172 Transactions. — Zoology. 



Fam. TETBAGNATHID^. 

 Gen. Tetragnatha, Latr. 

 Tetragnatha tenella, sp. nov. 



Mas. — Ceph.-th.,long, 3; wide, 2. Abd., long, 7-3; wide, 

 1-3. Legs, 1, 2, 4, 3 = 33, 28, 24, 16-8 mm. 



Cephalothorax delicate pea-green ; clothed with very fine 

 adpressed light and erect black hairs ; pars cephalica de- 

 pressedly convex, roundly truncated ; lateral index equals 

 facial ; depth of clypeus equal to interval dividing the fore- 

 centre eyes ; pars thoracica depressed, moderately dilated ; 

 fovea deep, longitudinal ; radial and caput striaB somewhat 

 shallow ; profile-line almost horizontal, dips across first half 

 of caput. 



Posterior row of eyes slightly recurved, distributed at 

 about equal distances ; centre-pair intersect acute-oval black 

 spots ; anterior row, viewed from above, sensibly procurved ; 

 median pair black, on black rings, much the smallest of eight ; 

 separated by fully an eye's interval ; laterals about one- 

 fourth larger than posterior median pair, have their pearly 

 lustre, encircled by lake-black rings ; rather more than their 

 diameter apart ; anterior pair posited on somewhat prominent 

 tubercles, projecting forwards and outwards. 



Falces normal green ; subcorneal, anterior half inclined 

 outwards, project rather prominently forwards ; somewhat 

 stouter than the femur of a fore-leg. 



• Maxilla pale pea-green, fore-half mottled with lake ; 

 basal half somewhat gibbous, enlarged at insertion of palpus ; 

 distal half of somewhat even breadth, pointed ; inclined some- 

 what towards each other. 



Labium pea-green ; linear-oval, apex emarginate. 



Sternum similar tone ; oval. 



Legs have the normal pea-green shade ; slender, do not 

 differ much in strength ; hairs very sparse ; femoral, tibial 

 and metatarsal joints fairly well armed with light -brown 

 slender spines ; long on two latter articles ; patellae project 

 two short bristles ; superior tarsal claws long, curved at 

 extremity ; outer claw about 25, inner about 40 teeth increas- 

 ing gradually in strength ; inferior claw sharply bent, 2 long, 

 nearly equal, backward-curved teeth. 



Palpi and legs concolorous ; tolerably stout ; pars hume- 

 ralis = 3mm., as long as tarsus of a fore-leg; of somewhat 

 even breadth, arcuated ; armed with 4 or more spines ; pars 

 cubitalis short, somewhat campanulate ; bristle at apex ; radial 

 joint 2mm. in length, cylindrical, somewhat incrassated at 

 base ; extremity on outer side subfree, triangular, margin 

 beaded ; contiguous to latter projection is a stout, fuscous- 

 tipped, forward-curved process, furnished with a cilia-like crest 



