)28 Families, Genera and Species of British Spiders, etc. 



of ti^e male palpus divided into two 



brai ciacs Sub. fam. Tetragna- 



THIXAE. 



B. jNIaxillae as wide or wider than long. 



Digital joint of the male palpus undivided Sub. fam. Argiopixae. 



1. Sub. fam. Tetragnathixae. 



A. Fold of the under abdomen curved 

 .strongly backward. Sexual organs 

 very simple and genital aperture 

 placed some considerable distance 

 behind the openings of the laminal 

 traciieae. 

 I. ]\Iaxi]lae more or less converging, not 

 prominent externally. Legs sliort 

 without spines. Lateral eyes touch- 

 ing Pachvsnatha Sund. 



IL Maxillae straight, prominent exter- 

 nally. Legs long with spines. 

 Lateral eyes not touching. 



1. Both rows of eyes nearly straight, 



but laterals on same side closer 

 than anterior centrals are to 

 posterior centrals Tetragnatha J-atr. 



2. Rows of eyes nearly equally curved 



in opposite directions, so that 

 laterals on same side are farther 

 from each other than the anterior 

 centrals are from posterior centrals Eugnntha Sav. 

 B. Fold of the under abdomen straight. 

 Sexual organs a little more complex, 

 and genital aperture placed between 

 the laminal tracheae. Lateral eyes 

 touching. 

 L Eyes sub-equal. Clypeus narrow . . Meta C. L. Koch. 

 IL Anterior central eyes much smaller 



than all the rest. Clypeus wide . . Nesticus Thor. 



IL Sub. Fam. Argiopinae. 



A. Posterior row of eyes curved. 



L Both rows curved strongly forward 



Labium very obtusely triangular. . Cydosa Mengc. 



II. Both rows curved backwards. Labium 



-sem.i-circular Thericfiosorua Cb. 



B. Posterior eyes straight, or nearly so. 



I. Legs IV. longest Ccrcidia Thor. 



II. Legs I. longest. 



( 1 ) Labium nearly as long as wide, 



narrowed and obtuse at extremity Zilla C. L. Koch. 



(2) Labium wider than long, semi- 

 circular. 



[a] Anterior central eyes much 

 nearer to each other than to 



the laterals Epeiva Walck. 



(h) Anterior eyes more nearly equi- 

 distant, 

 (i.) Anterior centrals larger than 

 the posterior centrals. 

 Thoracic impression trans- 

 verse, straight or curved 



forward Singa C. L. Koch. 



Naturalistj 



