ON THE CHILOPODA OF NORTH AMERICA. 4 f J 



S. laticeps, n. sp. — S. dilute aurantiaea; capite magno, impunctato; segmento cephalico lato, breve, 

 transverse-, quinqueangulato, segmentis basali subbasalique marginibus curvatis et angulis antieis pro- 

 longatis; antennis brevibus, crassis, cylindicis, antiee pubescentibus; labio breve, nonnihil convexo, 

 baud eanaliculato; mandibulis parvis, singula intus denticulo obtuso indistincto; pedibus subcompressis, 

 gracilibus, utrinque 81, pari postremo (in mare solum ?) nonnihil crasso, cylindrico, baud aeuminato 

 coxis magnis; sternis depressione lineari-ovata transversa et suturis sterno-episternalibus signatis ; 

 squama preanali valde canalieulata, postice valde emarginata, angulis posticis subaeutis. Long. unc. 3. 



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. Posteriorly there is an obsolete dark median dorsal line. 



Hob. — Texas. Museum of Comparative Zoology ; Geo. Stolley, Esq. 



S. CEPhalica, n. sp. — S. sordide dilute brunnea, superficie dorsali lineis pullis duabus, obsoletis ; cor- 

 pore modice robusto, antiee leviter sed postice illico valdeque angustato; capite magno; segmento 

 cephalico subtriangulare, impunctato, basali postice leviter dilatato ; antennis brevissimis, latis, depressis, 

 haud pilosis, articulis brevissimis, elongate quadratis ; labio impunctato, medio eanaliculato, antiee 

 leviter emarginato ; mandibulis crassis, haud denticulatis ; scutis suturis scuto-episcutalibus leviter im- 

 pressis ; pedibusg racilibus, modice brevibus, haud pilosis, utrinque 75, pari postremo (in femina solum ?) 

 parvo, gracile ; sternis suturis sterno-episternalibus et sulco mediano impressis. 



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. 



Specimen belonging to the. Smithsonian Institution. 

 129 | 1 | California. | ? | ? | Unc. 2i | 



S. parviceps, n. sp. — S. saturate aurantiaea, polita; corpore modice robusto, antiee valde sed postice 

 leviter angustato; capite parvo, segmento cephalico suborbiculare, impunctato; antennis modice longis, 

 filiformibus, haud acuminatis, sparse pilosis, articulis vix obconicis; mandibulis crassis, sparse breve 

 pilosis, obscure tridenticulatis, denticulo antico utrinque magno conico acuto; labio lato, breve impunc- 

 tato, antiee vix emarginato, sulco mediano obscure impresso; scutis sine suturis; pedibus modice longis, 

 gracilibus, pilis brevibus paucis, et superficie ventrali sordide aurantiacis, utrinque 71, pari pos- 

 tremo (in femina solum ?) parvo, gracile ; sternis suturis sterno-episternalibus et sulco mediano impresso. 



In the only specimen that we have seen the mandibles are perfect, with the excep- 

 tion that they lack the mandibular tooth, probably the result of an accident ; but it is 

 rather curious that both should be lost and the remainder of mandibles be uninjured. 

 The head appears to be destitute of punctations. 



Specimen belonging to the Smithsonian Institution. 

 311 | 1 | California. | ? | ? | Fnc. 2j | 



S. EPTiiEPTiCA, n. sp. — S. polita; corpore antiee valde sed postice modice angustato, supra saturate sed 

 subtus dilute aurantiaco; capite parvo; segmento cephalico suborbiculare, sparse minute albomaculato ; 



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