200 



THE MYRIAI'ODA OF NORTH AMFillCA. 



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

 mit. » 

 Length of body, 2i inches. 



Hub. Oregon. — Smithsonian Museum. 



I. CANADENSIS. 



I. brunnco-castaneus, linea nigra dorsali et punctorum trigrorum seriebus lateralibus ornatus; segmentis 5'S ; 

 mucrone maximo, robusto, acuto, uncinate 



Brownish chestnut, ornamented with a black dorsal line and lateral series of black dots; segments 58 J inuero 

 very large, robust, acute, uncinate. 



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



" Gcrvais, Aptcrcs, vol. iv, p. 1.78; Exped. L'Amer. du Sad, 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 I am unable to obtain any 

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

 lemory. Length, "A inches. Fig, ! 



Hub. Northeastern United States, Canada. 



Pig. 32. 



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



I. IMMAOUT.ATUS. 



1. saturate rubido-brunneus, haud maeulatus; antennis modice longis, filiformibus, vix sub- 

 clavatis, pilosis ; capitis margine antico modice emarginato; segmentis 48 — 51; scutis infra canaliculatis ; mucrone 

 magno, uncinato, robusto, acuto. 



Deep reddish brown, not maculate; antennas rather long, filiform, scarcely subolavate, pilose; anterior margin 

 of the head cniarginate; segments 48 — 51; scuta inferiorly canaliculate; macro large, uncinate, robust, acute. 



I. IMMACULATUS, Wood, Proc. A. N. S., 1804, p. 12. 



'I'Ik 1 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. 



Fig. 33. 



