452 CLASS VIIT. 



I. Posterior feet longer than body. 



Tetrix LATE., Acrydium FABR. Antennae short, with thirteen 

 to fifteen joints. Prothorax receiving a part of the head and 

 covering the oral organs. Pronotum produced into a scutellum 

 above the abdomen, sometimes beyond the abdomen. Plantula 

 between the claws of tarsi none. 



Sp. Tetrix bipunctata, Acrydium bipunctatum, FABR., Gryllus bipunctatus'L., 

 DE GEER, in. PI. 23, fig. 15 (magnified), DUMERIL, Cons. gen. s. I. Inn. 

 PL 25, fig. 5, &c. ZETTERSTEDT adopts different' species here, which appear 

 to be only varieties. Comp. on this species (whose scutellum is not longer 

 than the abdomen) and Tetrix subulata (whose scutellum extends with its 

 apex behind the abdomen) PHILIPPI Orthoptera Berolinemia (Berolini, 

 1830, 4to), pp. 41, 42. 



Add genus Amorphopus SERV., imperfectly known, and Hymanotes 

 WESTW., Choriphyllum SERVILLE, with dorsum compressed into a 

 foliaceous crest erect above the body; habit of Membracis, SERVILLE, 

 1. 1. PL 8, fig. 5. 



Gryllus FABR., Acridium LATH. Antennge of length of head 

 and thorax, with about twenty (twenty to twenty-four) joints. 

 Anterior extremity of prosternum not covering mouth. Plantula, 

 or pulvillus between the claws of tarsi. 



Note. LATREILLE conjoined in sub-genus Podisma, species of which the 

 elytra and wings are short and unfit for flight. As FABRICIUS had previously 

 written the genus Acrydium incorrectly, so also LATREILLE called it Acry- 

 dium, whom many imitated. It is, however, 'AKpidiov ; and I would wil- 

 lingly have rejected the diminutive form, and have given the name Acris 

 to the genus, since large, and even the largest species are contained in it. 

 It appeared, however, more advisable to give the name of Gryllus to this 

 the largest portion of the old Linnsean genus of the same name. 



Gryllus FABR. Antennae filiform or clavate. [Here belong 

 genera Ommexecha SERV. (not BRULLE), Gomphocerus THUNR, 

 (Edipoda LATR., Oxya SERVILLE, Monachidium ejusd. and some 

 others; on which comp. BURMEISTER, Handb. n. 2, 1838, pp. 602, 

 &c., and SERVILLE, Hist. n. des Ort/iopt.] 



Sp. Gryllus migratorius L., RCESEL, Ins. n. Locust, xxiv. ; BLUMENBACH, 

 Abbild. naturJc. Gegenst. No. 29 ; the thorax obtusely carinated, the jaws 

 bluish black. This insect is found in different regions of Europe and Asia, 

 and appears sometimes in great swarms, destroying everything on its road. 

 See on the devastations caused by this and other grasshoppers, KiRBY and 

 SPENCE, Introd. to Entomol. I. pp. 215 226; EITPER'S ErdTcunde also 

 contains many relations on that matter fx-om different parts of Asia. In 



