

THE MYRIAPODA OF NORTH AMERICA. 



163 



vinced mc that that naturalist had a specimen with reproduced hind feet ; yet it is worth 

 while to append his description, so that the correctness or incorrectness of this opinion 

 may be more easily shown.* Length 2 J inches. 



TABLE SHOWING VARIATIONS IN SPECIFIC CHARACTERS. 



Number of 

 .specimen. 



26' 



268 



Labial teeth. 



a rcprod. 

 4 

 4 

 4 

 4 

 4 

 4 



Spines on inner surface 

 of basal articulation of 

 posterior pair of legs. 



3 

 5 

 5 

 4 

 5 

 ? 



5 



Spines on lower surface of 

 basal articulation of pos- 

 terior pair of legs. 



10 



8 

 8 

 8 

 7 

 v 



7 

 9 



Spines on termi- 





nal angular pro- 



Spines on lateral 



cess. 



anal appendages. 



2 



3 



2 



g 







1 



3 



2 



8 



2 



4 



V 



5 



6 



4 



6 



4 



JIah. Illinois. — It. Kcnnicott.— Smithsonian Collection. — Massachusetts Museum Comparative Zoology. 



S. LONCIIPES. 



S. eastanca, robusta; capite castaneo, magno; sogmento cephalico ovato, sparse minute punctata : segmento 

 basali maximo; antennis 17 artioulatis; tuandibulorum dente t'ubcrculoquc magnis ; laminis dcntalibus margine 

 antico fere recto; dentibus 6, nigris, magnis, utrinque duobus intimis coadunatis, extcrno sojuncto, conico; seutis 

 interdum posticc viridi marginatis ; spiraculis anticis maximis ; pedibus luteolis, longis, compressis, paris penultimi 

 artioulo basali spinis 5 in processu angulari terminali alterisquo 1 — 2 armato; pari postremo valde clongato, sub- 

 cylindrico, baud comprosso, artieulo basali tibiali multo longiore, 30— 45 spinis longitudinaliter seriatis armato; 

 processu angulari magno, spinis 6 — 8 ; appendicibus analibus latcralibus dense punctatis, elongatis, singula spinis 

 apicalibus 8 — -12 et interdum alteris marginalibus 1 — 4. 



Chestnut, robust ; head chestnut, large; cephalic segment ovate, sparsely minutely punctate; basal segment 

 very large; antennce 17 articulate; mandibular tooth and tubercle large; dental lamina with their anterior margin 

 almost straight ; teeth 6, black, large, the two inner on each side coadnate, the external distant, conical ; scuta 

 sometimes margined posteriorly with green; anterior spiracles very large; feet yellowish, long, -compressed, basal 



* " S. inequidentu (S. iNiUQUiDENs). — Tete subcordiformc un peu-6Iargic ; doubles strics dorsales paralleles 

 continues en dossus, assez peu marquees ; bord posterieur du dernier segment triangulaire obtus ; strics inferiours 

 faiblemcnt divcrgentcs ; plaques des segments subarrondios a, leur bord posterieur; plaque proanalc quadrilatcro 

 etroite fl, bord post6rieur plus etroit que l'anterieur, droit; angles subarrondis ; pieces laterales terminecs en epine 

 multifide tres-finement ponctuccs ; antennes longues, nucs ; sallies dentifores finement ponctuccs, a trois dent 

 indgales, l'interne large, a bord libre rectiligne, la mitoyennc peu distinctc, subarrondic, 1'externc separee par un 

 cspace plus grand ; pieds de derriere assez longs, forts, subarrondis, cpincux en dossous et a la face interne ; 6 

 opines environs en dessous; et a peu pres 14 au bord interne, la dorniere multifide, & sept potites pointes inegales 

 en couronno. Couleur fcrrugineuse un peu nuancee de verdatre ; antennes piles ; tete, segment foreipulaire et 

 partie posterieur plus ferrugincuse. Longeur de corps, 0.190; plus grande largcur, 0.022. Antennes, 0.035 ; 

 pieds do derriere, 0.035." 



" Des Etats Unis, a, New-York, par M. Milbert (Museum de Paris, 1824)." 



