CLASSIFICATION OF THE ORDEK SYMPHYLA. 197 



Family Scolopbndrellid^. 



Species usually larger and more robust, with the first pair of legs always 

 well developed and more than half the length of the following pair ; the 

 exopods well developed and conspicuous. 



Posterior margins of all the dorsal scuta bat the last slightly rounded or 

 emarginate, with angles generally broadly rounded, rarely angular (but 

 when angular each lobe is several times broader than long). 



Dorsal surface of the hind pair of legs usually furnished with numerous 

 setEe. Cerci simple, that is, without striped terminal area or transverse 

 lines at apex Subfamily Scutigbrellin^, mihi. 



2. Species smaller and more slender, with the legs of the first pair rarely more 

 than one-half the length of those of the following pair (^S. notacantha is the 

 only exception), and more usually vestigial ; none of the exopods well 

 developed. 



Posterior margins of all the dorsal scuta but the last one produced into a 

 pair of triangular plates. 



Dorsal surface of the hind pair of legs furnished with very few setse. Cerci 

 usually with a striped terminal area, and often, in addition, with raised 

 transverse lines on the most distal part outside the area. 



Subfamily Scolopendrellin^, mihi. 



Subfamily Sccjtigerellin^, mihi. 



1. Last dorsal scutum with a very deep and somewhat large cavity overlapped 



anteriorly and situated in the middle of the posterior margin. No long 

 outstanding setas on lateral margins of scuta Genus Scutigkrella, Ryder. 



Last dorsal scutum without such median cavity 2. 



2. All setae on scuta, excepting an antero-marginal pair on the first scutum, 



short, blunt, and fusiform Genus Neoscutigerella, nov. 



All setae normal. The second .scutum (and certain others) furnished with 

 at least one pair of longer, forwardly or laterally directed, latero-marginal 

 setae Genus Hanseniella, nov. 



a. The last scutum slightly depressed posteriorly along the middle. The 

 exopods of posterior legs well developed. The setae on the inner 

 side of the proximal antennal joints directed obliquely forwards and, 

 at most, about one and one-half times as long as the setae on the 

 outer side Subgenus Hanseniella, s, str. 



h. The last scutum with a deep postero-median depression. The exopods 

 of posterior legs short, at most much shorter than the depth of 

 tarsus. Some setfe on the inner side of the proximal antennal joints 

 nearly vertical to the longitudinal axis of the antennae and unusually 

 long, the longest at least two and one-half times as long as the setae 

 on the outer side Subgenus Scolopendrelloides, nov. 



17* 



