142 Mr. R. I. Pocock on 
Measurements in millimetres.—Total length 11; length of 
carapace 5°5, width 4; length of first leg 21, of second 20, of 
third 16°5, of fourth about 20. 
Loc. Summit of Mount Roraima, 8500 feet. An adult 
male and an immature female. 
The genus Aysha is essentially Neotropical in its distri- 
bution. The known species have been recorded from 
St. Domingo, Bogota, and Rio Grande do Sul. 
Note—From a morphological point of view the genus 
Aysha, and, indeed, the entire group of the Anyphenide, is 
of considerable interest on account of the retention by the 
tracheal stigma of a more primitive position than is found in 
most dipneumonous spiders. In the genus Anyphena the 
aperture in question is placed almost in the middle of the area 
that lies between the generative orifice and the spinning- 
mammille. In Aysha, however, it is even further forwards, 
and lies, as stated in the description given above, in the 
anterior fourth of this area, that is, only very slightly behind 
the position that the tracheal stigmata occupied when first 
formed in the embryo, although showing the specialization of 
union. In most families of Arachnomorphe these stigmata 
have travelled the greatest possible distance over the abdominal 
ventral surface, and have been compelled to halt immediately 
in front of the spinning-mammille. Leaving aside the so- 
called Cribellatee and Haplogyne, and turning to the Keri- 
bellate Entelegyne *, we find that the tracheal stigmata are 
removed from the mammillz in a few groups, namely in the 
Argyronetide, Anyphenide, and in two genera allied to 
Pachygnatha. In the case of the Anyphznide and the allies 
of Pachygnatha the abnormality is difficult to explain ; but in 
Argyroneta it is probably connected with the aquatic life of 
the animal. There are, however, other spiders which are 
known to live in the water, namely Deszs and Robsonia, which 
* T here use these terms merely for convenience’ sake, and without in 
any os wishing to pledge myself to a recognition of the groups they 
signify. 
