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THE MYRIAPODA OF NORTH AMERICA. 



S. MAOUT.ATIOKI'S. 



S. sordide aarantiaca, pofita; corpore robusto, snbsemioylindrico, antioe modice atteimato; capito modioe parvo, 

 obscure saturate rubro, minute alboinaculato, in latcribus sparse piloso; antennis longis, levitcr pubcscentibus, haud 

 acuminatis; niandibulis erassis, obscure quadridentatis, pilis paucis; denticulo antico utrinque magno, conico; labio 

 impunctato, antice vix emarginato, medio canaliculate; pedibus modice longis, graoilibus, subcompressis, utrinque 

 77, et superficie ventrali sordide flavis; scutis kcvibus sine suturis; sternis laevibus, suturis sterno-episternalibns 

 valdo impressis et plerumqoe postice depressionum subovatarum transversarum pari ; pedibus postrcmis ("stylis 

 analibus") (in mare solum ?) robustissirais, supra subcoinplanatis, subtus convexis, acuminatis. 



Dirty orange, polished; body robust, subsemicylindrical, anteriorly moderately attenuate; head rather small, 

 obscurely deep red, minutely spotted with white, sparsely pilose on the sides; ' antenna) long, lightly pubescent, 

 not acuminate; mandibles thick, obscurely quadridentate, with a few hairs; anterior denticule on each side large, 

 conical ; labium impunctate, anteriorly scarcely emarginate, medianly canaliculate ; feet rather long, slender, sub- 

 compressed, on each side 77, together with the ventral surface dirty yellow; scuta smooth, without sutures; sterna 

 smooth, strongly impressed with the sterno-episternal sutures, and generally with a pair of irregularly ovate, trans- 

 verse depressions; last pair of feet ("anal styles") (in male only?) very robust, above subcomplanate, below 

 convex, acuminate. 



S. MACOLATIOEPS, Wood, Journ. A. N. S., new series, vol. v, 1868, p. 48. 



The cephalic segment is slightly narrowed anteriorly, and the upper surface of the whole 

 head is marked with very small whitish dots. The anterior and posterior extremities of 

 the body are perhaps a little darker in color than the intervening portion. The inferior 

 aspect of the head is of the same color as the superior, contrasting with the under surface 

 of the body. Near the posterior border of each sterna there is a pair of subequal 

 oval transverse depressions. The legs are almost destitute of hair, having occasionally, 

 however, a few very short ones. Length, 2i incites. 



Eab. Upper Colorado. H. B. Mollhauscn. — Smithsonian Collection. 



S. LATICEL'S. 



S. dilute aurantiaca; capita magno, impunctato; segmento cephalico lato, breve, transverso, quinquoangulato, 

 segmentis basali subbasalique marginibus curvatis et angulis anticis prolongate ; antennis brevibus, crassis, cylin- 

 drieis, antice pubcscentibus; labio breve, nonnihil convoxo, haud canaliculato; niandibulis parvis, singula mtus 

 denticulo obtuso indistincto; pedibus subcompressis, graoilibus, utrinque 81, pari postrcmo (in mare solum ?)'non- 

 nihil crasso, cylindrico, haud acuminate, coxis magnis; sternis depressionc lincari-ovata transversa et suturis sterno- 

 epistcrnalibus signatis; squama preanali valde canaliculata, postice valde cmarginata, angulis postieis subacutis. 



Light orange; head large, impunctato; cephalic segment broad, short, transverse, quinquoangulato ; basal and 

 subbasal segments with their margins curved and anterior angles prolonged; antenna; short, thick, cylindrical, 

 anteriorly pubescent; labium short, somewhat convex, not canaliculate; mandibles small, each with an indistinct 

 obtuse tooth on inner surface; feet subcompressed, slender, 81 on each side; last pair (in male alone?) somewhat 

 thickened, cylindrical, not acuminate, with large coxa); sterna marked with a transverse linear-ovate depression 



