Mr. R. Shelford’s Studies of the Blattide. 237 
lapponica, L. Supra-anal lamina shortly triangular ; ante-penulti- 
mate segment with posterior border notched ; sub-genital lamina 
produced, rounded, without styles, the sternum of the preceding 
segment represented by two lateral lappets, the central part concealed 
beneath the preceding sternum. 
Total length 13 mm.; length of tegmina 11 mm. 
GAMBIA. One example (Oxford Museum). 
This species is remarkably like Hetobia lapponica, L., the 
resemblance extending to the wing structure; the venation 
of the tegmina is however sufficient to separate the species. 
The following table shows the differences between the 
four known species of Z’heganopteryx from W. Africa :— 
1. Pronotum bordered with hyaline. 
2. Tegmina not black. 
3. Tegmina with 20 to 22 costal 
veins, wing venation different 
from that of HE. lapponica . . T. senegalensis, Sss. 
3’. Tegmina with 10 costal veins, 
wing venation exactly as in 
E. lapponica. . . . . . . LT. gambiensis, mihi. 
2). Tegmina black . . . .. . . ©. xthiopica, Sss. 
1’. Pronotum not bordered with hyaline . 7’. nitida, Borg. 
Blatta amena, W1k., f, appears to be the same as 7’ senc- 
galensis, Sss.. but the female is a species of Zemnopteryx ; 
a specimen from Natal under the same name in the British 
Museum is a distinct species of Zheganopteryx. I doubt 
if Blatta fulvipes, Wlk., can be separated from Blatta 
amena, Wlk., f. 
Theganopteryx xthiopica, Sauss. 
The form of the “ titillator” isshown in Plate XV, fig. 3, 
it is almost identical in 7h. senegalensis, Sauss. 
Genus HEMITHYRSOCERA, Sss. 
This is not a satisfactory genus, unless it is restricted to 
one species, /ist7i0, Burm., which has plumose antennze in 
both sexes, and exhibits a remarkable form of sub-genital 
lamina in the male; in the other species the antenne are 
inconspicuously pilose in the male sex and not pilose in the 
female, and there is really little to prevent the inclusion of 
