12 PROCEEDINGS OF THE ACADEMY OF 



a slender process, which soon bifurcates ; the more slender of the division 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 side 

 it enters. The female genital appendages are composed of a broad, thin 

 piece, from which arises 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 reach about to the base of the filiform bodies, and have a slit- 

 like orifice in their summit. 



Length of body, two and a half inches. 



Hab. Oregon. Smithsonian Museum. 



I. IMMACULATUS. 



I. saturate rubido-brunneus, baud maculatus ; antennis modice longis, fili- 

 formibus, vix subclavtis, pilosis ; capitis margine antico modice emarginato ; 

 segmentis 48 51 : scutis infra canaliculars ; mucrone modico, uucinato, ro- 

 busto, acuto. 



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 /. Cana- 

 densis. The lateral processes of the first scutum in the female, although 

 small, are somewhat canaliculate. The mucro is certainly smaller than that 

 oil. Canadensis. The male genital appendages are composed of two part?. 

 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 contracted, and then expand 

 somewhat, so as to give an appearance of emargination. From the base of 

 this springs another, almost filamentous process. 



The female genital appendages consist of two bodies conjoined at their 

 bases, and blunt at their free extremity. When viewed from one aspect, 

 they appear cylindrical, but from the other, flattened or even concave ; oppo- 

 site to the latter face there is a broad, irregular piece, which has its free extre- 

 mity scolloped. 



Hab. Catskill Mountains, N. Y. Dr. H. C. Wood, Jr. 



I. CANALICULARS. 



I. brunneus, interdum creruleo tinctus ; antennis filiform ibus, pilosis, non- 

 nihil clavatis ; segmentis 51 ; scutis supra et infra arete canaliculatis, singulo 

 pilorum longorum distantium serie unica instructo ; mucrone longo, recto ; 

 squamis analibus longe pilosis ; squama preanali triangula, acuminata. 



The color of this species is a dark brown, with sometimes a bluish tint, and 

 very gradually mottled with light brown. The triangular eyes are connected 

 by an obscure black band. The labial margin is broadly emargiuate, and is 

 furnished with two or three denticules, as well as a double row of distant 

 rigid hairs. The joints of the antennae are tipped with white. The first scu- 

 tum is, in the female, slightly prolonged laterally, where it is rounded off; on 

 its anterior surface there is a dark somewhat crescentic blotch. The anterior 

 of the two subscuta, forming each scutum, is closely and deeply canaliculate 

 through its whole circumference ; it is broader than the posterior, and very 

 slightly elevated, so as to give the body somewhat of a moniliform appear- 

 ance. The ring of hairs surrounding each scutum is frequently imperfect ; it 

 may be from the handling of the specimen. The posterior subscutum is 

 smooth above, and distantly and shallowly canaliculate below. The posteri- 

 or portion of the body is very pilose. I have never seen a male. 



Length, one and a half inches. 



Hab. Chester Co., Pennsylvania. Dr. H. C. Wood, Jr. 



[Jan. 



