196 ME. E. S. BAGNALL ON THE 



main groups, here treated as subfamilies but which might in future be 

 readily given family rank, and that each contains at least three strongly 

 characterized genera. 



In the Scutigerellinse (as I propose to name the first group) I was 

 fortunate enough to collect two new species of the immacidata-^YOup, which 

 makes it safe to deal with immaculata as a type distinct from the nfy^a-group. 

 In fact, although Hansen (in litt.^ has always regarded Scutigerella as more 

 difficult to deal with than Scolopendrella, this material has enabled me to 

 tabulate the genera of the Scutigerellin?e in unmistakable characters. 



In Scutigerella, s. str., the postero-median cavity of the last dorsal scutum 

 is peculiar and is endorsed by the absence of the long outstanding antero- 

 lateral or lateral scutular setae. In this genus we find two species each 

 possessing a distinctive character which does not reappear in succeeding 

 groups, — arniata, Hansen, having each fore-femur armed with a distinct 

 tooth, and hiscutata, Bagn., possessing a pair of plate-like prolongations 

 hinged to the 13th dorsal scutum. 



The second genus, Neoscutigerella, is erected for the English species 

 S. Hanseni, Bagn., and in the character of its scutular setse stands alone. 

 The absence of the postero-median cavity of the last abdominal setse precludes 

 its reception in the genus Scutigerella, but here, too, the possession of 

 longer, outstanding, and presumably sensory set?e is not shown. A second 

 species of this genus (from Ceylon) is in my possession. 



In the third and last genus, Hanseniella, the long outstanding seta3 of the 

 scuta appear for the first time, and this feature is continued throughout the 

 genus and throughout the genera of the second subfamily, Scolopendrellinse. 

 In the %\}hgQi\n^ Scolopendrdloicles {yxhich may ultimately be split off from 

 Jlanse7iiella, s. str.), as exemplified by two species, w^e find three common- 

 characteristics of which two are noteworthy. Firstly the somewhat deep 

 postero-median depressions of the last scutum suggests the curious cavity in 

 Scutigerella, whilst the shorter exopods of the posterior legs lead one naturally 

 to the Scolopendrellinse. 



Scolopendrella, s. str., in the well-developed legs of the first pair present a con- 

 necting link also, and this pair in the next genus, ScolojyeJidrellopsis, is there 

 also but smaller, and in Sgrnphj/lella is obsolete. Whilst I have accepted 

 Silvestri's genus Sympliylella, I should here point out that as yet I have not 

 succeeded in perceiving any valuable character other fhan the absence of its 

 first pair of legs to warrant its separation from Scolopendrellopsis (but I have 

 only examined the one species suhiuda, Hansen), wdiilst from my table it 

 will be seen that these genera cannot possibly be included in the genus 

 Scolopendrella, being separated by the strongest morphological characters. 



I name the genus Hanseniella in honour of one of our foremost zoologists. 

 Dr. H. J. Hansen, of Copenhagen, whose friendship and help I am proud |to- 

 acknowledp'e. 



