THE MYRIAPODA OF NORTH AMERICA. 



187 



and sterno-episterna] sutures ; preanal scale deeply canaliculate, posteriorly strongly cmarginate, posterior angles 

 subacute. Length, 3 inches. 



S. laticeps, Wood, Journ. A. N. 8., new scries, 1863, vol. v, p. 49. 



The anterior of the two scuta covering each segment is very distinct from the other, 

 and is much wider at its posterior than at its anterior margin. The posterior has its lateral 

 margins arcuate but not elevated. The scuto-episcutal sutures are very distinct. Pos- 

 teriorly there is an obsolete dark median dorsal line. Length, 3 inches. 



Sab. Texas. — Museum of Comparative Zoology; George Stolloy, Esq. 



S. OEPHALICA. 



S. sordidc dilute brunnca, supcrficie dorsali lineis pullis duabus, obsoletis ; corporc antice leviter sed postice 

 illioo valdeque angustato; capite magnoj segmento cephalico subtriangulare, inipunctato, basali postice leviter 

 dilatato; antennis brevissimis, latis, dopressis, haud pilosis, articulis brevissimis, nonnihil quadratis; labio im- 

 punctato, medio canaliculate, antice leviter emarginato; mandibulis crassis, haud dcntieulatis ; suturis scuto-epis- 

 cutalibus nonnihil obsoletis; pedibus graeilibus, modice brevibus, haud pilosis, utrinque 75, pari postremo (in 

 femina solum ?) parvo, graeile; sternis suturis sterno-episternalibus ct sulco mediano imprcssis. 



Dirty light brown; dorsal surface with two obsolete, blackish linos; body anterior slightly, but posteriorly 

 quickly and strongly narrowed ; head largo; cephalic segment subtriangular, impunctato; basal posteriorly slightly 

 dilated; antennae very short, broad, depressed, not pilose, with very short, somewhat quadrate joints; labium 

 impunctato, mcdianly canaliculate, anteriorly lightly cmarginate ; mandibles thick, not denticulate; scuto-episcutal 

 sutures somewhat obsolete; feet slender, rather short, not pilose, on each side 75; last pair (in female only?) 

 small, slender; sterna impressed with sterno-episternal sutures and a median sulcus. 



S. CEPiiAUCA, Wood, Journ. A. N. S., new series, 1863, vol. v, p. 49. 



The two dark lines on the dorsum are very obscure, and are evanescent anteriorly. The 

 cephalic segment is quite acute anteriorly. The legs are rather lighter in color than the 

 body, and are shorter than in the preceding species. Length, 21 inches. 



llab, California. 



S. PARVIOEPS. 



kS. saturate aurantiaca, polita; corporc antice valde sed postice leviter angustato; capite parvo, segmento cepha- 

 lico suborbicularo, impunctato; antennis modice longis, filiformibus, haud acuminatis, sparse pilosis, articulis non- 

 nihil obconicis; mandibulis crassis, sparse breve pilosis, obscure tridenticulatis, denticulo antico utrinque magno 

 conico acuto; labio lato, breve, impunctato, vix emarginato, sulco mediano obscure impresso; scutis sine suturis; 

 pedibus modice longis, graeilibus, pilis brevibus paucis, ct supcrficie ventrali sordide aurantiacis, utrinque 71, pari 

 postremo (in I'einina solum ?) parvo, gracile ; sternis suturis stcrno-episternalibus et sulco mediano imprcssis. 



