178 ARACHN1DES. 



different from that of the same part in the Mygales. The che- 

 licerae are very stout, and underneath the claw and at its base is 

 a little eminence resembling a tooth. The last joint of the palpi 

 of the male is pointed at the end. From the genital organ 

 arises, inferiorly, a little squamous semi-diaphanous piece, 

 widened and unequally bidentated at the end, with a small seta 

 or cirrus at one of its extremities. This species excavates a 

 cylindrical gallery in sloping grounds covered with grass; in 

 this gallery, seven or eight inches in length, horizontal at first 

 and then inclined, it weaves a tube of white silk of the same 

 form and dimensions. The cocoon is fastened with silk by both 

 ends to the bottom of the gallery. It is found in the environs 

 of Paris and Bourdeaux; M. Basoches has observed a variety 

 near Seez, which is always of a light brown. 



M. Milbert has discovered another species Mypus rufipes 

 near Philadelphia, which is entirely black, with fulvous feet. 



Eriodon, Lat. Missulena, Walck. 



The Eriodons differ from the Atypi in their elongated, narrow 

 ligula advancing between their jaws, and in their eyes, which are 

 scattered over the anterior part of the thorax. 



The only species known Eriodon occatorius, Lat.; Missulena 

 occatoria, Walck., Tabl. des Aran. pi. II, ii, 12 is an inch long, 

 blackish, and peculiar to New Holland, where it was discovered 

 by MM. Peron and Lesueur(l). 

 In our second and last division of the quadripulmonary Spiders 

 or Mygales, we find characters common to Eriodon, such as the 

 ligula being prolonged between the jaws, and the palpi consisting 

 of five joints; but the claws of the chelicerae are folded over their 

 inner face, there are six fusi, their first pair of legs is the longest 

 and not the fourth, and the third is always the shortest. Some of 

 them have but six eyes. The number of pulmonary sacs will not 

 allow us to remove the subgenera of this division from the preceding 

 ones, and as they conduct us toDrassus, Clotho, and Segestria, sub- 

 genera with but two pulmonary sacs, the natural order will not per- 



(1) In the first memoir of M. Dalman upon the Insects found in amber, that 

 celebrated naturalist mentions (p. 25) a Spider which, it appeared to him, should be 

 made the type of a new genus (Chalinura). The eyes are placed on a very high 

 anterior tubercle, four of them, of which the two anterior are very large and ap- 

 proximated, occupying the centre. The external fusi are much elongated. 

 From these characters it would seem that this spider approaches Mygale or some 

 other analogous genus. 



