igil] NORDAMERIKANISCHE HyDRACHNIDEN. 285 



the basal segment bears a somewhat pointed stigmatal papilla. The 

 mandibular claw is 43/i long, strongly hooked and gradually thickened 

 towards its free extremity. 



The egg has a globular form and a diameter of 90/x. 



In the undulate front margin of the bridge of the eye-plate this 

 species strikingly recalls E. undidosa Koen., though the latter species 

 is distinguished by the much greater dimensions of the eye-plate (eye 

 capsule 232/i. long, breadth of bridge 398/*) ; and the anterior eye-lens 

 also differs in having a long stalk. The pharynx of this latter species is 

 very considerably narrowed cephalad, owing to the greater breadth at 

 the posterior end (250/x), thus giving the lateral margins a strongly 

 convex form. 



Locality — Pond in the vicinity of Dechenes. 

 Eylais triangulifera Koen. 

 Syn. Eylais extendens Koenike: Abh. Nat. Ver. Bremen, 1895, XIH Bd., 

 S. 171. 



Eylais triangulifera Koenike: Abh. Nat. Ver. Bremen, 1897, XIV 

 Bd., S. 289. 



Male. 



The eye capsule is about 200/t long and 140/* broad; the eye-plate 

 about 315/* broad. Behind the bridge, which is about 35/u. long and 60/* 

 broad at the middle, the capsules are nearer together than in front of 

 this structure. On the front margin of the bridge, on each side, is a 

 stout, rounded prominence, on which are situated the minute plates that 

 bear the bristles of the bridge. Of the bristles themselves I can give no 

 particulars as they are broken off on both sides in the single specimen be- 

 fore me. The middle part of the front margin of the bridge forms a 

 rounded projection (Fig. 6). On the under side each capsule presents 

 a triangular opening of moderate size, whose marginal thickening has a 

 considerable breadth though but little elevated. The anterior eye-lens 

 including the short stalk has a length of 50/* and in its outer globular 

 part a diameter of 43/^. 



The capitulum including the pharynx is about 600/^ long and 300/i 

 broad behind the oral aperture. The oral area, which is almost circular 

 in its outer ring, has a diameter of ii6yu,. The oral fringe (Mundkrause) 

 forms a transverse ellipse. The capitulum is deeply and angularly 

 excavated in front and has an angular form in this part, when viewed 

 from the ventral side, the antero-lateral margins of the sockets for the 

 articulation of the palpi being truncated, as in the same structure in 

 E. desecta. Behind the oral area the maxillary shield has a length of i66/x. 

 Its lateral margins are straight, converging to the bases of their posterior 

 processes. Only about the oral area is the maxillary shield coarsely 



