THE MYRIAPODA OF NORTH AMERICA. 223 



P. BIFIDUS. 



P. rubro castaneus, segmentis et antice et postice late fulvo-marginatis, laminis lateralibus dilute fulvis ; scuto 

 anale triangulare, apice truncato et decurvato ; appendicibus masculis, elongatis, pilosis ; spina terminale gracil- 

 linia, proxima cylindracea, ultima bifida et nonnihil abrupte curvata, spinulo basale gracillimo parvo armata. 



Reddish-chestnut; segments both anteriorly and posteriorly broadly margined with yellowish; lateral laminae 

 dilute yellow; anal scutum triangular, its apex truncate and decurvate; male appendages elongate, pilose; their 

 terminal spine very slender, proximally cylindrical, distally bifid, and somewhat abruptly curved, armed with a small, 

 very slender basal spine. 



P. bifidus, Wood, Proc. Acad. Nat. Sci., 1864, p. 7. 



All of my specimens have been preserved for a length of time in alcohol, so that the 

 description of color is not as accurate as it should be. The anterior rig. 52. 



aspect of the head is much lighter than the vertex, which is medianly 

 strongly canaliculate. The antenna? are dilute fulvous, rather longer 

 than in P. Virginiensis, and distally, sparsely and shortly pilose. The 

 spinules on the distal ends of the first and second joints of the long 

 and slender feet are robust, but arc often obsolete anteriorly. The 

 terminal scutum has several puncta? closely resembling pores. The 

 preanal scale is triangular ; it has two little elevations surmounted by 

 a punctum. The male appendages (Fig. 52) are elongate.- Their terminal spine is very 

 slender and cylindrical in its proximal portion ; distally it is bifid and strongly curved. 

 It is ornamented with a very slender curved basal spinule. 



Hub. Georgia. Museum of Comp. Zoology. — Dr. Le Conte. Texas. Smithsonian Collection. — G. Wurde- 



P. TRIMACULATUS. 



P. saturate rubro-brunneus; scutis postice fulvo trimaculatis, corrugatis ; antennis ultimis pilosis; appendicibus 

 masculis maxiiuis, crassis, ultimis obtuse rotundatis, spina terminali gracillima, enormiter convoluta. (Fig. 53.) 



Deep reddish-brown; scuta posteriorly trimaoulate with yellow, corrugate; antennae distally pilose; male 

 appendages very large, thick, distally obtusely rounded ; terminal spine slender, irregularly convolute. 



P. trimaculatus, Wood, Proc. Acad. Nat. Sci., 1864, p. 6. 

 The color of this species is a dark reddish-brown. Each scutum has on the posterior 



