290 
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, 
interiorly, 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 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 — Atypus rufipes — 
near Philadelphia, which is entirely black, with fulvous feet. 
Eriodon, Laf.— MissuiiENA, 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 occa^o?■^'a,Walck., Tabl. des Aran. pi. II, ii, 12 — is an inch 
long, blackish, and peculiar to New Holland, where it was dis- 
covered by MM Peron and Lesueur *. 
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 cheliceree are folded over their inner face, 
there are six fusi, their first joair 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 notallow 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 wall not permit us to pass from 
the Mygales to the Lycosae and other hunting or wandering 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 Linnaeus was formerly placed. 
This second division comprises the two following subgenera. 
♦ 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 ne-w genus (Chaliuura). The eyes are placed on a very high 
anterior tubercle, four of them, of which the tw’o 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 genus. 
