PULMONARI^. ■ 183 



thorax, invested with a purple silky down; the abdomen is a 

 mixture of blue, red, and green, with metallic reflections, and 

 marked by two transverse and golden lines, of which the ante- 

 rior is arcuated. Four golden dots are sometimes observed on 

 it(l). 

 In the other Tubitelas the jaws do not surround the ligula; their 



external side is dilated inferiorly beneath the origin of the palpi. 

 Some have but six eyes, four of which are anterior, and form a 



transverse line, and the two others posterior, situated, one on each 



side, behind the two lateral ones of the preceding line. Such is 



the essential character of the 



Segestria, Lat. 



The ligula is elongated and almost square. The first pair of legs, 

 and then the second, is the longest; the third is the shortest. These 

 spiders construct long, silky, cylindrical tubes in the chinks and 

 crevices of old walls, which they inhabit; their first pairs of legs are 

 always directed forwards,, and diverging threads border the external 

 entrance of their domicil, forming a net for ensnaring Insects. The 

 genital organ of the S. perjida — Aranea florentina, Ross., Faun. 

 Etrusc, XIX, 3— a large black species with green chelicerse, which, 

 is not rare in France, is shaped like a tear, or is ovoido-conical, 

 very acute at the end, entirely salient, and red(2). 



The remaining Tubitelae have eight eyes. On account of the dif- 

 ference in the site of their habitations, we may divide them into the 

 terrestrial and the aquatic. Although the last family of the Ara- 

 neides of Walckenaer (his Naiades) is composed of these latter, 

 they are so closely allied to the other Tubitelse, that notwithstanding 

 this disparity of habits they must be placed together. In those 

 which are terrestrial, the ligula is almost sq'uare, or but very 

 slightly narrowed, with a very obtuse or truncated summit; the 

 jaws are straight, or nearly so, and more or less dilated towards 

 the extremity; the two eyes of each lateral extremity of the ocular 

 group are generally separated from each other, or at least are 

 geminate and placed on a particular eminence like those of the 

 aquatic Tubitelae. 



Clubiona, Lat. 

 This subgenus is only distinguished from the following one by 



(1) For the other species, see Faun. Paris., Walck., andTabl. dcs Aran., Id. 



(2) Add the Seg, aenocuhta, "W^alck., Hist, des Aran., V, vii; Jlranca senocuhiia, 

 : Desr 



