577 
[Scudder. 
nearly seventy-three per cent of the whole, while in Europe it 
claims scarcely more than fifty per cent ; and again the Lygseina 
has less than sixteen per cent of the whole, while in Europe it 
has about thirty- five per cent; further, none of the other subfam- 
ilies which appear in Europe are found at all in America, our other 
groups being Geocorina, Oxycarenina, and Pyrrhocorina, and these 
find no place in Europe. But perhaps the most remarkable re- 
sult of the investigation of the American forms is the large number 
of new generic types found to be necessary in the Myodochina, 
where out of the twenty-one genera, only four (with but five species 
together) are regarded as identical with existing types. A remark- 
able feature to be noticed in them — not embracing all the species, 
but certainly most of them — is the brevity of the antennae, rarely 
half as long as the body, and usually much shorter than that. They 
are extraordinary, too, for their general resemblance as a whole 
to subtropical types. The members of the first group, the Myo- 
docharia, seem to form, with few exceptions, a type apart, in which 
the posterior lobe of the thorax does not broaden from behind for- 
ward, being as a whole narrower, or at least no broader, than the 
anterior lobe when the latter has ampliated sides, the opposite be- 
ing ordinarily the case in modern types. With a single exception 
or two they all come from Florissant. 
The members of the large family Coreidse do not appear to have 
been recovered from the rocks in any great variety of forms and 
from amber but a single species is known. The Coreina and Aly- 
dinae appear to have been far the most abundant among the sub- 
families, the former prevailing in Europe, the latter in America, 
where much the greater number of all the species, and genera as 
well, belong to the Alydinse, — a somewhat remarkable fact in view 
of their relatively slight importance to-day. The Corizidawere next 
in importance, a few species being found both in Europe and Amer- 
ica. The other subfamilies represented are the Pseudophloeina, 
occurring only in America, and in a single genus, which appears 
however, to have been very common ; and the Berytina, found only 
in Europe, and the only subfamily represented in amber. Except- 
ing one Corizus, all the American species that have been found have 
occurred onl}- at Florissant. None of the European fossil Coreina 
at all resemble in any particular manner the forms we find at Flor- 
issant, where all the species but one have to be referred to extinct 
genera and the one exception may require a similar reference when 
PROCEEDINGS B. S. N. H. VOL. XXIV 37 SEPTEMBER, 1890 
VOL. XXIV 
