Notes on the Orthoptera in the British Museum. 107 
the genus Choroedocus, as I. Bolivar has proposed to name 
it, Stal’s name being preoccupied. 
Body rather compressed laterally. Head narrow, prominent. 
Frontal costa flat, slightly widened towards the clypeus and 
narrowed near fastigium of the vertex. The latter rather promi- 
nent. Vertex rather deeply triangularly impressed before the eyes, 
with slight short median longitudinal carina between eyes. Antennae 
filiform, in ¢ a little longer, in 2 shorter, than head and pronotum. 
Ocelli placed close to the eyes, nearer to the base of antennae than 
to the side margin-of the vertex. Pronotum compressed laterally ; 
median carina low, but acute; interrupted by three transverse 
sulci; prozona a little longer than metazona; lateral carinae 
straight, slightly divergent backwards. Prosternal spine long, 
curved backwards to the mesosternum, cylindrical, rather acute. 
Mesosternal lobes a little longer than broad in 3, nearly quadrate 
in 9; interspace in ¢ twice, in Q a little less than twice, as long 
as broad. Metasternal lobes in ¢ contiguous, in Q narrowly 
separated. Abdomen in ¢ inflated posteriorly; anal segment very 
large, its hind margin with rounded emargination in the middle 
and two short obtuse prominences at the sides of this emargina- 
tion; supra-anal plate large, impressed, with basal part rather 
narrowed, suddenly widened a little before the middle and widely 
lanceolate at the apex; cerci very large, slightly incurved, strongly 
compressed, with upper margin rather thick and rounded, while 
lower margin (as well as the hind) is very thin; inner surface of 
the cerci bearing an oval impression occupying the apical half and 
bearing scarce short hairs; subgenital plate a little longer than 
supra-anal, conical, slightly recurved, hairy. Hind femora attenuate 
in their distal third; hind tibiae with 12 spines outwardly (without 
an apical spine) and 10 spines inwardly; hind tarsi with short 
second joint. 
I. Bolivar regarded as belonging to this genus four 
species: Gryllus capensis Thunb., Acridiwm robustum Serv. 
(which he rightly treated as a synonym of Heleracris ducalis 
Walk.), Acridium sparsum Serv., and Demodocus amphi- 
prosopus Karsch. ‘The latter species, of which I have 
studied both sexes, does not belong to this genus, and a 
new genus, based upon it, is described below. Both 
Serville’s species are only known as yet from the female 
sex, and it is difficult to say if they actually belong here; 
I retain them in this genus only provisionally. On the 
other hand, two of Walker’s species of Heteracris are true 
