198 THE MYRIAPODA OF NORTH AMERICA. 



letc, a transverse series of longitudinal, abbreviated, obsolete, impressed lines; and beneath 

 the stigmata with impressed, more distinct ones, ultimate segment mucronate, spiracles 

 not prominent ; eyes rather large, conspicuous, black ; labrum yellowish white ; antennae 

 brownish." 



" A common species inhabiting under stones, and in humid situations ; a variety occurs 

 with a very distinct, acute, longitudinal, dorsal line, and variegated head." 



I. I-ILOSISCUTA. 



I. castaneo-brunneus macula; nigra; (interdum obsolete) seriebus lateralibus ornatus ; antennis longe pubescen- 

 tibus ; capitis margine antico modice emarginato, denticulate ; seginentis 58 ; uiucrone parvissimo ; scutis pilosis, 

 singulo punctoruni disjunctorum serie impresso. 



Chestnut brown, ornamented with a lateral series of black dots (sometimes obsolete) ; antenna; pubescent ; ante- 

 rior margin of the head moderately emarginate, denticulate ; segments 58 ; mucro very small ; scuta pilose, each 

 impressed with a series of distant dots. 



I. pilosiscuta, Wood, Proc. Acad. Nat. Sci., 1864, p. 11. 



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 antenna; 

 are moderately long, and have their dark joints tipped with white. There is a pair of 

 coarse punctations on the vertex. Each scutum has a series of distinct punctations ex- 

 tending 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 the posterior densely, pilose. The anal scales are Very rough. I 

 have never seen a male, neither can I give a detailed account of the female appendages, 

 but one portion of them consists of a pair of short, subcylindrical, rather robust and dis- 

 tally clavate processes. 



Hub. Susquehanna County, Pennsylvania. — E. 1). Cope, Esq. 

 I. EX1GUUS. 



Corporis segmenta cum anali 31 ad:):;. Pedum paria 51 ad 55. Oculi subrotundi. Antenna; pilosse, sub- 

 breves, articulis apicalibus approximatis, subincrassatis, quoad colorem fusco nigricantes, articulorum apicibus 

 albidis. Cinguli primi supra epunctati processus lateralis trigonus, modice acutus, subelongatus, apice incurvato, 

 striis aliquot impressis notatOj abdomen attingens. Segmenta reliqua dorsalia parte posteriore subtumida, convexa, 

 quare corpus Bubmoniliforme, striis subremotiusculis, grossiusculis, in dorso subobsoletis, in lateribus distinctis 

 iinpicssa. IViiultimuin cinguluni satis insigne, in posterioris marginis medio breviter mucronatum, mucronis 

 apice pallide brunneo, anum vix superante. Valvulae anales laterales pilosse. Squama analis infi rior triangularis 



postice i ronata. Capul nigrum, antice fuscescens, margine labial i fiavicante-albido. Labium iuferius fuscescens, 



margine anteriore fiavicante-albido Corpus tot u in fusco-nigrum, nitidum, nbdomine pallidiore. In dorso medio, 



