102 Mr. B. P. Uvarov on 
of a lghter shade than the fascia; lateral lobes reddish 
brown, darker along the upper margin. . Elytra pale buff 
basally and hyaline apically, with the principal veins reddish 
brown. Wings hyaline, with the principal veins somewhat 
reddened basally and pale buff elsewhere. Hind femora 
on the outside brownish buff, with the lower part of the 
externo-median area yellowish (corresponding to the lateral 
fascia on the head, pronotum, and pleurz) ; the inside with 
a deep black fascia along the basal two-thirds of the lower 
margin, which emits several brown transverse fascie. Hind 
tibize of the general colour, beneath with the base and apex 
black ; the spines with the tips brown. 
? (type). 
mm, 
Length of body... 00.0 c- 57 
5 HeAC teee wel ecre 7 
, pronotum...... 8 
+ elyitae teas 25 
hind femora,... 20 
The unique type-specimen of this interesting insect was 
taken by Mr. F. de Klerk at Pretoria in April 1921, and I 
have much pleasure in dedicating it to the collector. 
Subfamily Locusrryz. 
2. Gdaleus gracilis, Sauss. 
1884, Gi[daleus] migrofasciatus var. gracilis, Saussure, Prod. Cidipod. 
p. 116. no. 8. 
CEdaleus nigrofasciatus, auctorum (nec De Geer), ox partim. 
This is one of the most common species of Gidaleus in 
South Africa, and it is quite distinct from the Palearctic 
O. nigrofasciatus, owing to the more slender habitus, smaller 
head, and, especially, the shape of the pronotum, which in 
O. ngrofasciatus is rectangular behind, while in O. gracilis 
it is obtusely rounded ; this form of the hind pronotal 
margin is intermediate between that in O. nigrofasciatus and 
O. senegalensis, in which the pronotum is widely rounded 
behind. Some more slender specimens of O. nigrofasciatus 
are very much like O. gracilis, but always easily separated 
by the shape of pronotum, and I believe that I am quite 
correct in restricting the name gracilis, applied by Saussure 
to both Palearctic and South African slender specimens, to 
the latter only, and I am sure that O. gracilis is a quite good 
species, though very closely related to O. nigrofasciatus. 
