> A SYNOPSIS OF THE BRITISH SYMPHYLA 



2. Posterior lobes of the thirteenth dorsal scutum each furnished 

 with a process longer than broad and overlapping the 

 fourteenth scutum ; surface of the fourteenth scutum without 

 setae, excepting a conspicuous series protecting the cavity. 

 Other seta; larger and less closely placed, especially on the 

 cerci. Cerci about two and one-half to three times as long 

 as broad at base. Tactile setae on the last segment longer 

 than the cerci ; rather strong. biscutata, Bagnall. 



II. Last dorsal scutum without such median cavity, but sometimes 

 with a simple depression in its place. 



1. All setae on dorsal scuta (excepting an antero-lateral pair on 



the first scutum) backwardly directed, rather short and 

 fusiform, i.e., blunt and broadest at about middle. Antenna; 

 long and slender, composed of thirty-eight or more joints. 

 Seta; on surface of cerci rather long and closely set. 



hanseni, Bagnall. 



2. All seta; normal ; second scutum with a pair of forwardly 



directed antero-lateral setae, at least twice as long as any of 

 the other lateral seta?, which are backwardly directed. 

 Antennae shorter, composed of thirty joints or less. 



a. Setae on surface of cerci numerous, closely set, and the 



distal ones shorter than one-half the depth of the 

 cercus. Second dorsal scutum with the posterior 

 margin slightly convex ; first, third, fifth, sixth, and 

 eighth scuta each with a pair of rather long forwardly 

 directed antero-lateral setae, and two pairs of lateral 

 setae (longer than the other lateral setae) as in the 

 second scutum. Penultimate scutum posteriorly con- 

 spicuously emarginate with broadly rounded lobes. 

 Antennal joints varying from twenty-three to twenty- 

 eight, caldaria, Hansen. 



b. Setae on surface of cerci few, widely set, and some of 



the distal ones longer than the depth of the cercus. 

 Second dorsal scutum with the posterior margin 

 straight or very faintly emarginate ; first, third, fifth, 

 sixth, eighth, ninth, eleventh, and twelfth scuta each 

 with a pair of long outwardly directed setae about as 

 long as those on the second scutum. Penultimate 

 scutum posteriorly very slightly emarginate, and with 

 a pair of long backwardly directed postero-lateral 

 setae. Antennal joints varving, according to Latzel, 

 from twenty to thirty. [nivea (Scopoli).] 



