170 
flat, broadly and triangularly emarginate ; posterior lateral cal- 
losities large, oval; lobes high, inferior margin subemarginate, 
posterior angles truncate. Elytra and wings lobelike, very 
narrow. Anterior coxe subquadrangular, unarmed. Fore and 
middle legs much compressed, with five spines on each margin. 
Hind femora below with three to six internal and three to eight 
external minute spinelets (being different on the right and left 
side of the same specimen). Hind tibie slender, flattened above, 
with nine to ten internal and five to seven external, very minute 
spinelets. Ovipositor very short, much incurvel, apex obtuse, 
rounded. Subgenital lamina of female broadly transverse, very 
short, entire, posterior margin subsemicircular. 
The insect has the aspect of Ametrus, Br., but is quite different 
in many points, as shown by the following synopsis, which, at the 
same time, indicates the place of the genus in the system. The 
numbers refer to those in Brunner’s Monograph, 1888. 
3.3. Hind tibie spined. Tarsi very short. Elytra and wings 
lobelike. 
4. Hind tibize much incrassated. Fastigium of vertex broad. 
Antenne short. Fore and middle tibize below with 
two-three spines on each side. Ametrus. 
4.4, Hind tibie slender. Fastigium narrow. Antenne long. 
Fore and middle tibize with five spinelets on each side. 
Ametresomus. 
AMETROSOMUS HELMSI, spec. nov. 
Size moderate. Colour brownish, with dark brown bands. 
Face pale. Ocelliform spot circular, cream-coloured. Clypeus 
subsemicircular. Legs slender, pale. Two specimens. 
Female. 
Length of body os ae +. 2) om 
Length of pronotum ... wae ee ey 
Length of elytra A bie 4 3 
Length of hind femora ses ... 4 
Length of ovipositor ... si | SO 
Habitat.—Blyth Hills and Barrow ones, Central Australia, 
captured by Mr. R. Helms (Coll. 8.A. Mus.). 
B. STENOPELMATID. 
The STENOPELMATID# differ from all other Locustodea in the 
form of the tarsi, these being compressed instead of depressed, and 
the first and second joints do not possess any lateral lobes, so 
greatly developed in the Gryllacrids. Another character serves 
to separate them into two main groups, viz., the presence or ab- 
sence of pulvilli (cushions) on the underside of the tarsi, the an- 
