ARACHNIDA — SOLIFUG^. 
265 
V^ideo ; and a new genus, Teratodes, with long strong legs, very long 
palpi (c^), and a small hut elevated prominence for the eyes, on the top 
and at the sides of which they are situated ; with one new species, T. 
depressus, from Brazil. 
Dysderid^. — Hentz (Sillim. Amer. Journ. xli. p. 116) has charac- 
terized a new genus, Spermophora ; it has the eyes in two little clusters, 
so that three equally large stand on each side, close tp each other ; the 
legs are moderately long, thin, the first pair the longest, then the fourth 
and second ahnost of equal length ; the mandibles short, spherical, with 
very small claws ; it resembles Pholcus in the parts of the mouth, but 
has shorter legs, and only six eyes. Sp. meridionalis, found in 
Alabama, in dark places under rubbish ; it makes a very loose web. The 
female makes no web ; she carries about, in her mandibles, her eggs, 
glued to each other, until the young come out. 
The genus Argyroneta, according to the excellent researches of 
Grube, approximates to the Dysderidce, and will, perhaps, require to be 
characterized as a peculiar family ; besides the pleura, it has tracheae, 
which arise, pencil-shaped, Irom short stems opening behind the pleura, 
and have this peculiarity, that they do not ramify (J. Muller’s Archiv. 
1842, p. 300). In a very interesting treatise on the habits of the 
Argyroneta aquatica (Preuss. Prov. Blatter, 1842), the same author 
adds the important fact, that in these spiders, the distribution of vessels 
is confined to the abdomen, and is not to be found in the anterior part 
as in other spiders, so that the tracheas in it occupy their place ; pro- 
bably the air which surrounds the spider, when it dives under water, 
comes out of the tracheae. This air keeps otf the water by a peculiar 
coating of varnish, and it disappears, according to the author’s experi- 
ments, when scratched under water with a needle, and is not seen when 
the insect dives, if the varnish has been previously removed by the 
application of ether. 
SOLIFUG^. 
Phrynid^. — Van der Hoeven (Tidsschr. v. Natuurl. Geschied. en 
Physiol, ix. p. 68, t. 1) has made a careful examination of the genus 
PhrynuSy partly having for his object the external and internal ana- 
tomy of the Phrynus medius. The following remarks are made on its 
internal structure : — The intestinal canal is straight, without lateral 
branches going to the liver or the pancreas [(?) Fettkorper], as in the 
scorpions. Of the sexual parts the author could give no account. The 
nervous system, so far as it lies in the cephalothorax, appeared to the 
author to consist of a large ganglion, from which radiated branches go 
otf to the legs ; a chord passes backwards, which divides, in the abdomen, 
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