304 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
F. Supra-anal plate in both sexes much exceeding sub-genital plate, 
with deeply cut hind margin (Fig. 26). Color castaneous, vdih 
obscure yellowish markings on pronotum. 
American Roach, Periplaneta americana, p. 312. 
FF. Supra-anal plate not exceeding subgenital plate, its hind margin 
divided in 9 , squarely truncate in cf (P"ig. 27). Costal margin 
of tegmina at base and disk of pronotum sharply marked with 
yellow Australian Roach, Periplaneta australasiae, p. 314. 
EE. Tegmina abbreviated. 
G. Arolia very small. Roaches of medium size; tegmina of female 
lateral, sub-triangular, scale-like; in male normal but covering 
only two-thirds or three-fourths of abdomen (Figs. 33, 41). Uni- 
form dark reddish brown. Pronotum 6.5 to 9 mm. wide. 
Oriental Roach, Blatta orientalis, p. 315. 
GG. Arolia large, fully half as long as claws. Pronotum 13 to 16 mm. 
wide. Very large adventive species with tegmina rudimentary 
in both sexes Eurycotis spp. 
DD. Medium or small species. Pronotum of female not over 7 mm. 
■wide; of male, less. 
H. Pronotum marked with two longitudinal fuscous stripes. A small 
species, in buildings, etc. (Fig. 38). 
German Roach, Blattella germanica, p. 310. 
HH. Pronotum brown, margined laterally (sometimes anteriorly) 
with yellow, which is continued on the costal margin of the 
tegmina (Figs. 29, 30, 36, 37). Usually found out-of-doors. 
Pennsylvania, or Bicolored Wood-roach, Parcoblatta pen- 
sylvanica, p. 308. 
HHH. Uniformly colored or nearly so; disk of pronotum often 
dusky in center. Out-of-door species. 
I. Female with tegmina much reduced, narrowly triangular wdth 
rounded apex, usually separated on mid-hne by a space one- 
third to one-half their width (Figs. 31, 35). Supra-anal plate 
of male convex posteriorly. Male yellowish brown; female 
blackish chestnut, very dark. 
Uhler's Wood-roach, Parcoblatta uhleriana, p. 307. 
II. Female with tegmina covering two-fifths to one-half of the 
abdomen, broad, meeting in mid-line (Fig. 32). Supra-anal 
plate of male produced, broadly triangular with rounded apex. 
Male yellowish brown; female chestnut-colored. 
Common, or Northern Wood-roach, Parcoblatta virginica, 
{). 306. 
AA. Middle and hind femora not armed as above. 
J. Prevailing color brown, tegmina pale, pronotum dark. Anterior margin 
of pronotum and base of costal margin of tegmina yellow. Nymphs with 
posterior half of abdomen rough above. 
Surinam Roach, Pycnoscelus surinamensis, p. 317. 
JJ. Prevailing color green. Adventive Green Roaches, Panchlora spp. 
