384 
Mr. Norman 
H. Joy on the 
It also wriggles its body, which no doubt helps it along 
to some extent. S. 'providus swims much like the last. 
*8. juno, S. tarsrd.is, and 8. lustrator swim well, but 8. 
declarahis, 8. fiamptcs and 8. huphthcdmus were more sluggish 
in their actions. Chilopora longitarsis swims very readily, 
using its back legs strongly. 
These are, of course, all more or less waterside species, 
and one would expect them to be good swimmers. Some 
waterside species, however, are almost helpless when on 
the surface of the water, and this is specially the case 
with the 8ta'phylinidac. Quedius manrorufm hardly pro¬ 
gresses at all by ineffectual wriggling of its body, yet it 
is commonly found in company with D. coerulescens in 
moss at the sides of waterfalls. Evaesthetus is quite help¬ 
less, but all very small species are much affected by 
capillary attraction, being drawn to small pieces of stick, 
etc., and are quite unable to get a start off. Dyschirins 
globosus has great difficulty in overcoming this attraction, 
and then only swims feebly, using all the legs alike as 
in walking. Tachypori move their legs, which are well 
spread out, rapidly, but make quite slow progress. 
Trogophloei and Homcdotae also swim, but are much 
affected by capillary attraction. Oxypoda vittata only in¬ 
effectually wriggles its body. 
Quedius vexans, which often gets washed out of moles’ 
nests in low-lying districts and is not uncommonly found 
in flood rubbish, struggles violently with a great deal of 
the body, and gets along at a fair rate, chiefly by using 
the forelegs very rapidly ; the middle legs are not moved 
so fast, and the back legs only occasionally. The front 
legs are moved in a vertical plane, as is the case with a 
dog, only they are never lifted out of the water. Q. 
fvliginosus, Hctcrothops nigra and 8tilicus ajfinis behave 
like Q. vexans. 
Besides swimming there is yet another method of pro¬ 
gress, viz.— walking on the water. 8tenus juno on several 
occasions deliberately cleared itself of the water, and 
walked with its tarsi on the surface of that element. 
It first raised the front part of its body on the anterior 
and middle tarsi; the abdomen being afterwards cleared 
with the help of the back legs. 8. opticus very easily cleared 
itself of the water and walked on the surface with the 
abdomen high in the air. Occasionally it allowed the 
abdomen to touch the water, but then always stopped for 
