34 A SYNOPSIS OF THE BRITISH SYMPHYLA 



B. — Size smaller and more slender; last pair of legs with two 

 protruding dorsal seta; on, the meta-tarsus and two or three on 

 the tarsus. Setce on margins of scuta fewer. 



AA. — Seta on scuta exceptionally long; second scutum tvith five on the 

 lateral margin and one on the inner margin of process between the 

 ant cro -lateral and apical setce and inner basal and apical seta 

 respectively. Cerci without outstanding seta on upper or lower 

 margins. 



Scolopendrella horrida sp. nov. (PI. I., figs. 21 and 22). 



Allied to S. isabelloz and S. vulgaris; about 2*0 mm. in 

 length ; slender. 



Head as in above-named species, but marginal setae com- 

 paratively longer. 



Antenna; in type specimen with fifteen joints, so strongly 

 contracted that up to now I have been unable satisfactorily to 

 determine the secondary whorl. 



Scuta. — The second and third scuta (fig. 21) are shaped 

 almost as in vulgaris; the processes of the second about as 

 long as broad, and of the third slightly shorter than broad. 

 The distance between the processes of the former scutum is 

 a little more than the length of the process, and of the latter 

 more than twice as long as the length of the process. The 

 setae are much longer than usual ; there are five on the lateral 

 margin of the second, and three on that of the third scutum 

 between the long antero-lateral seta and the apical one, and 

 two on the inner margin of the processes, including one at the 

 angle. The antero-lateral seta? are about one-third longer 

 and the other lateral setae are either quite as long as or only a 

 little shorter than the processes. 



Legs. — The last leg is moderately or rather long, with the 

 tarsus at least four times as long as deep. The type 

 specimen has the hind legs tucked in under the body, with 

 the fore margins of the tarsi touching ; I have therefore been 

 unable to determine exactly the nature of the chaetotaxy and 

 claws. There are two outstanding setae on both the tibia and 

 metatarsus, and I think, but am uncertain, that there are three 



