20 MAXDIBULATA. ORTllOPTERA. 



of the thorax, as well as the magnitude of the elytra, the greater 

 disproportion in the size of the hinder femora, as also their more 

 remote antennse, sessile eyes, &c. divide them from Acrydium. The 

 indigenous species appear to be either very numerous or subject to 

 great variations ; they are very difficult to understand, but the fol- 

 lowing seem distinct, and to facilitate their examination I have sub- 

 divided the genus into sections, as proposed by Zettersted. 



A. Thorax with a single elevated line. 



Sp. 1. migi-atoria. Thorace antice suhabrupte compresso-angustiori, elytrisjlavo 



J'uscoque nebuhsis, mandibulis cceruleis. (Long. corp. 1 unc. 6 — 10 lin.) 

 Gryllus migratorius. Linne. — Donovan, v. viii. pi. 270. — Lo. migratoria. 



Steph. Catal. 301. No. 3315. 

 Head glossy, greenish-yellow, punctured, with four raised lines in front 

 between the eyes; the two intermediate ones dusky; mandibles pale blue, 

 with blackish tips ; thorax rather abruptly compressed, and narrowed 

 anteriorly, the lateral lobes deflexed, subquadrate, with the angles rounded, 

 the hinder margin produced somewhat angularly in the middle ; the back 

 with a sharp ridge, the whole of a livid greenish hue, with a brownish 

 longitudinal line on each side ; elytra clouded with pale yellowish and 

 fuscous ; legs pale ; posterior femora green or bluish beneath, with some 

 obscure brownish clouds without, and a spot within and a belt over the apex 

 bluish; tibise reddish, or pale. 



Although this insect, " the Migratory Locust," has been taken 

 in several parts of the country, as the vicinity of Nottingham, 

 Packington in Warwickshire, St. James's Park, the neighbourhood 

 of Yarmovith, the coasts of Essex, Kent, and Suffolk, &c., it can 

 scarcely be called indigenous, excepting inasmuch as the individuals 

 arrive in a state of nature in this country, and are not imported ; 

 but I believe they do not breed here. 



Sp. 2. stridula. Nigricans, clytris nebuhsis, alis in utroque sexu rub7'is, 

 apice nigris. (Long. corp. 10 — 12 lin.) 



Gr. stridulus. Linne. — Stewart (!) — Steph. Catal. 301. No. 3318 note. 



Dusky, obscure, head deeply punctured, with the sides rugged ; thorax 

 unequal and rugose, with a central ridge and a rather distinct fovea on each 

 side in the middle of the base ; elytra either black, clouded with brown, or 

 brown spotted with black, or dusted with brownish ; wings red, with the 

 apex broadly black ; legs obscure ; posterior tibise with a pale or whitish 

 belt at the base. 



Stewart gives this as British, but as I have never seen an indigenous specimen, 

 I suspect be is mistaken. 



