Page:Jardine Naturalist's library Entomology.djvu/212

surface, viz. the augmentation of their numbers with an increase of temperature:—^[1]

Countries.	Latitude.	Authorities.	No. of Species.
Melville Island, (Winter-Harbour.) $\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$	75°N.	Kirby,	0
Greenland,	60°-70° N.	O. Fabricius,	11
Lapland,	64°-71° N.	Zetterstedt,	813
Sweden,	56°-69° N.	Gyllenhal, Paykull,	2083
England,	50°-61° N.	Stephens,	2263
France,	41°-51° N.	De Jean and others,	4200
Brazil from Rio-Ja-neiro to Bahia, $\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$	13°-23° S.	De Jean, Klug, Perty, &c. $\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$	7500

In like manner may be exhibited, in a general way, the relative amount of the genera into which a given number of the species of certain countries, or entomological regions have been grouped:

Country.	Species.	Genera.	Average Number of species in each genus.
Siberia,	465	169	2,7
Europe,	5,677	715	7,9
North America,	2,403	541	4,4
South America,	8,112	1209	6,7
Africa,	2,942	674	4,3
New Holland,	320	162	2,0

Order II.—Orthoptera.

In immediate succession to the order of which we

1. In making this attempt, it was of course necessary that as nearly as possible the same extent of the different countries should be compared with each other.