722 MR. F. 0. PICKARD CAMBRIDGE ON [June 16, 
The division Opisthothele is subdivided into two suborders similar 
in their extent to those of M. Simon, for which Mr. Pocock has 
selected the names Vygalomorphe and Arachnomorphe. 
So recently as March 1, 1895, Dr. Thorell (‘ Descript. Catalogue 
of the Spiders of Burma’) has selected two new names for two 
similarly constituted suborders—Parallelodontes and <Antiodontes, 
referring of course to the articulation of the mandibles. These 
two suborders are apparently equivalent to M. Simon’s “ Aranee 
Theraphose” and “Aranee Vere,” and to Mr. Pocock’s “ Mygalo- 
morphe” (excluding Liphistius) and “ Arachnomorphe.” 
Which of these names are most suitable? One might suppose 
that those which referred to some important character would be 
the most convenient ; but such is not necessarily the case, since, 
for instance, the division into Tetrapnewmones and Dipneumones 
was entirely suitable until the discovery of “ Hypochlus,” with four 
lung-books, and the fact that ‘ Nops” had no lung-books but four 
tracheal stigmata; so that, although Dr. Thorell’s terms “ Paral- 
lelodontes” and “ Antiodontes” are suitable as referring to an im- 
portant differential character of the two groups, yet these, too, 
are liable to be laid aside, when perhaps some form is discovered 
offering in itself characters proving it to belong to both suborders. 
As a matter of fact, the names which have less direct reference 
to such characters are in reality after all more convenient, and 
indeed suitable, and certainly a single name is more convenient 
than a double one—* Mygalomorphe” than “Araneee Theraphose,” 
for instance. 
For these reasons. I have retained the terms ‘‘ Mygalomorphe” 
and ‘* Arachnomorphe” in the present paper; while I can see no 
reason for substituting the new family name Aviculariide of 
M. Simon for the older and quite as suitable name Theraphoside 
of Thorell, following Walckenaer. 
Family THERAPHOSID 4, Thorell. 
List of Genera, Species, and Subspecies from the Lower Amazons 
from January to March, 1896—including twelve genera, 
fourteen species, and one subspecies: of these, four genera 
are new, eleven are new species, one a new subspecies, and 
one the male sex of which is new to science. 
Subfam. ParaTropiDin&. 
Genus Paratropis, E. Sim. Species P. papilligera, n. sp., 3 2, p. 728. 
,, <Anisaspoides, new. » A. gigantea, n. sp., 9, p. 726. 
ACTINOPODINA. 
Genus Actinopus, Perty. Species A. wadlacet, n. sp., 2, p- 728. 
»  OTENIZINE. 
Genus Acanthodon, Guérin. Species A. santaremia, u.sp., 2, p. 733. . 
A BaryYcHELinz. 
Genus Homeoplacis, E. Sim. Species H. austeni, n. sp., d, p. 735. 
AVICULARIINE. 
Genus Acanthoscurria, Auss. Species A. geniculata, C.K., 2, p. 787. 
A, brocklehursti, n. sp., 9, 
[p. 739. 
” ” ” ” 
