1971] 
Roth — Blattaria 
87 
hook is usually relatively slender and its tip in some species appears 
to be a distinct joint attached to the main body of the hook, or it is 
a more lightly pigmented point which blends into and is an integral 
part of R2 (Figs. 120, 123, 126, 129). Gurney (1965, p. 11) 
stated that in N. cinerea, H. procera , H. flexivitta, and II. tectidoma 
the genital hook differed . . in closeness of the apex to the oppo- 
site base, and in the position and shape of the flange near the base.” 
The flange (Fig. 72, f) is found in Leucophaea and J agrehnia, but 
may be poorly developed (Figs. 81, 105) or absent (Figs. 129, 
132, 135, 138) in some species of these genera. 
In Jagrehnia idonea and J . madecassa , R2 appears to be closer to 
the Gromphadorhini (see below) than to other species of Jagrehnia. 
Apparently the tips have been broken off (Figs. 132, 135, 138) and 
these resemble the damaged genital hooks (Figs. 155- 157) of Grom- 
phadorhina. The genital hooks of Jagrehnia can be arranged to show 
a trend from an elongated slender form (Fig. 111) to a stouter 
(Fig. 129) more robust shape (Fig. 138) approaching that found 
in the Gromphadorhini (Fig. 157). Jagrehnia idonea , J. madecassa , 
and Gromphadorhina spp. are all Malagasy species. 
3. Gromphadorinini ( Gromphadorhina Aeluropoda ) (Figs. 26- 
28, 140-157). In this tribe the retractable portion of R2 is unusually 
short and therefore cannot be extruded to the same extent found 
in other genera of Oxyhaloinae (and most other species of Blaberi- 
dae). The genital hook is robust, black, and the tip is lightly 
pigmented and resesmbles a nonarticulated segment. In Grompha- 
dorhina there is a distinct indentation on the inside margin between 
the tip and main body of the hook (Figs. 144 [arrow], 147, 150, 
153 ). 
The retractable portion of R2 (Fig. 1, ret) of males of Blattaria 
in which females mount and palpate his dorsum prior to copulation, 
is relatively long. Thus, the genital hook is extruded for a con- 
siderable length and is used in the initial seizure, or to pull down 
the female’s subgenital plate while she is above him. The short 
retractable portion of R2 in Gromphadorina probably is correlated 
with the difference in precopulatory behavior of this genus. In 
G. portentosa the female does not mount and palpate the male’s 
dorsum during courtship; the male simply backs into the female to 
make connection (Barth, 1968). Nothing is known about the mating 
behavior of Aeluropoda , but it may be similar to Gro?nphadorhina. 
