Scudder.] 
576 
[April 2, 
It thus appears that we may recognize among the fossils every 
one of the divisions instituted by Reuter that have any considera- 
ble present development of species, excepting only the Miraria, 
and to cover the possibilities of this also there are two species of 
Miris not referred to modern genera, one mentioned by Graven- 
horst from amber and one by Curtis at Aix. It may also be noticed 
that the assemblage of fossil forms shows as a whole a leaning 
toward American types, more noticeable, however, among the 
American than the European forms, the more striking being in the 
development, of the Loparia and Bryocoraria. Not too much stress, 
however, should here be placed upon these considerations, as a re- 
examination of the amber types is necessary before positive con- 
clusions can be drawn, and the affinities of several of the Florissant 
forms is vague at the best. 
The family Lygseidae has been recognized in the secondary rocks 
by somewhat obscure fragments, in England and Germany, but in 
tertiary deposits the family is comparatively abundant and wide- 
spread. Curiously enough, only two species have been recorded 
from amber, and in Menge’s collection the family was represented 
by but one. Three-fourths of the known European species are those 
described by Heer, who referred them to few genera. It is diffi- 
cult to place the larger number of those which have been recorded, 
but, to judge in part by the living species with which some of them 
are compared, it is plain that the Myodochina should claim about 
one-half of them and the L^gseina the larger part of the remainder, 
the others being distributable among the Cymina, Blissina, and 
Heterogastrina. In all, there are thirty-seven species credited to 
six genera. 
In our own country, the numbers are largely in excess of this, 
fifty-one species being recognized, showing this family to have been 
one of the more important among tertiary Heteroptera. The dis- 
position of these in their respective subfamilies has been effected 
only by their evident affinities in general structure with existing 
members of these subfamilies, not by a demonstration of those defi- 
nite characters (mostly relating to the position of the stigmata) 
upon which these subfamilies were founded, as that would be im- 
possible. The result shows no small resemblance to the character- 
istics of the European tertiary fauna, the prevailing type being the 
Myodochina and the next the Lygseina, but beyond this the resem- 
blance fails to extend greatly, the prevailing subfamily having 
