. L'Annals and magazine of natural history ; zoologie, botanique, et de la géologie. L'histoire naturelle, zoologie, botanique, géologie. 142 M. R. I. Pocock 07i les mesures en millimètres.-longueur totale 11 ; longueur de carapace 5'5, largeur 4 ; longueur de la première jambe 21, de deuxième, de troisième 16 20'5, de quatrième sur 20.. Loc. Sommet du Mont Roraima, 8500 pieds. Un mâle et une femelle immature. Le genre Aysha est essentiellement néotropical dans sa distribution. Les espèces connues ont été enregistrées à partir de Saint Domingue, Bogota et Rio Grande do Sul. Note.-d'un point de vue morphologique du genre Aysha, et, en fait,

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. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 142 Mr. R. I. Pocock 07i 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 Anyphgenidffi, 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 Anyphcena the aperture in question is placed almost in the middle of the area that lies between the generative orifice and the spinning- mammillEe. 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 Arachnomorpiite 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-mauimilla?. Leaving aside the so- called Cribellata? and Haplogynaj, and turning to the Ecri- bellate Entelegynaj *, we find that the tracheal stigmata are removed from the mammillge in a few groups, namely in the Argyronetidge, Anyphjenidge, and in two genera allied to Pachygnatha. In the case of the Anyphasnidai 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, na

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