224 



TilE MYRIAPODA OF NORTH AMERICA. 



Fig. 53. 



Fig. 54. 



portion of its lateral lamina a bright yellow or orange spot, and a blotch, of the same tint 



on the median portion of its posterior border. Occasionally 

 this is so prolonged as almost to give the idea of a con- 

 tinuous transverse band. The first scutum has two central 

 markings, situated the one on its anterior, and the other on 

 its posterior border. These arc so shaped and joined to- 

 gether as to suggest the idea of an hour-glass. The anal 

 scutum is triangular and somewhat elongate. It is yellow, 

 but has a dark spot on each side, and its truncate apex is 

 tipped witli brown. The head is chestnut-brown. Its vertex is deeply canaliculate, and 

 its inferior lip distinctly emarginate and fringed with hairs. The antenna? are light-brown, 

 slender, and not at all clavate. The; feet are light-yellow, with their distal portion some- 

 what pilose and occasionally tipped with brown. The male genital appendages (Fig. 53) 

 are very large and robust. Their terminal spine is simple, long, slender, and irregularly bent 

 upon itself. They are also furnished with a small, nearly straight, spinulc, placed proxi- 

 mally as to the terminal. The female appendages (Fig. 54) are short, thick, and bulbous. 

 On one side of each there is air opening, with two projecting plates separated from one 

 another by a linear orifice. I have seen a male and female, which were collected by Mr. 

 E. 1). Cope in Susquehanna County, Pennsylvania. They are about two inches long. 



P. CRASSICTJTIS. 



P. maxinius, robustus ; soutis enormiter subrude punctatis ; appendieibus masculis (Fig. 55), singula spinis 

 quatuor, duobus magnis, parvis duobus armata. 



Very large, robust; scuta irregularly, subrudely punctate; male appendages each armed with four spines; two 

 large, two small. 



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



The color of all the specimens is light-testaceous, with, in many, a dark dorsal line. It 

 is very possible that the alcohol, in which they have been long preserved, may have 

 destroyed the original color. The animal is very large and robust, and 

 has its outer armor and side plates very heavy. The head on its upper 

 surface has a distinct median furrow, and on its lower a broadly linear, 

 oblique depression on each side. The inferior margin is rather broadly 

 and deeply emarginate. The lateral lamina? are rather short. The female 

 appendages (Fig. 40) are a pair of small, pyramidal, pilose bodies, whose 

 apices are split into three or four very minute mameloid processes. The male organs are 



Fig. 55. 



