On new Genera and Species of Trapdoor Spiders. 187 
XXVIII.—Description of new Genera and Species of Trap- 
door Spiders belonging to the Group 'Trionychi. By R. I. 
Pocock, of the British Museum. 
[Plate V.] 
THE subfamily Migine of Simon, all the species of which, so 
far as is known, make their trapdoor-nests upon the trunks 
of trees, embraces three genera—Moggridgea, Migas, and 
Myrtale. In the present paper I have ventured to add three 
fresh ones to the group, all of them, like Myrtale, coming 
from Madagascar. One of these, namely Thyropaus, is so 
well marked that no one can doubt of its validity; but with 
regard to the stability of the others I myself have some mis- 
givings. In the first place, since they differ from each other 
principally in the relative size of the eyes of the front row, 
species intermediate between the two will very likely turn up ; 
and, in the second place, if the figure of the carapace of 
Myrtale that M. Simon has published is inaccurate in nearly 
all its details, as I suspect but have no right to assume, then 
there can be little doubt that Paramigas will prove to be 
synonymous with Myrtale—perhaps even the two type species 
will prove identical. 
Ot the South-African genus Moggridgea tour species have 
been described—M. Dyert, Cambr., M. Abrahami, Cambr., 
M. Tidmarshi, Lenz, and M. Meyert, Karsch. But M. Simon 
states that M. Abrahami must be transferred to the New- 
Zealand genus Migas. In this I cannot agree with him, since 
specimens of M. Abrahami from Grahamstown, sent by the 
Rev. N. Abraham to the British Museum in 1887, belong 
merely to a well-marked species of Moggridgea. Moreover, 
the assertion that the nest of this species is furnished with a 
back as well as with a front door, is not strictly in accordance 
with facts, seeing that six specimens of the nest sent with 
the above-mentioned spiders are of the usual one-doored type. 
Mr. Cambridge, indeed, mentions that only one of the two 
specimens examined by him was provided with a posterior 
door ; so that we must consider it to be the exception rather 
than the rule in this species, as also in M, Dyer?, for there to 
be a second trapdoor. 
There can, 1 think, be no grave reasons for doubting that 
the species under discussion was also described by Lenz as 
M. Tidmarshi; in which case the name employed by 
Mr. Cambridge has about six months’ priority, and the syno- 
nymy may be set forth as follows :— 
