2<)<> 



THE MTRIAPODA OF NORTH AMERICA. 



reach about to the base of the filiform bodies, and have a slit-like orifice in their sum- 

 mit. 



Length of body. 24 inches. 



Ilil. Oregon. — Smithsonian Museum. 



I. CANADENSIS. 



I. brunneo-castaneus, linca nigra dorsali et puuetorum nigrorum seriebus lateralibus ornatus; segraentis 53; 

 mucrone niaximo, robusto, acuto, uncinato. 



Brownish chestnut, ornamented with a black dorsal line and lateral series of black dots; segments 53; mucro 

 very large, robust, acute, uncinate. 



I. CANADENSIS, Newport, Ann. and Mag. Nat. Hist., vol. xiii, p. 268. 



" Gervais, Apteres, vol iv, p. ITS; Exped. L'Amer. du Sud, Tab. Myr., p. 18. 



I have seen specimens of this species and written a detailed description, which was 

 destroyed at the Smithsonian fire. At present T am unable to obtain any 

 specimens, and therefore am forced to give only a specific diagnosis from 

 memory. Length, 2 inches. Fig. 32 is a drawing of the female organs. 



Hah. Northeastern United States, Canada. 



I. IMMACULATUS. 



I. saturate rubido-brunneus, baud maeulatus; antennis modiee longis, filif'orinibus, vix sub- 

 clavatis, pilosis ; capitis marginc antico modiee emarginato; segtuentis 48 — 51 ; scutis intra canaliculatis; mucrone 

 magno, uncinato, robusto, acuto. 



Deep reddish brown, not maculate; antennae rather long, filiform, scarcely subclavate, pilose; anterior marjriii 

 ol' the bead cmarginate ; segments 4K — 51; scuta inferior])' canaliculate; mucro large, uncinate, robust, acute. 



I. immaculatus, Wood, Proc. A. N. S , 18G4, p. 12. 



The color of all our specimens is a very dark reddish brown, unrelieved by any other tint. 

 On the vertex is a pair of coarse punctations, as in /. Canadensis. The lateral processes 

 of the first scutum in the female, although small, are somewhat canaliculate. 

 The mucro is certainly smaller than that of /. Canadensis. The male appen- 

 dages are composed of two parts. The outer of these consists of a somewhat 

 clavate and pilose process, with a curiously folded and contorted plate on its 

 inner side. The other portion is formed of a straight process, which has 

 several minute, spine-like bodies on its free extremity, and is proximally suddenly con- 

 tracted, and then expand somewhat, so as to give an appearance of emargination. from 

 the base of this springs another, almost filamentous process. 



