ARACHNOIDEA. 591 
Segestria LATR. Ocelli arranged in two rows; the anterior row 
of four, the posterior of two remote. Feet as in the preceding 
genus. 
Sp. Segestria senoculata WALCKEN., Aranea senoculata L., DE GEER Mém. 
vu. Pl. 15, fig. 5, WALCKEN. Aranéid. Tab. I. Pl. 7, &c. 
Scytodes Latr. Ocelli six, equal, disposed in pairs, forming a 
triangle with the vertex forwards. 
Sp. Scytodes thoracica LATR. Gener. Crust. et Ins. Tab. v. fig. 4, WALCKEN. 
Aranéid. 1. Pl. ro. 
Add genera Ariadne Sav. and Uptiotes W Ack. 
+t+t Ocelli eight. 
Clotho WALCKEN. 
Dyassus WALCKEN. 
Asegena SUNDEV. 
Clubiona Latr. Ocelli arranged in two lines transverse, 
approximate. Maxille straight, subdilated outwards at the base, 
rounded at the apex. Labium elongato-subquadrate, truncated or 
emarginate at the apex. 
Sp. Clubiona holosericea Latr., Aranea holosericea L., DE GEER Mém. vit. 
Pl. 15, figs. 13—16, Wack. Aranéid. tv. Pl. 3; mouse-grey, satiny- 
shining, with an elongate pointed abdomen. The female lays her eggs 
between one or two leaves spun together. 
Anyphena SuNDEV. 
Ciniflo Buackw. 
Argyroneta LAtrr. Ocelli eight, four middle forming a square 
(.°::°.). Maxille straight, rounded at the apex. Labium elon- 
gato-trigonal. 
Sp. Argyroneta aquatica LatR., Aranea aquatica L., CLEROK Aran. Pl. 6, 
Tab. 8, Dz Grrr Mém. vu. Pl. 19, figs. s—13, Haun Arachn. Tab. 49, 
fig. 118, HerricH-ScH#zFFER D. Ins. Heft 134, Tab. 21, 22; 6”’ long; one 
of our largest native species; thorax red-brown, abdomen blackish, the 
first pair of legs longer the rest. This spider lives in fresh water; as it 
swims the abdomen and the thorax have a silvery aspect from the attached 
stratum of air. This species spins a bell-shaped, water-proof web that is 
filled with air, and open below; this it attaches to water-plants by threads. 
See the observations of DE GEER loc. cit. p. 303—313, those of Dz Licnac, 
&e. (of which WALCKENAER gives an ample extract in his Hist. nat. des 
