162 THE MYRIAPODA OF NORTH AMERICA. 



United States. Say's descriptions are absolutely no guides to the species intended. M. 

 Gervais adopts Say's species as good, and gives the following synonymy :* 



"S. MARGINATA, Sai/, Journ. Acad. Nat. Sci., t. ii, p. 100, &c. 



S. morsitans, partim, Newp., Trans. Linn. Soe. London, t. xix, p. 379." 



Length 4 inches. 

 Hab. Florida? 



S. IN.-EQUIDENS. 



S. viridi-brunnea; segmento-cephalico punctata, parvo, basali magno postice subtruncato; antennis interdum 

 viridibus, pubescentibus, 17 articulatis ; labio mandlbulisque sparse subprofunde punctatis ; lamiuis dentalibus 

 elongatis; dentibus G — 8, utrinque iutimis duobus arete coadunatis, duobus externis sejunctis, acutis ; scutis in- 

 terdum postice saturate viridi aut cocruleo marginatis ; pedibus luteolis, gracilibus, longis ; postremis robustis, 

 articulo basali supra subconvexo, intus 3 — 8, subtus 7 — 10 spinis ; processu angulari 2 — 6 spinis; appendicibus 

 analibus lateralibus dense profunde punctatis, elongatis, .spinis apical ibfls 3 — 5. 



Greenish-brown ; cephalic segment punctate, small, basal large posteriorly subtruncate ; antennre sometimes 

 green, pubescent, 17 articulate; labium and mandibles sparsely sub profoundly punctate; dental laminae elongate; 

 teeth 6 — 8, on each side, the two inner closely coadnate, two external distant, acute ; scuta sometimes margined 

 posteriorly with deep green or blue; feet yellowish, slender, long, the last pair robust, with the basal joint above 

 subconvex, within 3 — -8, beneath 7 — 10 spines; angular process 2 — 6 spines; lateral anal appendages densely 

 profoundly punctate, elongate, with 3 — 5 apical spines. 



S. INiEQtJiDENS, Gervais, Suit, a Buffon, Apteres, vol. iv, p. 277; Exp. Amer. Sud. (Castelneau) Myriap., p. 30. 

 " " Wood, Journ. A. N. S., new series, 18C3, vol. v, p. 25. 



The cephalic segment is small, truncate posteriorly, and has its sides remarkably straight. 

 The basal segment is very large, fully half again as broad as the cephalic. The antenna? 

 are sometimes green or blue, and in all of our specimens pubescent on their distal portion. 

 Their joints arc short and almost globose. The scuto-episcutal sutures are well marked, 

 but not so strongly as the sterno-episternal. The legs are slightly compressed. The 

 basal joint has all of its margins well defined, so that it is scarcely subcylindrical, but 

 rather subparallelopipedal. Tire spines are arranged in rows on elevated bases, so as to 

 give the appearance of being on an interrupted crest or raised hue. The apices of the 

 lateral anal appendages arc much prolonged, slightly curved upwards, impunctate and 

 almost diaphanous. This species is separated from its southern representative, by the 

 more rectangular and smaller cephalic segment and the larger basilar, by the more monili- 

 form and fewer jointed antennae, as well ;is by the differences in the structure of the lateral 

 teeth and posterior pair of feet. 1 was at first disposed to consider the specimens as re- 

 presenting a species distinct from that of M. Gervais, but further examination has con- 



' I't' " , i. iv, p. 27<'i ; el Tabl. den Myriap Americ. (V'.\}> Amer. Sud. sept, part ) p. :'.(». 



