R. Shelford, New Blattidae. 12 
Genus Homalosilpha Stal. 
Homalosilpha cruralis sp. n. (Plate II fig. 8c.) 
2. Head piceous, a rufous band between the ocelli, labrum 
testaceous; antennae rufous. Pronotum discoidal, sides not de- 
flexed, greatest width behind the middle, anteriorly somewhat 
truncate , posteriorly very obtusely angled; testaceous, a curved 
irregular vitta on either side of the disc, two spots near the 
centre of the disc, posterior angles castaneous. Tegmina_ pro- 
jecting considerably beyond apex of abdomen, castaneous, the 
marginal area and apex much paler. Wings flavo-hyaline. Ab- 
domen above and beneath piceous, nitid, supra-anal lamina pro- 
duced, deeply and triangularly notched at apex. Cerci long, 
rufous. Legs with coxae and femora piceous, tibiae and tarsi 
bright rufous; front femora with a row of short spines on the 
distal half of the anterior margin beneath, no spines on the 
posterior margin beneath; mid femora with 8 short spines on 
the anterior margin, 4 long spines on the posterior margin beneath; 
hind femora with 6 short spines on the anterior margin, 4 long 
spines on the posterior margin beneath; formula of apical spines 
7, 4, 4, no genicular spines on front femora. 
Total length 26 mm; length of body 21 mm; length of 
tegmina 23 mm; pronotum 5,9 mm >< 8,1 mm. 
British Uganda (Grauer). 
The collection also contains a species of Homalosilpha from 
the Cameroons which corresponds exactly with Brunner’s de- 
scription of Periplaneta vicina (Nouy. Syst. Blatt. p. 236); the 
locality of the species was previously unknown. 
The genus Homalosilpha Stal differs from Pseudoderopeltis Kr. 
in both sexes being fully winged and in the absence of mem- 
branous projections from the meso- and metanotum; it differs 
from Periplancta Burm. in the form of the pronotum which is 
flat, the sides not being deflexed. Four species are known and 
they may be discriminated with the help of the following key: 
1. Pronotum somewhat hexagonal in outline, ustulata Burm. 
its greatest width at the middle. (Sunda Islands 
and Philippines. ) 
1’. Pronotum not as above, its greatest width 
behind the middle. 
2. Anterior margin of pronotum parabolic. 
3. Pronotum piceous, with lateral yellow decorata Serv. 
vittae. (Borneo. ) 
