208 Psyche [Aug. -Oct. 
in the basal segments even when the latter become greatly re- 
duced in size. 
In Fig. 19, the terminal segments of the abdomen of the female 
roach are shown more enlarged than in Fig. 14, and uromeres 8, 
9, and 10 are shown more in detail, while in Fig. 21 the term- 
inalia of the male are shown more in detail. 
The tenth abdominal segment is essentially the same in both 
sexes, and its sternite is usually reduced or atrophied, while its 
tergite forms the huge epiproct ep or supraanal plate of Figs. 
14, 19 and 21. I suspect that the tergite of the eleventh segment 
unites with that of the tenth to form this large supraanal plate, 
but the embryologists claim that the eleventh abdominal seg- 
ment lies behind the plate in question. The epiproct ep is div- 
vided into a basepiproct or basal region and a postepiproct or 
terminal region which becomes divided into two lobes or epi- 
proctal lobes by a deep emargination or epiproctal cleft in its 
posterior margin. The membranous structure bearing the anal 
opening posteriorly is the protiger pro of Figs. 14, 19 and 21. 
In may flies and other primitive insects, the parapodial plates 
or paraprocts form the basal segment of the cerei; and as was 
pointed out in a former paper (Crampton, 1921) the paraprocts 
apparently represent the protopodite of a crustacean limb, in 
which the endopodite forms the cercus in insects. In the roach, the 
paraprocts or parapodial plates par of Figs. 14, 19 and 21, are 
large plates situated on each side of the anal opening, and they 
are divided by a lateral flange, or paracarina, into an upper and 
lower region. When the gynovalvular membrane, which forms 
a pouch for carrying the ootheca, becomes distended, as is shown 
in Fig. 16, it extends dorsal ward under the lateral flange of the 
paraprocts of the female, and this flange thus has an especial use 
in the female. 
At the base of and below the cercus ce of Figs. 19, etc., is the 
basicercus bee, which may represent a basal segment of the cercus. 
The cercus itself ( ce of Figs. 14, 21, 24, etc.) is a multi- 
articulate structure serving as a pair of hinder “antennse”, and 
is saifl to bear olfactory organs as well as the tactile organs usu- 
ally present in the cerci of insects in general. As is shown in 
Fig. 14, the cercus may be divided by a lateral ridge (cercocarina) 
