1882 .] 
409 
[Scudder. 
ries, but the families and especially the genera are very differently 
represented on the two continents. — Thus the Raphidiidae have 
in Europe only one species of Inocellia ; while on the other hand 
the Hemerobidae show one or more species each, of Nymphes, 
Sisyra, and Hemerobius. The Chry sopidae, as stated, are unrepre- 
sented, although two species are known from the Jura. The Pan- 
orpidae have one sjiecies of Panorpa and three of Bittacus ; while 
there are also two species of Ascalaphus and one each of Chau- 
liodes and Coniopteryx, belonging to families not found at Flor- 
issant. 
The Odonata furnish the first opportunity that my studies have 
afforded of a comparison between the insect faunas of Florissant 
and the Green River shales. The latter are placed directly below 
the former by Lesquereux and Cope, the only authors who have 
expressed a direct opinion. The Florissant beds have furnished 
six species in the perfect state besides two larvae ; the Green 
River shales four species in the perfect state besides fragments of 
another, concerning which nothing more can be said than that it 
probably belongs to the Libeliulina. Two of the Florissant forms 
belong to Aeschna, besides one of the larvae. All the remainder, 
four Green River species, and four from Florissant, besides a larva, 
belong to the Agrionina. The Green River shales are represented 
by one species of Podagrion and three species of Dysagrion, an 
extinct genus of the legion Podagrion allied to the genera Podag- 
rion and Pliilogenia ; the Florissant beds by two species of Agrion 
and two of Lithagrion, an extinct genus with the same alliances 
as Dysagrion ; the species of Agrion are not sufficiently perfect 
to decide into what subgenus they will fall, but they are certainly 
closely related and appear to be most nearly allied to Amphi- 
agrion or else to Pyrrhosoma or Erytliromma. All the Green River 
species belong then to the legion Podagrion while the Florissant 
species are divided between the legions Podagrion and Agrion. 
The resemblance of the faunas of the two localities is very ap- 
parent, though the species and even the genera are wholly dis- 
tinct. The facies of both faunas is decidedly subtropical. 
