452 CLASS VIII. 
I. Posterior feet longer than body. 
Tetrix LAtTR., Acrydium Fanr. Antenne 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 Fasr., Gryllus bipunctatus L., 
De Geer, 11. Pl. 23, fig. 15 (magnified), Dumarit, Cons. gén. s. l. Ins. 
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) Puiuippi Orthoptera Berolinensia (Berolini, 
1830, 4to), pp. 41, 42. 
Add genus Amorphopus Srrv., imperfectly known, and Hymanotes 
Westw., Choriphyllum SERvVILLE, with dorsum compressed into a 
foliaceous crest erect above the body; habit of Membracis, SERVILLE, 
ee P18; ee 8. 
Gryllus Fasr., Acridium Latr. Antenne 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 Faprictus had previously 
written the genus Acrydiwm incorrectly, so also LATREILLE called it Acry- 
diwn, whom many imitated. It is, however, ’Axpldioy ; 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 Linnzan genus of the same name. 
Gryllus Fasr. Antenne filiform or clavate. [Here belong 
genera Ommexecha Serv. (not Bruiit), Gomphocerus THuns., 
Gdipoda Latr., Oxya SERvILLE, Monachidiwm ejusd. and some 
others; on which comp. Burmester, Handb. 11. 2, 1838, pp. 602, 
&e., and Servitue, Hist. n. des Orthopt. | 
Sp. Gryllus migratorius L., Rasen, Ins. u. Locust. XXIv.; BLUMENBACH, 
Abbild. naturk. 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. 1. pp. 215—226; Ritrer’s Erdkunde also 
contains many relations on that matter from different parts of Asia. In 
