THE MYRIAPODA OF NORTH AMERICA. 



171 



as any of the others, deeply punctate, and without a sulcus or any traces of the sutures. 

 The last pair of legs are dark in color, short and very rohust ; their basilar joint is often 

 furnished with one or two small spines, besides the terminal, on either the inferior or 

 superior internal margin. They present the peculiar crossing of the nails found in the 

 other species. The other legs arc somewhat compressed. Length, 2i inches. 



llab. South Illinois, West Pennsylvania. Smithsonian Collection. 



QfSS. 6. Till*] A TOPS, Newp* 



"Ocelli distincti. Antennae breves, subulatse, 17 — articulate, Segmentum ccphalicum truncatum subimbri- 

 catuin; margine labiali dentioulato. Pedum postremorum articulus magnus, obconicus, abbreviatus. Pedum paria 

 21. Appendices analcs laterales obtusaa." 



Eyes distinct. Antennae short, subulate, 17 articulate. Segments cephalic, truncate, subimbricate ; labial 

 margin denticulate. Joint of the last feet large, obeonical, abbreviated. Pairs of feet 21. Lateral anal appen- 

 dages obtuse. 



T. POSTIOA. 



" T. aurantiaea, occllis inconspicuis Iateralibus, dentibus 8 minutis, segmonto postremo maximo clongato quad- 

 rate latcribus rotundato medio profunde sulcato margine posteriore transverse, pedibus postrcmis brevibus erassis 

 rotundatis attenuatis ; articulo basali brevissimo. Long. unc. 8-10." 



Orange, ocelli lateral not conspicuous; tooth 8 minute; last segment very large, elongate, quadrate, with its 

 sides rounded medianly; profoundly sulcate, with its posterior margin transverse; last feet short, thick, rounded 

 attenuate; basal joint very short. Length, 8-10 inches. 



Cbtpt. postioa, Say, Journ. A. N. 8., Philada., ii, p. 112; (Euvr. Entom. i, p. 24; Gervais, Ann. Soi. Nat. 

 Janv., 1837, p. 51, sp. 5; Apt. iv, p. 294. 

 " Lucas, Hist. Nat. Anim. Artie, p. 517, sp. 5. 



" Newport, Ann. Mag. Nat. Hist., xiii, p. 110. 



Tiieatops postioa, Newport, Linn, Trans., xix, p. 410; Catal. British Mus. (Myriap.), p. 01. 

 " Wood, Journ. A. N. S., new series, vol. v, I860, p. 37. 



" llab. In Georgia, Floridaque Orientali." 



" The mandibles arc short, thick, and have a distinct basal tooth ; the dental plates are 

 elongated and widely separated ; the teeth 8, minute but distinct. The basal joint of the 

 posterior pair of legs much shorter than the second, which is twice as long as the succeed- 

 ing joints. The lateral anal appendages deeply punctured. Preanal scale fiat, with a 

 median longitudinal sulcus and scattered punctures, with the margin straight." 



I have never seen a specimen of this species. 



* Linn. Trans., xix, p. 410. 



