LOCAL DISTRIBUTION OF INSECTS. 519 
to subside, you may generally reap a plentiful harvest of 
various kinds. 
You see, now, how varied is the scenery to which the 
diversion of the Entomologist introduces him ; that he 
is never out of his way : whether on hill or in valley ; on 
upland or plain ; on the heath or in the forest ; on the 
land or on the water ; in the heart of a country or on 
its shores ; — still his game is within his reach. But in 
order to enable him to pursue it with greater prospect of 
success, he must recollect that not>only is every face of 
the country to be explored, but both the plants and the 
animals that it produces ; and that he must not turn with 
disgust from even the carcase or the excrement of the 
latter. As numerous species of herbivorous insects feed 
only on one kind of plant, the Entomologist, when he 
discovers a scarce one, should examine it with the hope 
of finding upon it a scarce insect. Sometimes it happens 
that only a single opportunity occurs in a man's life of 
seeing certain plants growing wild : such opportunities 
should never be neglected. Some insects also inhabit a 
plant in one district or season, and not in another. Thus 
the most beautiful of the Apions, A. Limo?iii a , though the 
plant it feeds upon usually abounds near the sea, I have 
discovered only on the northern coast of Norfolk; and an- 
other scarcely less beautiful, but more minute {A. As- 
tragali b ), though I have sought for it year after year, As- 
tragalus glyciphyllus being abundant near me, I never 
found but once. The blossoms of plants as well as the 
leaves must be inspected. In those of the rose, the Ce- 
tonia aurata is often taken c ; and in the bells of the dif- 
* Linn. Trans, ix. 78-. t. If. 20. b Ibid. 55. t. If. 12. 
c This insect does not, I believe, eat the petals of the rose, but 
