WITH DESCRIPTIONS OF NEW SPECIES 39 



The setas are few in number, sparsely set and comparatively 

 long, being about two-thirds as long as the depth of the 

 cercus. There are no long outstanding setae on the upper and 

 lower margins. The terminal area is two-thirds as long as 

 the depth of the cercus, and the apical seta is as long as the 

 dorsal length of the area. 



Distribution. — Two specimens taken under stones on the 

 Durham banks of the Tees near Barnard Castle in the early 

 spring of this year (1911.) It is a minute form and may easily 

 be overlooked. 



S. minutissima is the smallest species of the S. vulgaris 

 group, and in form of the scuta is most closely allied to 

 5". delicatula. Apart from its minute size it may be readily 

 separated by the distinctive chaetotaxy of the scuta, by the 

 fewer, longer and more sparsely set setae on the cerci and the 

 absence of the long outstanding hairs on their upper and 

 lower margins, and by the number of the outstanding dorsal 

 setae on the tibia, meta-tarsus, and tarsus of the hind leg. 

 Compared to the size of the creature the scuta are more than 

 usually large. 



