"Stenonia hispida. Body composed of seventeen double segments, distinctly divided on the dorsal mesial line. Body depressed, margins of segments quite prominent and curved forwards near the head, in the middle and posteriorly transverse or curved slightly backwards. Surface of each segment covered with five rows of distinct tubercles, arranged somewhat in quincuncial order. From the direction of the tubercles the lateral and posterior margins of each segment appear serrated. First cervical segment smaller than the next, rounded anteriorly, straight and narrower behind, and obliquely truncated on the sides. The posterior segment about equal to the next in length, is triangular, the apex armed with a stiff hair. Color pale red above, feet and ventral surface flesh colored.
Length 6". Under decayed logs."
Sager, Proc. Acad. Nat. Sci., 1856, vol. viii, p. 109.
I have never seen a specimen corresponding entirely with this description. Is it possible that Mr. Sager's species is either P. serratus, Say, or P. setiger, Wood?
P. Canadensis.
P. saturate brunneus; antennis pubescentibus, vix clavatis; scutis, singulo squamis 8 in serie duplici dispositis ornato, marginibus lateralibus obsolete serratis; appendicibus raasculis (Fig. 43) pilosis, spina terrainale modica, curvata.
Deep brown; antennæ pubescent, scarcely clavate; scuta each ornamented with 8 squama, arranged in a twofold series; lateral margins obsoletely serrate; male appendages hairy, their terminal spine moderate, curved.
P. Canadensis, Newport, Ann. and Mag. Nat. Hist, vol. xiii, p. 265; Catal. Brit. Mus., Myriap.
" Gervais Suit, a Buffon, Apteres, vol. iv, p. 106; Exp. L'Amer. du Sud (Castelneau), Myriap., p. 6.
"P. serratus, Say" H. Be Saussure, Mem. Soc. Nat. Hist. Geneva, vol. xv, p. 325.
| Fig. 43. | Fig.44. |
| |
The color of this species is a dark brown, verging somewhat towards a chestnut, with, in some individuals, still more of the red. The median furrow of the vertex is strongly pronounced. In other respects the head agrees with that of P. cerasinus. The antennæ are rather more pubescent than in that species. The scuta are ornamented with a double row of scales on their posterior surface. These rows are composed each of four broad rectangular scales. There is frequently on each side a raised convexity or umbo lying outside of these. The serratures in the lateral margins of the side plates are very minute and frequently entirely obsolete. The last scutum is triangular, with its obtuse apex decurvate. The male
