THE MYRIAI'ODA OF NORTH AMERICA. 



189 



v 



8. EPJLEPTICA, Wood, Jouvti. A. N. S., now scries, vol. v, 1863, p. 49. 



This is much the largest Geophilid as yet found within our limits. The greatest breadth 

 of the scuta is about two lines. The white; dots on its head are very minute, resembling 

 punctations. Length, 5i inches. 



Hab. Oregon. Neighborhood of Pugct's Sound ; Dr. Kenncrly. — Smithsonian Collection. 



8. omoNOPinriA. 



S. aurantiaoa, gracilis, parva, venuste polita; segmento cephalico fore subquadrato, postiee medio oanaliculato ; 

 antennis pilosis, baud acuuiinatis, articulis (ultimo execpto) obconicis; mandibulis dente modico in margine interno 

 armatisj suturis scuto-cpiscutalibus iuterdum obsolctis sed plerumque distinctis; pedibus pilosis, utrinque 43; 

 pari postremo (in I'eniina solum?) gracile, parvo ; stcrnis vel canaliculars vel depressione subcirculare notatis 

 et suturis sterno-epistornalibus valde impressis. 



Orange, slender, small, beautifully polished; cephalic segment almost subquadrato, posteriorly medianly canali- 

 culate ; antennas pilose, not acuminate ; their joints (the distal one excepted) obconie ; mandibles armed with a 

 moderate dentioulo upon their internal margin ; scuto-episcutal sutures sometimes obsolete, but generally dis- 

 tinct; feet pilose, on each side 43; last pair (in female alone?) slender, small ; sterna cither canaliculate or 

 marked with a subcircular depression, and impressed with the sterno-cpisternal sutures. 



S. ciiionoitiila, Wood, Journ. A. N. S., new scries, vol. v, 1868, p. 50. 



The distal joint of the filiform antenna; is large and cylindrical, causing them to appear 

 somewhat clavate. This species is a very interesting one, from the fact of its inhabiting 

 a region so near the Arctic circle. Its diminutiveness shows that the Myriapoda form no 

 exception to the general decrease in size observable among the lower animals as we leave 

 the Equator. Length,- 1 inch. 



Hab. Port Simpson, lied llivcr of the North; II. Kennicott. — Smithsonian Collection. 



Ord. II. DIPLOl'ODA. 



Corporis segmenta, singulurn pedum paribus duobus instructum. 

 Segments of the body numerous; each furnished with two pairs of feet. 



The body among the Diplopoda is more or less cylindrical, not flat and parallelopipedal, 

 as in the Chilopoda. Neither of the subsegments composing a segment is atrophied, nor 

 are their appendages ; consequently each segment is provided with two pairs of legs. 

 These have coxae, femora, tibial, tarsal, and metatarsal joints. The coxa; of the last pah- 

 are never hypertrophied, as in the first order. The organs of special sense are not well 

 developed. The eyes are; frequently altogether absent ; when they do exist, they are gene- 

 rally numerous, scarcely at all elevated above the surface;, and collected in patches near 



