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worth while to name it provisionally, and to describe it shortly, so 
as to assist in the identification of any other examples that may 
occur in the gardens, and I hope to give some figures of it in my 
next report in Proc. Dors, Nat. Hist. and Antiq. Field Club. 
The distribution of the genus Bolostromus, Simon, as at present 
known, is South and East Africa and South America. 
DyYSsDERIDAE, 
? Orchestina dubia, Cambr.,sp.n. Coll. H. St. J. Donisthorpe. 
Female adult, length 4 lin. 
Cephalothorax longer than broad ; of an oval form, blunt-pointed 
at its anterior extremity ; the lateral impressions at the caput are 
very slight, clypeus prominent; a slight impression in profile 
between the caput and thoracic junction ; colour brownish-yellow, 
strongly marked on the margins, and along the normal indentations 
with converging linear markings of black-brown, and a large 
irregular triangular patch of the same colour close behind the 
caput. 
smoky hue, 
The faces are tolerably strong, straight, conical. Mazillae rather 
strong, tapering, and strongly inclined over the Jabiwm, which 
appeared to be broader than long and pointed at its apex. 
Sternum round-oval, broader than long, the hinder part slightly 
produced, and truncate. This part, as also the maxillae and labium, 
are yellow-brown suffused with black-brown. 
Legs,—These were all wanting, excepting one of the fourth pair, 
which was slender, of moderate length and of a brownish-yellow 
colour, 
side darker. The form of the epigyne appeared to be a simple 
: laced this spider provisionally in the genus Orchestina, 
Simon, from which however i ; . 
a 
only was received, and that one much mutilated. A perfect 
specimen, and especially one of the male sex, would no doubt 
make its position more certain, 
here was no clue as to whence it may have come to the Royal 
Botanic Gardens, but it is no doubt an exotic form, 
