Mr. T. Workman on txoo new Species of Spiders. 451 



I'iff. 17. Sei-tularia co7npressa, sp. n. : two small colonies upon a stem of 



Selaginopsis pinnata, natm-al size. 

 Fig. 18. A branch of the same species, enlarged 25 diameters, dl•a^^■n 



with the camera lucida : X , the neck bent nearly at a right angle 



to the axis of the branch. 

 Fig. 18 a. A hydrotheca of the same species, seen from the flat side (in a 



plane vertical to the plane of ramification) . 

 Fig. 19. A hydrotheca seen from the side, enlarged 75 diameters ; drawn 



with the camera lucida. 

 Fig. 19 a. The aperture and a part of the side of the hydrotheca of the 



same species, enlarged 50 diameters. 

 Fig. 20. Sertidarella Clarkii, sp. n. : a colony, of the natural size. 

 Fig. 21. A portion of the colony of the same species, enlarged 50 diameters ; 



drawn with the camera lucida. 

 Fig. 22. A portion of the colony of the same species, represented dia- 



grammatically, to show the mode of ramification : a, the princi- 

 pal stem ; b, a primary branch ; c, secondary branches, bearing 



branches of a third category. 

 Fig. 23. SertulareUa pinnata, S, F. Clarke : a colony, of the natural size. 



XLIX. — Descriptions of two new Species of Spiders. 

 By T. Workman, Esq. 



[Plate XVIII. figs. 1 & 2.] 



PJiolcus Margarita^ n. sp. 



? adult, length 9 millims. ; 6 rather shorter. 



Cejjhalothorax. Length 1 millim. ; round, rather squared ; 

 colour yellow, with two black lines in front from the eyes to 

 the falces, also a dark brown band with black margins from 

 the eyes to the abdomen, broadest behind, sparingly covered 

 with hairs. 



Eyes eight, seated on dark spots; the two anterior are the 

 smallest ; those of the lateral groups are about equal in size, 

 which groups are placed about the breadth of one of the eyes 

 apart. 



Legs very long and slender, provided with short fine hair§ ; 

 relative length of legs of male 1,2,4,8; total length of an- 

 terior legs 63 millims. Colour yellow, with white markings 

 at the end of the femur and tibia, the end of the genual joint 

 dark brown ; superior claws of tarsus deeply pectinated. 



Palpi short, strong ; colour yellow. Palpal organs of male 

 well developed, but simple in structure, having a sort of coni- 

 cal tube projecting downwards with black points, as seen from 

 outer side ; female palpi terminated with two simple claws. 



Falces short, vertical ; colour brown ; armed on inner edge 

 with a short strong spine. 



30* 



