HUNGERFORD: AQUATIC HEMIPTERA. 39 
will be done, beginning with those being the least adapted, and 
ending with those with most perfect adaptation to an aquatic 
life. 
LOCOMOTION. 
In the matter of locomotion of those forms that live upon the 
waters and shores adjacent, we find all gradations from those 
that venture but timidly upon the water to those that boldly 
set forth upon the deep. In fact, there are some that fre- 
quent the banks and are found upon the waters only by acci- 
dent. Such are the Saldidz, Ochteride and Gelastocoride. 
The first family is so called because of the jumping propen- 
sities of its members. 
As a matter of fact, the members of all three families jump. 
The first are extremely agile, running and jumping with alac- 
rity, using the wings in tremendously quick flights of a few 
inches. The last named run or go bumping along like toads. 
Unlike the well-known Saltatores among the Orthoptera, the 
hind femora are not notably enlarged. The hind coxe, how- 
ever, in some at least, are considerably thickened. The spines 
of the hind tibia, instead of being arranged on the caudal side, 
as in grasshoppers and Jassids, are arranged on the opposite 
and inner side. The middle tibia possesses a few spines, the 
hind tibia and tarsus many. When the live insect is studied 
in respect to its locomotion, the position of the limbs makes 
their armament very clear. These insects rest with femora 
of hind limbs at right angles to the body, and the front 
side of the long tibia often in contact with the ground. The 
tarsal claws are terminal and the fore and middle tibize of the 
Saldide bear on their inner distal end tibial combs. 
An examination of the members of these three families indi- 
cates a superficial resemblance, with the Ochterid bridging the 
gap between the Gelastocoride and the Saldide. 
The Hebridz observed by the writer, though occupying the 
same territory as the Saldids, are equipped more like the 
Microvelias. The body is covered with a short pile. The 
limbs, fore and middle, possess tibial combs. The claws are, 
however, terminal, and in this respect distinguish them from 
the Microvelias. 
The above shore bugs are followed by a mixed lot that extend 
their range to the floating vegetation. Here belong the Micro- 
velias, Mesovelias and Hydrometras. All of these have the 
