402 CLASS ARACHNIDA. 



tory, has discovered, in the environs of Philadelphia, another 

 species {Atypus riijlpes) altogether black, with the feet fawn- 

 coloured. 



Eriodon, Lair. Missulena, Walck., 



Differ from the atypi, in their elongated and narrow tongue 

 advancing between the jaws, and their eyes scattered on the 

 front of the thorax. 



The only known species {JEriodon occatorius, Latr, ; Missu- 

 lena, Walck. Tab, des Aran. pi. ii. 11, 12), is an inch long, 

 blackish, and proper to New Holland, from which it has been 

 brought by Peron and Lesueur. 



Our second and last division of my gales, or araneides with 

 four pulmonary sacs, presents characters common to eriodon, 

 as that of having the tongue prolonged between the jaws, the 

 palpi composed of five articulations ; but the claws of the 

 forceps are bent along their internal edge ; their spinnerets are 

 six in number ; the first pair of feet, and not the fourth, is the 

 longest of all ; the third is always the shortest. Some of these 

 arachnides have but six eyes. The number of pulmonary sacs 

 will not permit us to remove the subgenera of this division 

 from the preceding ; and as it conducts us to drassus, to clotho, 

 to segestria, subgenera presenting only two pulmonary sacs, 

 the natural order will not permit us to pass from the mygales 

 to the lycosEe and other hunting or erratic araneides. The 

 mygales are genuine weaving spiders ; and, in truth, it was in 

 this division that the avicularia of Linnaeus was originally 

 placed. 



This second division comprehends the two following sub- 

 genera, 



Dysdera, Latr., 



Which have but six eyes, arranged in the form of a horse- 

 shoe, with the aperture in front ; \vhose forceps are very strong 



