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HETEROPTERA. — ACANTHIID. 465 
The fourth family, AcANTHIID®, consists also of but few species, 
of small size, but interesting structure, distinguished by their large 
eyes, oval depressed bodies, long and simple legs, and long and slender 
rostrum, the second joint of which is greatly elongated and straight. 
This character exists in three genera, which, in several other im- 
portant respects, differ from each other, namely, Acanthia Latr. 

(Salda Fabr.) ( fig. 120. 10. A. saltatoria), Pelogonus Latr. (fig. 120. 
8. Pelogonus marginatus), and Aphelocheirus Westw. (vol. i. frontisp. 
fig.7.). In the first of these genera, for which I retain the name of 
Acanthia (which the Germans give to the bed-bug, which ought 
surely, however, to retain the generic name of Cimex), the antenna 
are nearly half the length of the body, the terminal joints not thinner 
than the preceding (fig. 120. 10.) ; the legs are formed for running ; 
the ocelli are present between the eyes; and the rostrum is elon- 
gated ( fig. 120. 11.). These are minute insects, found on the borders 
of rivers and other water, as well as the sea-shore; and possessing 
great activity, both in running and flying: they also leap tolerably 
well. The tarsi are 3-jointed, the basal joint being concealed on the 
upper side ; the ungues are long, and without pulvilli. I possess the 
pupa of A. saltatoria, which differs from the imago in the want of 
ocelli, in having the rudiments of the fore wings half the length of 
the abdomen; those of the hind wings are only slightly visible be- 
tween the other two. 
The genus Pelogonus (fig. 120. 8.) is another of the links imme- 
diately connecting the two sections of the order, agreeing with the 
Galgulide in general characters, except in having the fore feet 
simple ; whilst it agrees with Acanthia in the peculiar structure of 
its rostrum (fig. 120. 9.), but differs in the shortness of its antenne. 
VOL, II, H 
