THE MYRIAPODA OF NORTH AMERICA. 189 



S. epilf.ptica, Wood, Journ. A. N. S., new series, 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. 



Hub. Oregon. Neighborhood of I'ugct's Sound ; Dr. Kennerly. — Smithsonian Collection. 

 S. CII10NOPI1ILA. 



S. aurantiaca, gracilis, parva, venuste polita; segraento cephalico fere subquadrato, postice medio canaliculato ; 

 antennis pilosis, haud acuminatis, articulis (ultimo excepto) obconicis; mandibulis dente modico in margine interno 

 armatis ; suturis scuto-episcutalibus iuterdum obsoletis sed plerumque distinctis; pedibus pilosis, utrinque 43; 

 pari postremo (in femina solum?) gracile, parvo; sternis vel canaliculatis vel depressione subcirculare notatis 

 et suturis sterno-episternalibus valde impressis. 



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

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

 moderate denticule 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 either canaliculate or 

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



S. chionophila, Wood, Journ. A. N. S., new series, vol. v, 1863, p. 50. 



The distal joint of the filiform antennae 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, i inch. 



Bab. Fort Simpson, Red River of the North ; R. Kennicott. — Smithsonian Collection. 



Ord. II. DIPLOPODA. 



Corporis segmenta, singulum 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 coxa?, femora, tibial, tarsal, and metatarsal joints. The coxic of the last pair 

 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 



