62 [ March, 



v.— LOCUSTA, de Geer. 

 In the sub-family Locustidce, to which this genus belongs, the 

 species have the foramina of the anterior tibiae cleft-shaped, as in the 

 preceding sub-family Conoceplialidce, and in the succeeding one Decti- 

 cidcB ; and from the former of these it is distinguished by the anterior 

 tibife having a well-marked longitudinal lateral furrow, and an apical 

 spine above in the external margin ; while from the latter the spined 

 prosternum will serve to separate it. The presence of two spines o\\ 

 the prosternum does not hold good as a character to distinguish the 

 Locustidce from the Deciicidce when all the European genera arc 

 regarded, about half the genera of the latter sub-family haviug tlir 

 same structui'e, but the single British genus Decticus belongs to that 

 group of the sub-family in which the species have an unarmed prd- 

 sternum, and as the character is easy to recognise, it has been us( 

 for the British forms. In all the Decficidce the first joint of the pos- 

 terior tibiae has two long free processes underneath (the "plantules";, 

 which are wanting in the Locustidce. 



1. LoCUSTA TIEIDISSIMA, LiuUe. 



Grylhts {Tcttigonici) viridissimus, Linne, Syst. Nat. (ed. x), i, p. 43(', 

 (ed. xii), i, p. 698. 



Phasgonura viridissima, Stephens, Mandib., vi, p. ICi. 



Locusta viridissima, Fabr,, Ent. Syst., ii, p. 41 ; Eischer, Orth. Europ., 

 p. 251, tab. xiv, figs. 5, 5a— y"; Brunner, Prod, der Eur. Orth., 

 p. 307. 



Of a general briglit green colour, often with fuscous or reddish-brown markings 

 above. Head with the edge of the vertex obtuse, not broader than the first joint 

 of the antennsE, with a shallow longitudinal sulcus above, and 6e)iarated from the 

 frons by a cross furrow. Pronotuni sniooth, usually with a fuscous longitudinal 

 streak occupying the middle of the disc, rounded posteriorly ; generally with a faint 

 obsolete median line not raised and best marked behind ; side flaps inserted roundly 

 (no lateral cariuiE), about as deep as they are broad at the base, inferior margin with 

 the posterior angle bluntly angled. Elytra perfectly developed, green, anal area 

 somewhat fuscous, mediastinal vein well makred, radial veins separate from the base, 

 veins brownish towards the base. Wings hyaline. Prosternum with two long spines, 

 meso- and metasternal lobes produced, acuminate. Anterior and middle femora 

 below on the anterior border with short black spines, posterior femora with black 

 spines below on both borders ; anterior tibiae on both sides with a closed tymijanuni, 

 below which is a longitudinal furrow, above with three spines in the external margin ; 

 posterior tibite above with an apical spine on either side, below with four apical 

 spines. Anal segment in g deeply silicate, produced posteriorly into two lobes, 

 hiding the supra-anal ]ilate. Cerci ( <? ) long, reaching beyond the styles, with an 

 internal basal tooth ; subgenital laniiiia {$) with long styles. Ovipositor sword- 



