HEMIPTERA. 167 
Prorarta, Scop.—Emesa. Fab. 
Analogous to the preceding Insects in the linear form of the body, 
and the length and tenuity of the legs; but the two anterior ones 
have elongated coxee, and are adapted, as in Mantis, for seizing their 
prey *. 
We now come to Geocorise, remarkable for their large eyes, and 
which have no apparent neck, but whose transversal head is sepa- 
rated from the thorax by a strangulation. 
They live cn the shores of ponds, &c. where they run with great 
swiftness, and frequently make little leaps. 
Some have a short and arcuated rostrum, and setaceous antenne. 
They form the 
Lerropus, Lat. t. 
In the others the rostrum is long and straight, the labrum projects 
from its sheath, and the antenne are filiform or a little larger near 
the extremity. The simple eyes are situated ona tubercle. They 
are considered by Fabricius as Saldze. 
Latreille separates them into two divisions. His Acanrai£z—or 
part of the Sapa, Fab. t}—have salient antenne, at least equal in 
length to half that of the body. Their form is oval. The simple 
eyes are closely approximated and sessile. In his PELoGonus§ the 
antennee are much shorter and bent under the eyes. The body is 
shorter and more rounded, and there is a tolerably large scutellum. 
The simple eyes are remote. These Hemiptera approach the Nau- 
cores, and with the following appear to lead to them. 
Sometimes the four posterior legs, very slender and extremely 
long, are inserted on the sides of the pectus, and are very remote 
from each other at base; the tarsial hooks are very small, but little 
distinct, and situated in a fissure of the lateral extremity of the tar- 
sus ||. These legs are adapted for swimming or walking on water, 
and are peculiar to the genus 
Hyprometra, Fab. ¥, 
Which Latreille divides into three subgenera : 
Hyprometra, Lat., 
Or Hydrometra properly so called, where the antenne are setace- 
cus, and the head is prolonged into a long snout, receiving the rostrum 
in a groove underneath **, 
* Fab., Syst. Ryng.; Gerris ragabundus, Ejusd.; Lat., Ib. 
+ Lat., Consid. sur Ord. Nat. des Crust. et des Insect., p. 259. 
+ Fab., Ib. The Salde zostere, striata, littoralis: Lat., Ib. 
§ Lat., Consid. sur l’Ord. Nat. des Crust et des Insect., III, p. 142 ; Germ. 
Faun. Insect. Europ., XI, 23. 
|| The prothorax is extended above the mesothorax, in the form of an elongated 
plate, narrowed and terminated in a point, representing the scutellum, under which 
the elytra originate. The mesothorax is greatly elongated. 
q Fab., Syst. Ryngot. 
** Lat., Gener, Crust. et Insect. III, p. 131. 
