Figures in italics represent the number of American species; in roman, of European.

CarboniferousP
e
r
m
i
a
n
.		T
r
i
a
s
.		L
i
a
s
.
U
p
p
e
r

J
u
r
a
.		O
l
i
g
o
c
e
n
e
.		M
i
o
c
e
n
e
.		T
O
T
A
L
S
.
L
o
w
e
r
.		M
i
d
d
l
e
.		U
p
p
e
r
.
Palæoblattariæ.
Mylacridæ—Mylacris10 ................10
Promylacris1 ................1
Paromylacris1 ................1
Lithomylacris2 2 ..............4
Necymylacris2 ................2
Blattinariæ—Etoblattina1 1 15+6 3+1 1 ........28
Spiloblattina........4 ........4
Archimylacris3 ................3
Anthracoblattina ..2 6 4 1 ........13
Gerablattina1 1 10 ............12
Hermatoblattina....1 1 ..........2
Progonoblattina....2 ............2
Oryctoblattina1 ..1 1 ..........3
Petrablattina1 ....1 2 ........4
Poroblattina........2 ........2
(23) (6) (41) (11) (10) (91)
Neoblattariæ.
Not yet
referred
to sub-
families.		Ctenoblattina..........1 2 ....3
Neorthroblattina ........4 ........4
Rithma..........2 10 ....12
Mesoblattina..........7 15 ....22
Elisama..........1 5 ....6
Pterinoblattina..........3 6 ....9
Blattidium............2 ....2
Nannoblattina............3 ....3
Dipluroblattina............1 ....1
Diechoblattina............2 ....2
Scutinoblattina........3 ........3
Legnophora........1 ........1
Aporoblattina..........3 6 ....9
(8) (17) (52) (77)
Phyllodromidæ—“Blatta”..............3 ..3
Periplanetidæ—Polyzosteria..............2 ..2
Panchloridæ—Zetobora..............1 ..1
Corydidæ—Paralatindia..............1 ..1
Heterogamidæ—Homœogamia..............1 ..1
Heterogamia................1 1
(8) (1) (9)
Grand totals23 6 41 11 18 17 52 8 1 177

Samuel H. Scudder.

APPENDIX.

PARASITES OF THE COCKROACH.

Spirillum, sp. [Vibrio]. Schizomycetes.

Rectum.

Ref.—Bütschli, Zeits. f. wiss. Zool., Bd. XXI., p. 254 (1871).