94 [April, 



SYNOPSIS OF THE BRITISH ORTHOPTEEA. 



BY ELAND SHAW, F.E.S. 



(^Continued from page 64). 



Tii.— PLATYCLEIS, Fiebcr. 



PlatycJeis differs from Tliamnotrizon chiefly in having the organs 

 of flight more or less developed, never squamjeform ; and the tooth ou 

 the internal border of the cerci in ^ is nearer the apex than the base. 

 The following remarks ou the genus will save repetition in the de- 

 scriptions of the species. 



Head with the vertex broad and rounded, ocellus scarcely visible. 

 Antennfe longer than the body, with the first joint broad and com- 

 pressed. Pronotum above flattish, with a more or less distinct median 

 longitudinal ridge ; side lobes inserted at a blunt angle. Presternum 

 unarmed. Elytra perfectly developed or abbreviated, never squmse- 

 form. Wings hyaline. All the femora unarmed below. Anterior 

 tibife with three spines above. Posterior tibia? with four apical spines 

 below ; first joint of the posterior tarsi with free plantules. Anal 

 segment in $ sulcate. Cerci in $ conical, with a tooth about the 

 middle or nearer to the apex. Subgenital lamina in 5 sulcate or 

 ridged longitudinally, with the lobes rounded or acuminate. Ovipositor 

 incurved, acuminate. 



Table of Species. 



1 (2) Subgonital lamina in $ longitudinally sulcate ; elytra and wings fully de- 



veloped 1. grisea, Fabr. 



2 (1) Subgenital lamina in $ longitudinally ridged ; elytra and wings abbreviated. 



3 (4) Ovipositor regularly incurved ; twice as long as the pronotum ; side flaps of 



the pronotum with a pale margin posteriorly ...2. brachyptera, Linne. 



4 (3) Ovipositor sharply incurved near the base ; not more than half as long again 



as the pronotum ; side flaps of the pronotum with a pale margin nearly 

 all round 3. i^oeseZi/, Hagenb. 



1. — Platycleis geisea, Pabr. 

 Locusta grisea, Pabricius, Ent. Syst., ii, p. 41. 

 Decticus griseus, Serv., Orth., p. 488. 

 Dec. {Flatycleis) griseus, Pischer, Orth. Eur., p. 269, tab. xiii, figs. 3, 



3«— J. 

 Platycleis griseus, Brunner, Prod, der Eur. Orth., p. 347. 



Greneral colour greyish-fuscous. Head with the frons almost covered by 

 reddish-fuscous markings, vertex with two blackish spots (sometimes obsolete). 

 Pronotum with the disc subdepresscd, median ridge showing posteriorly. Elytra 

 and wings fully developed ; elytra with several fuscous spots, wings hyaline, some- 

 what smoky at the apex, green towards the base. Posterior femora with a fuscous 



