28 
gora, &c.; but for copious information upon this 
head, it suffices here to refer to the chapter on the 
geographical distribution of insects, in the fourth vol. 
of Mr. Kirby’s Introduction to Entomology. 
‘The insect climates,” he observes, “ or those in 
which certain groups or species appear, may be 
regarded as fixed by the will of the Creator, rather 
than as certainly regulated by any isothermal lines. 
Tournefort observed at the summit of mount Ararat 
the plants of Lapland; a little lower those of Swe- 
den; next, as he descended, those of Germany, 
France, and Italy; and at the foot of the mountain 
such as were natural to the soil of Armenia. The 
same has been observed of insects. Those that in- 
habit the plains of northern regions have been found 
on the mountains of the southern: as the beautiful 
and common Swedish butterfly, Parnassius Apollo, 
on the mountains of France, and prionses depsarius 
on those of Switzerland.” 
Latreille, after dividing the globe into twelve cli- 
mates, seven above and five below the equator, and 
subdividing these by lines of longitude, “ has also 
pointed out another index to insect climates, bor- 
rowed from the flora of a country. Southern forms 
in entomology,” he observes, “ commence where the 
vine begins to prosper. They are dominant where 
the olive is cultivated. Species still more southern 
are compatriots of the orange and palmetto. Some 
equatorial genera accompany the date, the sugar 
cane, the indigo and banana‘.” 
' Kirby and Spence, vol. iv. 
