18 INSECTA. 
In other Acrydia, also winged and with filiform antenne, the su- 
perior portion of the thorax is very elevated, strongly compressed, 
and forms an acute crest rounded and prolonged posteriorly. Certain 
species foreign to Europe are very large. The south of Europe pro- 
duces one that is smaller, the Acrydium armatum, Fisch., Entomog. 
Imp. Russ., I, Orthop., I, 1. 
In the others, G. pedester—Giornx, Charpent.—one at least of the 
two sexes has elytra and very short wings, not at all adapted for 
flight. They form my new genus PopisMa. 
Those Acrydia in which the extremity of the antennz is inflated 
in the form of a button, either in one sex or both, constitute the 
genus Gompnocerus, Thunb. Such is the 
A. sibiricus; G. sibiricus, Fab.; Panz. Faun. Insect. Germ., 
XXIII, 20. Anterior tibize of the males strongly inflated and 
clavate. Found in Siberia and St Gothard. 
In the second division of the genus of the Acrydia the presternum 
receives a portion of the under part of the head into a cavity; the 
ligula is quadrifid; the tarsi have no pellet between their hooks. 
The antenne are composed of but thirteen or fourteen joints. 
The thorax is prolonged posteriorly in the form of a large scutel- 
lum, sometimes longer than the body, and the elytra are very small. 
‘These Orthoptera form the genus 
Terrix, Lat.—Jdcerydium(1), Fab.—partim Gryllus-bulla, Lin. — 
It consists of very small species. 
Ib., 8;—G. lineatus, Ib., 9; and see De Geer, —Santerelles de passage, pl. i—xiil, with 
the exception of the figures quoted under Z'’ruxalis;—Olivier—article Criquet of 
the Encyc. Méthod.; and the other authors quoted by Fabricius, under his genus 
Gryllus, such as Scheffer, Herbst., Drury, Res., &c. See also Lat., Gen. Crust. 
et Insect., III, p. 104. These references, however, are only applicable to the 
genus Acrydium as originally established, or with the subtraction of those here 
indicated, and which may be considered simple divisions. 
(1) Acrydium subulatum, Fab.; De Geer; Scheff., Icon. Insect., cliy,, 9, 10, 
clxi, 2, 3;—4. bipunctatum, Panz., Ib. V, 18, var.;—A4. scutellatum, De Geer, M. 
Insect., III, xxiii, 15. Seealso Herbst., Archiy. Insect., lii, 1—5. 
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