NATURAL SCIENCES OP PHILADELPHIA. 11 



the outer edge. It presents on one aspect an unbroken, tolerably regular 

 surface, but on the other is proximally abbreviated. Through the opening 

 thus afforded projects a pair of subcircular, somewhat globose plates, fitting 

 together much as the shells of a bivalve. 



Length, 2 inches. 



Hab. Illinois. Smithsonian Institution. R. Kennicott. 



In the same collection we have seen a male lulus very closely resembling 

 the former, but differing so much in its genital appendages, that it probably 

 represents a distinct species. The outer of the two parts, forming each geni- 

 tal appendages, consists of a thin, flat, crooked, very irregular process, and 

 a shorter, robust, pilose and strongly clavate one. The former, proximally, 

 is quite broad, and narrows from the base, but distally is but at a right 

 angle to itself, and is rapidly contracted, so as to terminate in a nearly cylin- 

 drical crooked point. The main process of the inner portion is somewhat 

 cylindrical proximally, but is distally expanded. At first bent at a right 

 angle to itself, it next has the swan-neck curve, and is then bent at an acute 

 angle to itself to be straight the remainder of its length. At this augle there 

 is a minute sharp spine. Shielded, as it were, by this process, there is 

 another, very slender and acute. 



I. PILOSISCDTA. 



T. castaneo-brunneus maculae nigrae (interdum obsoletae) seriebus laterali- 

 bus ornatus ; antennis longe pubescentibus ; capitis margine antico modice 

 emarginato, denticulato ; segmentis 58; mucrone parvissimo ; scutis pilosis 

 singulo punctae sejuncta? serie impresso. 



The color of this species is a chestnut brown, sometimes mottled with 

 light brown. The anterior aspect is beautifully but irregularly areolated 

 with the latter color. The antennae are moderately long, and have their dark 

 joints tipped with white. Their is a pair of coarse punctations on the vertex. 

 Each scutum has a series of distinct punctations extending entirely around 

 it ; from these dots proceed little channels, obsolete on the fore-part of the 

 body, but gradually becoming strongly pronounced. The anterior portion of 

 the body is sparsely, but tli^ posterior densely, pilose. The anal scales are 

 very rough. We have never seen a male. Neither can we give a detailed 

 account of the female genital appendages, but one portion of them consists of 

 a pair of short, subcylindrical, rather robust and distally clavate processes. 



Hub. Susquehanna Co., .Pennsylvania. E. D. Cope, Esq. 



I. OREGON ENSIS. 



I. laete castaneus, albido-brunneo annulatus, etlinea dorsale nigra et maculae 

 nigrae seriebus lateralibus ornatus ; antennis filiformibus, longis, pilosis, sub- 

 clavatis ; capitis margine antico valde emarginato, denticulato ; segmentis 

 44 45 : scutorum lateribus canaliculars ; mucrone parvo, robusto ; squama 

 preanali triangulare. 



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 por- 

 tion 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 nar- 

 row and deeply emarginate interiorly, where it is denticulate and fringed 

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

 are connected by an illy defined black band. The posterior portion of the 

 body is not pubescent. The outer piece of the male genital appendages 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 genital appendage springs 



[Jan. 



