298 
ARACHNIDES. 
Uloborus, Lat. 
The four posterior eyes placed at equal intervals on a straight line, 
and the two lateral ones of the first line nearer to the anterior edge 
of the thorax than the two comprised between them, so that the line 
is arcuated posteriorly. Their jaws, like those of the Epeirae, begin 
to widen a little above their base, and terminate in the form of a 
palette or spatula. The tarsi of the three last pairs of legs terminate 
by one small nail. The first joint of the two postei’ior ones has a 
range of small setae. 
The body of these animals, as well as in the following subgenus, 
is elongated and nearly cylindrical. Placed in the centime of their 
web, they advance their four anterior legs in a straight line, and 
extend the two last in an opposite direction ; those of the third pair 
project laterally. 
These Arachnides construct webs similar to those of other Orbi- 
telae, but they are looser and more horizontal. They will completely 
envelope the body of a small coleopterous insect in less than three 
minutes. Their cocoon is narrow, elongated, angular at the margin, 
and suspended vertically to a web by one of its extremities. The other 
end is bifurcated or terminated by two prolonged angles, one of 
which is shorter than the other, and obtuse; there are two acute 
angles on each side. For these interesting observations I am indebted 
to my friend M. Leon Dufour. 
Uloborus Walckenaerius , Lat*. About five lines in length; 
reddish-yellowish ; covered with a silky down forming two series 
of little fasciculi on the top of the abdomen; paler rings on the 
legs. From the woods in the vicinity of Bourdeaux, and in 
various departments of the south of France. 
Tetragnatua, Lat. 
The eyes placed four by four on two nearly parallel lines, and 
separated by almost equal intervals ; jaws long, narrow, and only 
widened at their superior extremity. The chelicerae are also very 
long, in the males especially. The web is vertical f. 
Epeira, Walck. 
The two eyes on each side approximated by pairs, and almost con- 
tiguous; the remaining four forming a quadrilateral in the middle. 
The jaws dilate from their base, and form a rounded palette. 
The cucurbitina is the only species known whose web is horizon- 
tal ; that of the others is vertical, or sometimes oblique. 
Some place themselves in its centre in a reversed position, or with 
their head downwards ; others construct a domicil close by it, either 
vaulted on all sides, or forming a silky tube composed of leaves 
drawn together by threads, or open above, and resembling a cup or 
the nest of a bird. The web of some exotic species is formed of such 
* Lat., Gen. Crust, et Insect., I, 109; see also second edition of the Nouv. 
Diet. d’Hist. Nat., article Ulobore. 
y Tetragnaiha extensa, Walck., Hist, des Aran., V, vi ; Aranea extensa, L., Fab., 
De Geer ; — Aranea virescens ? Fab , ; — Aranea rnaxillosa, Id. See Tab. des Aran, of 
Walckenaer. 
