Scudder.] 
572 
[April 2, 
in America no Nabidse whatever, and the smaller half of the Tingi- 
didse. Other families not found in America are the Nepidse, Bel- 
ostomatidse, Naucoridse, Saldidse, Limnobatidse and Aradidse, all 
but the Saldidse having more than one species in Europe. On the 
other hand the only family found in America and not in Europe is 
the Acanthiidse with a single species. The remaining smaller fami- 
lies represented on both continents vary in their numbers from one 
to three in America and from one to four in Europe. 
If, however, we omit from this enumeration the forms which have 
been found in amber, and thus compare those of the rocks only, as 
in the following table, we shall meet with somewhat different results. 
TABLE y. TABLE OF FOSSIL HETEROPTERA FROM ROCK DEPOSITS. 
FAMILIES. 
NORTH AMERICA. 
EUROPE. 
GENERA. 
SPECIES. 
GENERA. 
SPECIES. 
Corixidas 
2 
3 
1 
2 
Notonectidaa 
1 
1 
1 
3 
Nepidas 
0 
0 
2 
3 
Belostomatidae 
0 
0 
1 
2 
Naucoridas 
0 
0 
2 
2 
Galgulidaa 
1 
1 
1 
1 
Saldidae 
0 
0 
0 
0 
Veliidae 
2 
2 
1 
1 
Hydrobatidae 
2 
3 
0 
0 
LimnobatidaB 
0 
0 
1 
1 
Reduviidae 
2 
2 
6 
12 
Nabidas 
0 
0 
2 
5 
Aradidas 
0 
0 
1 
2 
Tingididas 
3 
3 
3 
4 
Acanthiidas 
1 
1 
0 
0 
Capsidas 
7 
13 
1 
1 
Physapodes 
3 
3 
4 
18 
Lygasidas 
26 
51 
6 
37 
Coreidae 
14 
34 
11 
18 
Pentatomidas 
16 
37 
14 
50 
Totals 
80 
154 
58 
162 
