THE MYRIAPODA OP NORTH AMERICA. 221 



Si bgenus FOISTTARIA. 



Dorsum convexum. Laminae laterales magnae, depress*. 



Dorsum convex. Lateral laminae large, depressed. 



P. VIRGINIENSIS. 



P. castaneus; laminis lateralibus fulvis; appendicibus masculis maximis, spinulo gracile basale armato ; spina 

 terininale breve, robusta, eurvata, bifida. (Fig- 49.) 



Chestnut, with yellowish lateral laminae; male appendages large, armed with a slender basal spinule, their ter- 

 minal spine short, robust, curved, bifid. 



Iulus Virginiensis, Drury, Ins. Exotica. 



Polyd. Virginiensis, Pal. Beavois. Lis. & Afr. et Amer. Apteres, pi. iv, fig. 5. 



" " Say, Journ. Acad. Nat. Sci., 1st series, vol. ii. 



" " Gervais, Ann. Sc. Nat., 2d serie, t. vii, p. 43 ; et Exped. Suit, a Buffon, Apteres, vol. 



iv, p. 106; et Exped. L'Ameriq. du Sud (Uastelneau), Myriapoda, p. 6. 



" " Newport, Catal. Brit. Mus. 



Fontaria Virginiensis, J. E. Gray, Griffith's Animal Kingdom Insecta, pi. 135, fig. 1. 

 Vix Polyd. Virginiensis, //. De Saussure, Memoir Soc. Hist. Nat. Geneva, tome xv, 'p. 320. 



The color of this species is a dark reddish chestnut, with the lateral lamina? of bright 

 yellow, sometimes verging towards orange. The under surface of the body is yellowish. 

 The scuta are wrinkled as in P. corrusratus, but not to so great an extent, at least 



° ° _ Fig. 49. 



in the individuals that have fallen under my observation. The head is of the same 

 color as the body ; its vertex furrow is strongly pronounced ; its anterior margin 

 yellowish and broadly emarginate. The antenna? are lightish chestnut, and dis- 

 tally very pilose, almost pubescent. The posterior scutum is triangular, with its 

 apex truncate ; its color is that of the lateral lamina?. The latter have their 

 anterior angles somewhat rounded, their posterior moderately acute, rarely pro- 

 longed except in the last four or five. The male appendages are large and robust ; from 

 each of the pair springs a small falciform spine, lying so close as not to be easily per- 

 ceived. The terminal spine is set at an angle to the main process. Its base is very hairy, 

 and has springing from it a long slender spinule. Distally the spine is bifid and curiously 

 curved. [The figure represents only the terminal spine.] I have no specimens to enable 

 me to describe the female appendages. 



In some individuals there exists a well-pronounced black, median, dorsal line. In others 

 the pattern of coloration approximates that of P. corrugatus ; but I have never seen a 

 well-pronounced margination of the scuta. There may be some doubt as to whether this 

 is the species intended to be indicated in the original description of P. Virginiensis, which 



