ON THE CHILOPODA OF NORTH AMERICA. 51 



S. lineata. — S. griseo-brunnea; oapite magno ; segtnentis cephalico et basali appendicibusque saturate 

 rubris ; segmento anali obscure flavo (interJum " subcordato"); corpore antice leviter sed postice 

 niodice angustato; superficie dorsali lateribusque singula lineis duabus obscuris subnigris interruptis 

 approxirnatis; segmento cephalico lato, breve, quinqueangulato, postice abrupte truncato (aut "satu- 

 rate rubro"); antennis brevissirnis et crassissimis, latis, depressis, haud cylindricis, sensim acuminatis, 

 sparse brevissitue pilosis; labio convexo, saturate rubro, antice vix emarginato, sulco mediano obscure 

 iinpresso; mandibulis haud denticulatis; scutis longitudinaliter trisulcatis, et interdum depressione 

 obscura utrinque impressis, suturis scuto-episcutalibus nullis, marginibus lateralibus elevatis ; pedibus 

 brevibus, gracilibus, flavis, utrinque 77, pari postremo (in fernina solum '!) parvo et gracile; sternis 

 suturis steruo-episternalibus et sulco obscuro mediano impressis. 

 G. Uneatus, Newp., Linn. Trans, xix. p. 436; Catal. British Mus. Myriap. p. 89; Gervais, Apteres iv. 



p. 321. 



The subbasilar segment is of the same color as the body. The two median dark 

 lines anteriorly are scarcely separable and less interrupted than other portions. One 

 of the lateral lines is situated on the edge of the scuta, and the other just above the 

 spiracles ; they are composed of a series of dots. The three median sulci of the scuta 

 are closely approximate. Our specimen differs from Mr. Newport's diagnosis both in 

 the color of the anal segment, the shape of the cephalic subsegment, and the markings 

 of the labium, but otherwise agrees very well. 



356 | 1 | Choco, New Grenada. | A. Schott. | ] Unc. 2 j 



S. tropica, n. sp. — S. dilute brunnea, capite antennisque aurantiacis, segmento anali obscure flavo, 

 corpore antice modice scd postice illico valdeque angustato ; superficie dorsali lateribusque singula 

 lineis duabus approxirnatis, interruptis, subnigris ; segmento cephalico subtriangulare,'breve, modice 

 angusto ; antennis filiformibus, modice brevibus, nee acuminatis nee pilosis; labio convexo, antice haud 

 emarginato, sulco mediano multo; mandibulis haud denticulatis; scutis longitudinaliter trisulcatis, 

 et plerumque depressione utrinque impressis; suturis scuto-episcutalibus nullis; pedibus modice 

 brevibus, gracilibus, obscure flavis, utrinque 77, pari postremo (in femina solum?) parvo, gracile; 

 sternis dense punctatis, suturis sterno-episternalibus et depressione centrali suborbiculare impressis. 



The subbasilar segment agrees with the rest of the head in color. The dark lines 

 are almost exactly like those of the preceding species. The median sulci are perhaps 

 not quite so sharply cut. The head is proportionally considerably smaller than that 

 of E. Uneatus. The antennas are also essentially different from those of that species. 

 We have a specimen which is of a very light yellow and with traces of the dark lines, 

 even the head being of a very light shade. We have no hesitation in referring it to 

 this form, believing it to be an individual that has just changed its skin or shell; the 

 skins of all species probably being white, or nearly so. when just assumed, and gra- 

 dually darkening and gaining their peculiarities with age. 



358 | 2 | Nicaragua. | Capt. Rodgers. | B. Wrighl | Unc. 2j | 



