Orthoptera in the British Museum. 129 
but long, attenuate and acute. I propose, therefore, 
to separate it into a new genus Thisoicetrinus with the above 
characteristic and select Acridiwm dorsatum F.-W. as the 
genotype. 
8. Thisoicetrinus dorsatus (I'.-W.). 
1839. Aleridium] dorsatum Fischer de Waldheim, Bull. 
Soc. Imp. Nat. Moscow, p. 301. 
1853. Huprepocnenus fischeri Filber, Lotos, i, p. 98, no. 7. 
1876. Calliptamus dorsatus Fischer de Waldheim, Orth. 
Imp. Ross., p. 240, pl. 19, f. 2 (2 !). 
1876. Calliptamus pterosticha Fischer de Waldheim, 1.c., 
p. 244, pl. 16, f. 4 (3). 
1910, T[hisoicetrus| dorsatus Kirby, Syn. Cat. Orth., 1, 
p- 559, no. 2. 
1912. Thisoecetrus dorsatus Uvarov, Horae Soc. Ent. 
Ross., xl, N 3, p. 32, no. 84, fig. 3a. 
1914. [Thisoicetrus| pterostichus 1. Bolivar, Trab. Mus. 
Madrid, ser. Zool. N 20, p. 23. 
1914. [Thisoicetrus] dorsatus I. Bolivar, lL.c., p. 23. 
The correct synonymy of this species was established by 
me after studying Fischer de Waldheim’s type specimens 
in 1912, but Bolivar, in his recent revision of this group, 
has overlooked it and regarded 7’. pterostichus and T. 
dorsatus as two distinct species. 
British Museum specimens: Armenia (F'. Ostwald), 1 @ 
(bearmg Kirby’s label: “‘ Huprepocnemis punctata Kb. 
type”; this name has never been published); 8. Russia, 
Astrakhan (N. L. Sakharov), 1 9; N. Persia: Chanigin, 
Diala R. (P. Buxton), 1 9. 
Genus THISOICETRELLUS, g. 0. 
Closely related to Thisoicetrus. Antennae (3) reaching beyond 
the hind border of pronotum, flattened and slightly dilated in the 
middle. Frontal costa flat, slightly impressed below ocellum, 
strongly punctured, with lateral carinae smooth, parallel, very 
slightly divergent and disappearing towards the clypeus, strongly 
convergent to the vertex. Lateral ocelli placed near lateral margins 
of vertex. Fastigium of the vertex prominent with slight rhombi- 
form impression, without median keel. Pronotum with three keels, 
asin T'hisoicetrus ; prozona one and a half times as long as metazona ; 
hind margin widely rounded. Prosternal tubercle compressed in 
front and from behind, with lateral margins straight and parallel, 
TRANS. ENT. SOC. LOND. 1921.—PARTSI, 11. (OCT.) K 
