1890 .] 
575 
[Scudder. 
ditions of the region in question have remained in the same rela- 
tive contrast to those of the other regions under comparison since 
oligocene times, or the present heteropterous fauna of the west 
shows a decided relation to that which existed on the same ground 
in tertiary times, or both. 
As in the Homoptera, and for the same general reasons, it has 
been found imperative to establish in the Heteroptera a large num- 
ber of new generic groups, to treat them on the same principles 
that guide the zoologist. Characteristics of structure in antag- 
onism to those prevalent in the same groups to-day run throughout 
large divisions or even families, and must be taken into account, 
if we are to do justice to the facts. Bringing these thus into 
prominence will serve the useful purpose of stimulating inquiry 
into their meaning and origin, which the data at present at hand 
seem inadequate to explain. Many of these 'extinct types at- 
tained a high degree of differentiation, a large number of the gen- 
era being represented by a half dozen or more species each, some 
of them at the time very abundant in individuals. 
A few words may be added concerning certain of the families. 
With the exception of a Miris, reported over half a century ago from 
Aix and never yet described, all the European fossil Capsidse 
known up to the present time are from amber. Thus Gravenhorst 
long ago referred half a dozen species from amber to Miris and 
Capsus, and Germar later described as many as thirteen species of 
Phytocoris from the same deposits. These genera were then used 
in a far broader sense than now, and the figures of Germar show 
at once that several genera are to be found among them. If we 
were to base our judgment on the comparisons with the modern 
species which Gravenhorst and Germar in nearly every case insti- 
tuted, we should reach the conclusion that the group Capsina alone 
had been found, and that no less than half the divisions which Reu- 
ter founded in this subfamily were present, and a large number of 
genera. Thus we find the Plagiognatharia, the Oncotylaria, Cyl- 
locoraria, Capsaria, Phytocoraria and the Loparia, a dozen genera 
in all, and there is at least one other genus among the species fig- 
ured by Germar, unaccompanied by comparisons with modern types. 
In America we have four of these divisions represented, viz. : 
Cyllocoraria, Capsaria, Phytocoraria and Loparia ; while Bryoco- 
raria, not recognized in amber, is also represented. In all, there 
are thirteen species, and all come from Florissant. 
