
new impulse has been given to the study of the species, so that 
every expedition to unexplored regions returns with a quota of 
previously unknown forms. 
ca 
Fic. 4.—Stages of growth of atrue bug. Original. 
“Their metamorphosis (Fig. 4) is incomplete, excepting only 
the males of the Coccidze and a few forms closely related to them. 
After leaving the egg they generally change the outer skin four 
times, at intervals of a few days each, to become adults. Growth 
is thereby permitted, the wing-pads and body become one size 
larger, and there is only a slight difference to be noticed be- 
tween the young and the perfect insect. Nothing like the cater- 
pillar stage appears in the newly hatched creature, and there 
is no such differentiation as marks the larva, pupa, and imago 
of Coleoptera and the higher orders. The next stage to the 
adult is commonly called pupa, or nymph, but not because it 
is in any true sense equivalent to the pupa of other insects.”— 
Uhler. 
There are few great groups of insects that display such a 
wide range and diversity of structure and consequent habits as 
the Hemiptera, and for this reason it is rather difficult to give 
a classification. By some authors the order Hemiptera is 
