1901.] H.EV. O. PICKARD-CAMBBIDGE ON EXOTIC SPIDEES. 11 



2. On some new and interesting Exotic Spiders collected by 

 Messrs. G. A. K. Marshall and R. Shelford. By the 

 Rev. OcTAvius Pickard-Cambridge, M.A.^ F.R.S.^ &c. 



[Eeceived December 6, 1900.] 



(Plate V.i) 



Order ARANEIDEA. 



Earn. D E A s s I D .E. 



Gren. Peosthesima L. Koch. 



Peosthesima albomaculata, sp. n. (Plate V. tigs. 2-2 c.) 



Adult female, leugth 2^ lines (4'o mm.). 



CepJialothomx flattish, oval, truncate at each end, fore end 

 rather the narrowest, lateral marginal impressions at caput very 

 slight, profile-line nearly level. Colour deep black-brown, softening 

 to yellowish brown round the thoracic indentation ; surface thinly 

 covered with grey adpressed hairs. 



Eyes in tivo transverse rows of very nearly equal length. Curve 

 of posterior row slight and its convexity directed backwards. 

 Anterior row almost straight, laterals of this row largest of the 

 eight, the two centrals being placed on a slight prominence, 

 and further from each other than from the laterals. The two 

 centrals of the posterior row are much further from each other 

 than from the laterals and are slightly the largest. The four 

 centrals form a quadrangle as long as broad, the fore side being 

 shortest. 



Legs moderate in length and strength, 4, 1, 2, 3. Colour 

 yellow to yellow-brown ; the tibiae, femora, and genuse of the first 

 pair black-brown, these joints of the second pair yello\\--brown, 

 and of the third and fourth pairs more or less deeply marked 

 longitudinally and suffused with black and brown, furnished with 

 coarse hairs and spines, the latter most numerous and strongest 

 on the tibiae and metatarsi of the third and fourth pairs. 



Falces, maxillce, and lahium deep brown. 



Sternum oval, pointed behind ; colour reddish yellow-brown. 



Abdomen oval, somewhat flattened, black, with four conspicuous 

 white spots forming a quadrangle on the fore half of the upperside, 

 the two hinder spots largest and nearly round, the anterior, near 

 the fore margin, oval or subtriangular and forming a shorter 

 transverse line than the hinder spots. On each side of the under- 

 side, about the middle, is a large somewhat irregular triangular- 

 shaped white patch, whose inner angles are nearly contiguous a 

 little way behind the middle. Spinners of the inferior pair much 

 wider apart than the superiors. Genital aperture simple but 

 chai'acteristic in form. 



Hah. Salisbury, Mashonaland, S. Africa, 5000 feet, Nov. 1898 

 to Jan. 1899 {G.A. K. Marshall). 



' For an explanation of tlie Hate, see p. 16. 



