THE MYRIAPODA OF NORTH AMERICA. 165 



coadnatc; feet slender, yellowish, moderately compressed ; last pair of feet above complanate, below strongly con- 

 vex, superior margins, both external and internal, acute; basal joint longer than the tibial, both on the inner and 

 lower surface bi- or tri-spinous, angular process bifid or trifid ; ventral surface brownish-olive ; lateral anal appen- 

 dages densely profoundly punctate, rather elongate, each with 2 — 3 apical spines, apex not incurvate. 



S. BYSSINA, Wood, Proc. Acad. Nat. Sci., 1861, p. 10; Journ. A. N. S., 1863, p. 26. 



The head is of moderate size. The dental lamina are rather broad, their teeth small, 

 almost tuberculiform. The scuto-episcntal sutures are traceable, but not so distinct as the 

 sterno-episternal. The first scutum is very short, the penultimate very large, with its 

 sides strongly arched. The legs are slightly compressed. One brown specimen has some 

 of its scuta margined posteriorly with green. This species differs from subspinipes in the 

 shape of hind pair of legs, which are parallclopipedal, and have the margins much more 

 acute, as well as in the proportionate length of the basal and tibial joints. How far these 

 characters are specific is not certain, and it is very possible that this species does not 

 deserve to rank higher than a variety. Large suites of specimens can alone decide this. 



The habitat of S. byssina is uncertain. Originally it was described as doubtfully living 

 in Florida. Then specimens were found in the Smithsonian Collection labelled California. 

 Since then others have come to light labelled Florida. It is hardly possible that the 

 species is common to the two countries, and which is correct I am at a loss to decide. 

 Length 1\ inches. 



S. COPEANA. 



S. luteolo-castanea prasino sparsa ; capite sparse minute punctata; segmento cephalico parvo, subrotundo, con- 

 vexo; basali magno ; antennis 25 articulatis; labio rubri-castaneo ; laminis dentalibus subelongatis, margine 

 antico fere recto; dentibus 8, nigris, utrinque duobus iutimis coadunatis, extimis duobus majoribus, conicis, 

 sejunctis; pedibus luteolis, modice eompressis; pari postremo robusto, articulo basali tibiali vix longiore, supra 

 complanato, intus 4 — 6 spinis, infra 9 — 17 spinis in serie cpuadruplici (interduni inordinatim) dispositis; processu 

 angulari spinis 2 — 5 ; appendicibus analibus lateralibus dense profundeque punctatis, singula spinis apicalibus 

 3 — 5, et marginalibus 1 — 3 ; superficie ventrali sordide luteola. 



Yellowish-chestnut, sprinkled with light green; head sparsely minutely punctate; cephalic segment small, sub- 

 round, convex ; basal large; antennae 25 articulate ; labium reddish-chestnut; dental laminae subelongate, with 

 their dental margins nearly straight; teeth 8, black, the two inner on each side coadnate, the two external larger, 

 conical, distant; feet yellowish, moderately compressed; last pair robust, basal article scarcely longer than the 

 tibial, above complanate, within 4 — 6 spines, below 9 — 17 spines arranged in a fourfold series (sometimes irregu- 

 lar) ; angular process with from 2 — 5 spines ; lateral anal appendages densely profoundly punctate, each with 

 3 — -5 apical spines and 1 — 3 marginal ; ventral surface a dirty yellow. 



S. copeana, Wood, Journ. Acad. Nat. Sci., New Series, vol. v, 1863, p. 27. 



The head is somewhat peculiar ; it is not so broad as the posterior portion of the body. 



