1890 .] 
573 
[Scudder. 
The principal change which may be noted here is the almost total 
extinction of the Capsidae in the European representation, which 
shows but a single species ; the Saldidae and Hydrobatidse do not 
appear and the Aradidae are notably reduced. The greatest con- 
trasts between the European and American rocks, with an almost 
equal total number of species, are seen in the Capsidae which have 
eight per cent of the total fauna in America, six-tenths per cent in 
Europe, and the Coreidae with twenty-two per cent in America and 
eleven per cent in Europe. These are the only cases of striking 
contrasts in which the American fauna is the richer ; the others are 
the Reduviidae, one and three-tenths per cent for America, seven 
and four-tenths percent for Europe ; the Nabidae, none for America, 
three per cent for Europe ; and the Physapodes two per cent for 
America, eleven per cent for Europe. The contrasted balance of 
the Lygaeidae and Pentatomidae is well seen, America having thirty- 
three per cent of Lygaeidae and twenty-four per cent of Pentato- 
midae, Europe twenty-three per cent of the former and thirty-one 
per cent of the latter. 
Very little change appears in the smaller families (a relatively 
small number of which occur in amber), except in the entire absence 
of any representatives of Hydrobatidae and Saldidae, the former oc- 
curring in America. It is also surprising to see how little the larger 
families (with a single exception) are affected by the new table, 
amber having but the meagrest possible contribution to offer to the 
Pentatomidae, Coreidae, Lygaeidae, and Physapodes, while the sin- 
gle exception noted above, of the Capsidae, is a startling one, amber 
furnishing nineteen of the twenty European tertiary species. 
It may be worth while to extend some of these comparisons in a 
different direction, — that of existing American faunas. There are, 
I believe, but three opportunities for such comparison : first, Mr. 
Uhler’s “Check-list of the North American Heteroptera” (1886), 
which includes all species known at the time, including the Mexi- 
can and West Indian ; second, the same writer’s valuable “List of 
the Hemiptera of the region westof the Mississippi” (1876), which 
represents particularly the geographical region of our tertiary fos- 
sil Heteroptera ; and third, Mr. Distant’s contribution to the “Bio- 
logia Centrali Americana” (1880-89), which has a decidedly more 
southern aspect than Uhler’s general list. Distant’s work has pro- 
gressed only through the larger families, and indeed at this writ- 
ing the supplement to the first volume is not complete, and 
