196 
Annals of the Transvaal Museum. 
3 (4) The mesopleurae, metanotum, and base of abdomen, black. 
melanospilus . 
4 (3) Thorax and abdomen immaculate. 
5 (6) Apex of hind femora and upper part of pleurae black. 
pleurilineatus . 
6 (5) Legs and pleurae immaculate. 
7 (8) Front striated (pterostigma uniformly coloured, the legs 
coloured like the body). striatifrons . 
8 (11) Antennae entirely black. 
9 (10) A large black mark on the metanotum, the first abscissa of 
the radius shorter than the second, which is a little longer than 
the first transverse cubital. vannervis. 
10 (9) Metanotum immaculate, the first abscissa of radius longer 
than the second, which is as long as the first transverse cubital 
nervure. pallidipalpis . 
11 (8) Antennae at the most fuscous, the base of flagellum paler 
than the apex (the stigma pale, fuscous near the apex, the 
nervures fuscous). 
12 (13) Second cubital cellule distinctly narrowed towards the apex, 
one-half longer than wide, the basal two abdominal segments 
paler than the others. varicarinatus . 
13 (12) Second cubital cellule not narrowed towards the apex, twice 
longer than wide, the basal two abdominal segments not paler 
than the others. transvaalensis . 
Rhogas erythrostomus, sp. n. 
Rufo-testaceous ; the head, antennae, the third and following segments 
of the abdomen and the sheath of the ovipositor, black ; the oral region 
and the mandibles except the teeth, dark red ; the palpi black, covered 
with white pubescence ; wings hyaline, the costa pale, the stigma black, 
the nervures fuscous ; the legs coloured like the body, the apex of the hind 
tibiae and the four hind tarsi black. Female and male. 
Length, 8-9 mm. 
Pretoria. October. Tweefontein (Pretoria District). January. 
Covered with a short white pubescence, which is longest on the meta- 
notum. Face in the middle closely irregularly striated, almost reticulated, 
the sides punctured. Centre of front smooth and shining, the sides finely 
irregularly striated, the vertex opaque, coarsely alutaceous, more or less 
striated. Mesonotum closely, irregularly punctured, the scutellum more 
strongly punctured. The transverse depression at the base of the meta- 
notum stoutly crenulated. Metanotum closely rugosely punctured, the 
apical slope striated ; the keel hardly extends to the middle. Pleurae 
closely punctured, the apex of the propleurae striated. Basal two 
abdominal segments closely irregularly striated, more strongly in the 
centre than on the sides ; the central keel distinct ; the basal two-thirds 
of the third segment finely closely striated. 
The head is not quite transverse, the temples are rounded, narrowed, 
the occupit roundly incised. Parapsidal furrows narrow, shallow. The 
