THE MYRIAl'ODA OF NORTH AMERICA. 



199 



exceptis cingulis anterioribus, fascia longitudinals subfuscente-flava, linea puncta subfuscente-atra divisa. Pedes 

 albido et fusco-variegati. 



Longitude 31 ad 4'"; latitudo &'".* 



T. exiguus, Brandt, Recueil, p. 85. 



" Gervais, Apteres, vol. iv, p. 177; Exp. Amer. du Sud (Castel.), Tabl. Myriap., p. 18. 



Species mihi ignota. 



I. OREOONENSIS. 



I. laste castaneus, albido-brunneo annulatus, et linea dorsale nigra et macular nigrpe seriebus lateralibus ornatus ; 

 antennis filifonuibus, longis, pilosis, subclavatis; capitis margine antico valde einarginato, denticulato; segmentis 

 44 — 45 ; scutorum lateribus canaliculatis ; mucrone parvo, robusto ; squama preanali triangulare. 



Bright chestnut, annulate with whitish brown, and ornamented with both a black dorsal line and a lateral series 

 of black dots; antenna; filiform, long, pilose, subclavate; anterior margin of the head strongly emarginate, den- 

 ticulate; segments 44 — 45; sides of the scuta canaliculate ; mucro small, robust ; preanal scale triangular. 



I. OREGONENSIS, Wood, Proc. Acad. Nat. Sci., 18(34, p. 11. 



The color of this elegant species is a bright chestnut, ornamented with rings of a very 

 light brown and a dorsal black line, as well as a black spot on the side of each scutum. 

 In some individuals there is on the anterior portion of the first scutum a black crescentic 

 blotch, and on the posterior a border of the same tint. The anterior aspect of the vertex 

 is long and narrow and deeply emarginate inferiorly, where it is denticulate and fringed 

 with two rows of distant hairs. The eyes are somewhat elliptical, and are connected by 

 an illy denned black band. The posterior portion of the body is not pubescent. The 

 outer piece of the male appendages (Fig. 31) is rather long, straight, and somewhat 

 clavate, and distally pilose. The inner process is large, and is formed of a plate so folded 

 longitudinally as to form a groove on the inner edge. From the base of the appendage 

 springs a slender process, which soon bifurcates ; the more slender of the divisions is the 

 longer. They both soon enter the groove, before spoken of, the 

 shorter and more robust being distal as to the other, and emerging 

 from the groove on the other side of the main process, whilst the 

 longer comes out on the same side as it enters. The female appen- 

 dages are composed of a broad, thin piece, from which arise a pair 

 of filiform, feet-like processes, besides two other very robust ones. 

 These last are sparsely pilose, and about as long as broad. They 



Fig. 31. 



* This is copied from Mr. Brandt's description in Recueil, &c. 



