THE MYRIAPODA OF NORTH AMERICA . 



183 



trenio (in mare ?) robusto, breve aonminato, articulis obconicis ; sternis suturis sterno-episternalibus et suloo mediano 

 lato impressis. 



£eHowish orange, polished j body anteriorly attenuate ; head small j oepbalio segment subtriangular, impunc- 

 tate; antenna) moderately long, filiform, not aouminate, sparsely' pilose, joints obconie; mandibles short, thick, 

 each with a rather large, conical denticule; labium short; anteriorly very emarginate, impunctate; seuta some- 

 times with a very obsolete median line; feet rather long, pilose, slender, cylindrical, on each side 47 ; last pair 

 (in male ?) robust, shortly acuminate, articles obconie ; sterna, impressed with a broad, median sulcus and sterno- 

 cpisternal sutures. 



Strioamia pulva, Sayer, Proo. A. N. S., vol. viii, p. 109. 



" " Wood, Journ. A. N. S., new scries, 1868, vol. v, p. 47. 



The color of this graceful little animal is an orange, approaching somewhat to fulvous. 

 The antenna; are very thread-like. Some of the specimens have the last pair of feet very 

 robust, with obconie joints. In others they are filiform and slender. The former are pro- 

 bably the males, the latter the females, I have, however, never been able to entirely 

 satisfy myself as to this, owing to the great difficulty of dissection. The median linear 

 depressions in the sterna are often dilated in their centre. 



Hub. Illinois, Pennsylvania, &c. 



8. BIDENS. 



S. aurantiaca, venuste polita; segmento eephalioo triangulare, antice truncate, sparse lato punctate, margine 

 antico postico nonnihil latiore; antennis brevibus, filifortnibus, articulis obconicis; labio sparse late punctate, sulco 

 obsolete, margine antico denticulis dnobus obsoletis obtusis annate; maudibulis intus minute unidcnticulalis ; 

 suturis souto-cpiscutalibus nullis; pedibus utrinquo 76, cylindricis, paris postromi coxis magnis, t'oveis signatis ; 

 sternis suturis sterno-episternalibus et sulco mediano impressis; squama preanali convexa. 



Orange, beautifully polished; cephalic segment triangular, anteriorly truncate, sparsely broadly punctate; the 

 anterior margin somewhat broader than the posterior; antenna) short, filiform, their joints obconical ; labium 

 sparsely broadly punctate, sulcus obsolete, anterior margin armed sometimes with two obtuse, obsolete denticules ; 

 mandibles within minutely unidenticulate; scuto-episcutal sutures absent; feet on each side 76, cylindrical; coxa) 

 of last pair large and marked with little pits; sterna impressed with stcrno opisternal sutures and a median sulcus ; 

 preanal scale convex. 



S. BIDENS, Wood, Journ. A. N. S., new series, 186», vol. v, p. 47. 



The coxa 1 of the last pair of feet art" very Large. Their inferior surface is convex, and 

 indented with from twenty to thirty small, round pits, irregularly arranged in rows. The 

 remainder of the feet arc, in our specimen, slender. I presume that the above character 

 is persistent in both sexes, but cannot be certain on this point. There is a single speci- 

 men in the Museum of the Academy, labelled as having been found near Philadelphia by 

 Joseph Leidy, M.I). I have never met with it whilst collecting. The length is about an 

 inch and a half. 



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