294 ARACHNIDES. 



and resembling a tent, like that of the Clotho, beneath which 

 was the cocoon. It is, I presume, the work of this species of 

 Drassus, and proves the analogy of this subgenus with the pre- 

 ceding one. M. Leon Dufour, Ann. des Sc. Phys., VI, xcv, 

 1, has given a very complete discription of a species of Drassus 

 — D. segestriformis — found by him under stones in the highest 

 Pyrennees, and never beneath the Alpine region. It is one of 

 the largest of this subgenus, and appears to me to be closely 

 allied to my melanogaster, which I believe to be the D. lucifugus 

 Walckenaer, Schaeff. I con. CI, 7- 



One of the prettiest species, which is very commonly observed 

 running along the ground in the vicinity of Paris, is the D. 

 relucens. It is small, and almost cylindrical, with a fulvous 

 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 *. 



In the other Tubitelae the jaws do not surrovmd 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 



Segestru, 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 Avails, 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 oi'gan of the S. perfida — Aranea fiorentina, Ross., Faun. 

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

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

 acute at the end, entirely salient, and red f. 



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 Araneides 

 of Walckenaer (his Naiades) is composed of these latter, they are so 

 closely allied to the other Tubitelae, that notwithstanding this disparity 

 of habits they must be placed together. In those which are terres- 

 trial, the ligula is almost square, 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 Tidsitelse. 



* For the other species see Faun. Paris., Walck., and Tabl. des Aran., Id. 

 t Add the Seg. senoculata, Walck., Hist, des Aran., V, vii ; Aranea senoculala , 

 L.; Deg. 



