571 
[Scudder. 
per cent of the whole American fauna against nineteen and a half 
per cent in Europe ; the Pentatomidse twenty-four per cent in Amer- 
ica against twenty-five and a half per cent in Europe, these two 
striking contrasts combining to give the Lygseidse the total prepon- 
derance, hitherto enjoyed by the Pentatomidse ; the Coreidse twenty- 
two per cent in America against nine and a half per cent in Europe ; 
and the Capsidse nine per cent in America against ten per cent in 
Europe. 
TABLE IV. SUMMARY LIST OF KNOWN FOSSIL HETEROPTERA. 
FAMILIES. 
NORTH AMERICA. 
EUROPE. 
GENERA. 
SPECIES. 
GENERA. 
SPECIES. 
Corixidae 
2 
3 
1 
2 
Notonectidae 
1 
1 
1 
3 
Nepidae 
0 
0 
2 
4 
Belostomatidae 
0 
0 
1 
2 
Naucoridae 
0 
0 
2 
2 
Galgulidae 
1 
1 
1 
1 
Saldidae 
0 
0 
1 
1 
Veliidae 
2 
2 
1 
1 
Hydrobatida3 
2 
3 
2 
2 
Limnobatidae 
0 
0 
2 
2 
Reduviidae 
2 
2 
7 
14 
Nabidae 
0 
0 
2 
7 
Aradidae 
0 
0 
1 
5 
Tingididae 
3 
3 
4 
5 
Acanthiidae 
1 
1 
0 
0 
Capsidae 
7 
13 
13 
20 
Physapodes 
3 
3 
4 
21 
Lygaeidae 
26 
51 
6 
39 
Coreidae 
14 
34 
12 
19 
Pentatomida& 
16 
37 
14 
51 
Totals, 
80 
154 
77 
201 
Of the other smaller families, the only ones which surpass more 
than five known fossil species in all are the Nabidse with seven 
species and the Tingididse with eight ; of these there have been found 
