S90 ARACHNIDES. 



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 bidendated 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 tlien inclined, it 

 weaves a tube of Avhite 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 — Atypiis rufpes — 

 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. ; Missu- 

 lena occatoria,Wa[ck., Tabl. des Aran. pi. II, ii, 12 — is an inch 

 long, blackish, and peculiar to Ncav Holland, where it was dis- 

 covered by M M Peron and Lesueur *. 



In our second and last division of the quadri pulmonary 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 

 butsix 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 to Drassus, Clotho, and Segestria, subgenera with but 

 two pulmonary sacs, the natural order will not permit us to pass from 

 the Mygales to the Lycosae and other hunting or Avandcring Spiders. 

 The Mygales are true tapissieres — 'Or true spiders which line their 

 galleries with silk — and in fact, it was in this division that the Ara- 

 nea avicularia of Linnteus was formerly placed. 



This second division comprises the two following subgenera. 



* In the first memoir of M. Dalman upon the Insects foiind 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 approx- 

 imated, occupying the centre. The external fusi are much elongated. From these 

 characters it would seem that this spider approaches Mygale or some other analo- 

 gous geaus. 



