SC/ENCEGOSS/P. 



309 



fiKNUS I.ETIIIA MKNC.K. 



The tjcniis I.flhia <:iiniains a nunilKT <if sniiiU 

 spidtTs (lislinuuishalilc frmn Diityita by the form of 

 the ccphalDthotax, which is less convex than in ihat 

 group. Legs I, 2, 4, 3, or I, 4, 2, 3, the fourth 

 and second pairs lieiny always nearly equal. 



Lethia humilis i<l. 



Length. Male, 2 mm. ; female, 2.5 mm. 



Cephalo-lhorax hrown, with a darker margin. 

 Legs pale brown, with annulations of a darker tint. 



FiC. V. Dy^dera crvcota. 



The abdomen is prettily marked with a distinct 

 pattern. The cubital joint of the male palpus has a 

 short projection on its upper side. The palpal organs 

 are rather simple. This spider is not at all un- 

 common in the South of England. 



Iiethia mengii Cambr. 



Lengtii. ^Llle, about 2 mm. 



This extremely rare spider may be distinguished 

 from the last by the absence of the projection on the 

 cubital joint of the male palpus, and by the com- 

 plexity of the palpal organs. It has only been foimd 

 in Dorset. 



Lethia puta Cambr. 



Length. I'emale 1.7 mm. 



This is similar in structure to /.. /mm ills Bl., but 

 is much smaller, and the abdominal pattern is very 

 indistinct. It is extremely rare, and is recorded 

 from Dorset. 



Ijethia albispiraculis Cambr. 



Length. Temale 2 mm. 



Very similar to the la.st specie*, but may be clia- 

 lingtiished by the colour of its spiracular plates, which 

 are brilliant white. It has been found in Dorset. 



Lethia subniger (Jambr. 



Length. Male 2. 1 mm. 



Cephalo-lhorax dark brown. Legs yellowish 

 brown. Abdomen almost black with a few pale 

 hairs. This spider is very rare. It has liccn taken 

 at Winchester. 



Lethia patula .Sim. 



Length. Kemale 4.2 mm. 



This rare spider is similar in appearance to /.. ptita 

 Cambr., but is much larger. 



Lethia spinigera Cambr. 



Length. Male 1.8 mm. 



This spider may be distinguished from the rest of 

 the genus by its possessing a spine on the tibiae of 

 the third pair of legs. 



Fig. VI. Stgestria stncculata, 



GENUS AMAUKOBIUS C. KOCIL 



The spiders of this small but important genus are 

 very similar, both in appearance and habits, to those 

 of the family .\gelenidae, with which they were 

 formerly classed. The possession of calaniistra and 

 supernumerary spinners, however, necessitates their 

 removal from that group. The caput is very slightly 

 raised, and the eyes are arranged in two transverse 

 rows as shown in fig. I\'. The three British species 

 representing this genus are all rather lai^e, two of 

 them lieing very common. 



