LOCAL DISTRIBUTION, OF INSECTS. 507 
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, 4. Limoniz, 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 (4. As- 
tragalt”), 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‘; and in the bells of the dif- 
ferent species of Campanula various bees may be cap- 
tured enjoying a luxurious repose’. Upon diving Verte- 
brate animals you must look for Pulices, Pediculi, Nirmi, 
Acari, and many Diptera, as Gistrus, Tabanus, Stomoxys, 
* Linn. Trans. ix. 78—. t.i. f. 20. b [bid. 55. t. 1. f. 12. 
° This insect does not, I believe, eat the petals of the rose, but 
Japs the nectar it produces. I have seen it employed upon wounded 
trees lapping the sap. -4 Mon, Ap. Angl. ii. 172. 257. 
