26 A SYNOPSIS OF THE BRITISH SYMPHYLA 



character, as immaculata has a series of short bristles on the 

 inside margin of the meta-tarsus (see text-figures.) The bristles 

 on the inner margins of the other legs are fewer and less con- 

 spicuous, whilst the legs of the first pair have only two dorsal 

 bristles on the tarsus, one at about the middle and one near 

 the apex. 



I think there is every justification for separating this form 

 from immaculata, the setse of the cerci and legs being more 

 strikingly developed than in the most extreme forms of 

 immaculata such as those figured by Hansen from Texas. 

 It is in fact a more strongly characterised form than the 

 Algerian form armata Hansen, and examination of further 

 material will most probably enable us to bring forward other 

 points of difference than those briefly named above. 



Distribution. — Four specimens taken with Scutigerella 

 immaculata, S. biscutata, and Scolopendrella minutissima on 

 the Durham banks of the Tees near Barnard Castle in the 

 early spring of this year (1911.) I should here express my 

 gratitude to Mr. Wm. Hall of Fatfield, who actively par- 

 ticipated in the capture of the above-named species, and has 

 helped me on other occasions when in quest of Symphyla. 



B. — Posterior lobes of the 13th scutum each furnished with a 

 process longer than broad ; surface of all scuta excepting the 

 14th covered moderately closely with moderate-sized setoz; 14th 

 scutum zvithout dorsal seta; cerci shorter and broader, and only 

 sparsely clothed with a comparatively fetv rather long setce ; 

 tactile hairs on the last segment long and rather strong. 



Scutigerella biscutata sp. nov. (PI. I., figs. 3-6.) 



Material — Numerous specimens from several localities. 



Length 3*0 mm. to 3*5 mm. 



This species is closely related to the previous form, but is 

 easily separated by the presence of the two flap-like processes 

 of the 13th scutum. The setae of the scuta are comparatively 

 longer than in spinipes, but the dorsal surface of the 14th 



