32 



ON THE (JIIILOPODA OF NORTH AMERICA. 



extirnis scjunctis; pedibus compressis ; pari postremo subcylindrico, gracili ; articulo basali tibiali 

 longiore, supra subooiuplanato, iutus subtusque bis vel trispinoso, proccssu angulari elongate, cur- 

 vato, quadrispinoso, articulis tibiali ct tarsali fere Eequalibus; appendicibus analibus rude punctata, 

 apicibus eloDgatis, aeutis, bispinosis; squama preanali elongata, fere subtriangulari, medio canaliculate 



Scuto-episcutal sutures traceable, sterno-episternal well marked. This species 

 differs from the preceding in the head not being so large ; the mandibles and their 

 teeth are also smaller, whilst the labial teeth are larger and more distinct. The late- 

 ral anal appendages are likewise very different, their apices being prolonged, acute 

 and scarcely curved downward at all. The three spines on the inferior aspect of basal 

 joint of posterior legs are arranged in a single row on its exterior portion. It is barely 

 possible that a. suite of specimens would show that we have confounded two species. 



S. dinodon, Wood, Proc. Acad. Nat. Sc. 1861, p. 12. 



185 | 1 | Singapore. | U. S. Expl. Exped. | | Unc. b\ \ 



S. insignis, Gervais, Ann. Soc. Entom. 1844, p. 29 ; Apteres, iv. p. 298, pi. 43, f. 4 ; Tabl. des Myriap. 

 (Exp. Aruer. de l'Sud sept, part.) p. 32, pi. v. fig. 1. 

 S. insight's, Newp., Catal. British Mus. Myriap. p. 60. 

 S. epileptica, Wood, Proc. Acad. Nat. Sc. 1861, p. 11. 



151 | 1 | ? | ? | ? | ? | Unc. 10 | 



S. septemspinosa, Brandt, Recueil p. 60 ; Newp., Linn. Trans, six. p. 391; Gervais, Apter. iv. p. 209. 



S. sexspinosa, Newp. in Ann. and Mag. Nat. Hist. xiii. p. 96; Linn. Trans, xix. p. 392 ; Gervais, Apte- 

 res iv. p. 287. 



S. parvidens, Wood, Proc. Acad. Nat. Sci. 1861, p. 13. 



We think that there is scarcely a doubt that iS. septemspinosa and S. sexspinosa are 

 identical species. To show our reasons as fully and briefly as possible, we throw the 

 principal specific characters of our specimens into a tabular form, followed by a 

 table of the characters of the two species as given by Mr. Newport. 



