206 
SYSTEMATIC ARRANGEMENT. 
surface, viz. the augmentation of their numbers with 
an increase of temperature : — * 
Countries. 
Latitude. 
Authorities. 
■No. of 
2E 
Melville Island, ) 
(Winter-Harbour.) J 
75° N. 
Kirby, .... 
0 
Greenland, . . . 
60°-70° N. 
0. 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.iDe Jean and others, 
4200 
Brazil from Rio-Ja-\ 
neiro to Bahia, j 
13 a -23° S. 
De Jean, Klug, \ 
Perty, &c. J 
7500 
In like manner may he 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 Num- 
ber 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 
0,7 
Africa, .... 
2,942 
674 
4,3 
New Holland, . 
320 
162 
2,0 
Order II. — Orthoptera. 
In immediate succession to the order of which we 
* 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. 
