CLASS III. ARACjrSOIDA. 
125 
by communicating with the threads of the large net, both gives her 
intelligence when any thing touches the web, and enables her to pass 
quickly in order to seize it. 
Genus 12. AGELENA. Walckcnuer, Leach 
Maxilla straight and longitudinal, their interna angle slightly trun- 
cate ; diameters equal, apex rounded : lip not longer than broad, to- 
wards the superior angle a little narrower : tegs moderately long, the 
anterior and fourth [.airs of nearly equal length, the third pair 
shortest: eyes disposed in two transverse lines near to each other, 
and bent backwards. . 
Sp. l. As. labyrinthica. Griseous pale-reddish : thorax on each side 
with a blackish longitudinal line : abdomen black, above and on 
each side with white oblique lines forming obtuse angles, running 
together anteriorly in pairs; the weaving appendices or nipples 
inhabits the fields. It is very common in most parts of Europe during 
the summer months. In Britain it is most abundant in the au- 
tumn. It spins a horizontal web on the ground, in which it watches 
for its prey, consisting of flies and other dipterous insects 1 he 
spider itself lives in a funnel-shaped cavity, olten extending below 
the surface of the ground. 
Genus 13. ABGYRONETA. Latreille, Wakkemer, Leach 
Maxilla short, straight, elongate quadrate, the sides of nearly equa 
diameters ; anteriorly convex ; the apex rounded : Up short, shorter 
than the maxilla;; of a narrow elongate-triangular form ; the ante- 
rior aspect, convex; the apex obtuse or truncate : legs, the first, the 
fourth pair longest; the second pair shortest: eyes with the four 
middle ones forming a quadrangle, the two oil each side set obliquely 
and subgeminated. 
%». 1 . Arg. uguutica. Blackish-brown : abdomen black velvety, with 
some impressed dots on its back. , 
Aranea aquatica. Linn., Fabr. Argyroneta aquatica. Latr^ W alclc., 
Leach. . 
Inhabits Europe, frequenting slow running waters and ditches, spin- 
ning a web most beautifully constructed under the water, in which 
« lives, being surrounded with air, which shines through the water 
with a silvery lustre. The eggs are deposited in a globose silky 
bag. It i s extremely common in most of the ditches round Lon- 
don, and may be observed, especially in the beginning ot the sum- 
mer, building its nest beneath the water, or running along the lines 
by which it is suspended. 
S fiRPS 2 —Legs simple : hinder ryes not placed on the anterior and 
superior of the thorax, nor forming an irregular hexagon: nipples 
