ra and Species of British Spiders, etc. 445 



II. Ccphalothorax divided into three parts by- 

 two grooves ; legs I. and II. with a 

 trochantin Chernes Mongc. (5) 



TABLE B.— SPECIES. 



(i) Gen. Obisimn. 



A. Ccphalothorax reddish. Fixed fang of 



fakes with small teeth and movable 



fang with a high rounded tubercle. .^ 



Limbs of the forceps of the palpus 



longer than the bulb. 



I. INledian process of the cephalothorax : 



obsolete. Bulb of palpus variable, 

 more or less tumid, and moderately 

 long ; teeth of fixed limb of forceps 

 equal in size, those of movable limb 

 distinct. Size 2-8 mm muscoriim Leach. 



II. Median process of cephalothorax 



prominent. Bulb rather long and 

 broad ; teeth of fixed limb of forceps 

 imequal in size, those of movable 

 limb almost obsolete. Size 3.3 mm. carpentei-i H. \\'. Kew.* 



B. Cephalothorax brown' sh. Limbs of the 



forceps of palpus about equal in length 

 to the bulb. 



I. Median process of the cephalothorax 



prominent. Bulb not so stout, some- 

 what oval ; humeral joint of palpus 

 longer in proportion to the cubital 

 joint. Fixed fang of falces with large 

 teeth and movable fang with a long, 

 low, subangular tubercle maritimuui Leach. 



II. Median process of cephalothorax ob- 



solete. Bulb stout ; humeral joint 

 shorter in proportion to the cubital 



joint sylvaticuin C. L. Koch. 



(2) Gen. Chthoniits. 



A. Limbs of forceps a little longer than the 



bulb ; bulb with a depression near the 



base of the fixed limb tetrachelatits Preyss. 



B. Limbs of forceps much longer than the 



bulb ; bulb without this depression. 



I. Bulb of same colour as the rest of the 



palpus ; limbs of forceps straight. 



1. Size smaller, under 2 mm. ; eyes one 



diameter apart ; cephalothorax a 



little wider in front than behind . . oythodactyUis Leach. 



2. Size larger, over 2 mm. ; eyes nearly 



two diameters apart ; cephalo- 

 thora.x much wider in front than 

 behind ; falces with a small obtuse 

 projection near the end of the 

 movable fang rayi L. Koch. 



II. Bulb black brown, rest of palpus yellow 



lirovvn ; limbs of forceps very slightly 



curved tenuis L. Koch. 



* O. muscorum Leach. — Simon [' Araneides de France,' toni 7. p. 54J — 



Vide 'Irish Naturalist,' June 1910, pp. 108-112. 



;; "^ G 



xgio Dec. 1. 



