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I to VI, The six leg-bearing somites of the prosoma. opisth 1, First or genital somite of the opisthosoma. ge, Site of the genital aperture. st, Thoracic tracheal aperture. l2, Anterior tracheal aperture of the opisthosoma in somite 2 of the opisthosoma. l3, Tracheal aperture in somite 3 of the opisthosoma. a, Anus.

Opisthosoma 309 composed, at least in many cases, of eleven somites, the 11th somite very small, often hidden within the both.

A movable membranous joint between the prosoma and the opisthosoma, the generative aperture opening upon the ventral side of the membrane.

Opisthosoma confluent throughout its breadth with the prosoma, with the dorsal plate of which its anterior tergal plates are more or less fused; at most ten opisthosomatic somites traceable; the generative aperture thrust far forwards between the basal segments of the 6th appendages.

C, Ventral surface of the prosoma and opisthosoma; a, tracheal stigma; b, last somite.