WITH DESCRIPTIONS OF NEW SPECIES J7, 



tarsus. The tarsus is somewhat stout and not quite three 

 times as long as deep. The claws are rather long and some- 

 what slender, the interior claw being shorter, more slender and 

 more strongly curved than the other. 



Cerci. — Rather small, roughly about two-thirds the length 

 of the last leg and about three and two-thirds as long as deep. 

 Set with a moderate number of setae, of which three or four 

 on both the lower and upper margins are long and outstanding, 

 the others being rather short and somewhat depressed. The 

 terminal area is more than one-half as long as the depth of 

 the cercus, and as in vulgaris, the apical seta being slightly 

 longer than the length of the area. 



Distribution. — Two examples from Fencehouses, Co. 

 Durham, June, 191 1 ; one (with fourteen antennal joints) from 

 Alwinton in Northumberland, July, 191 1, and one from a 

 quarry (with subnuda) near Penshaw, August, 191 1. I also' 

 have a second Penshaw example taken by Mr. W. Hall on 

 the Wear banks at South Biddick, June, 191 1, which is larger, 

 than the others, has the head comparatively longer and the 

 antennae with twenty-one joints. 



This species somewhat resembles subnuda superficially on 

 account of the naked appearance of the scuta. It is, how- 

 ever, most nearly related to vulgaris, and is easily separated 

 from that species by its shorter, broader head, the form of the 

 scuta and the sparse and minute nature of their setae. The 

 cercus has the long outstanding setae on the upper as well as 

 the lower margin, as in simplex Hansen, whilst the tarsus of 

 the hind leg is more robust and has only two outstanding 

 setae on the dorsal row. S. delicatula is abundantly distinct 

 from all other described species. 



DD. — Size smaller ; selec of scuta long ; second scutum with three long 

 and two small seta: on the lateral margin between the antero-lateral 

 and the apical seta, and none on the inner margin of process. Cerci 

 sparsely furnished with a few long bristles, and without the long 

 outstanding seta on the upper and lower margins. Three dorsal 

 stla on tarsus of hind leg. 



