lete, 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; antennæ 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. pilosiscuta.
I. castaneo-brunneus maculæ nigræ (interdum obsoletæ) seriebus lateralibus ornatus; antennis longe pubescentibus; capitis margine antico modice eraarginato, denticulato; segnientis 58; mucrone parvissimo; scutis pilosis, singulo punctorum disjunctorum serie impresso.
Chestnut brown, ornamented with a lateral series of black dots (sometimes obsolete); antennæ pubescent; anterior 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 antennæ 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 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 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 distally clavate processes.
Hab. Susquehanna County, Pennsylvania.—E. D. Cope, Esq.
I. exiguus.
Corporis segmenta cum anali 31 ad 33. Pedum paria 51 ad 55. Oculi subrotundi. Antennæ pilosæ, 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 notato, abdomen attingens. Segmenta reliqua dorsalia parte posteriore subtumida, convexa, quare corpus submoniliforme, striis subremotiusculis, grossiusculis, in dorso subobsoletis, in lateribus distinctis impressa. Penultimum cingulum satis insigne, in posterioris marginis medio breviter mucronatum, mucronis apice pallide brunneo, anum vix superante. Valvulæ anales laterales pilosæ. Squama analis inferior triangularis postice mucronata. Caput nigrum, antice fuscescens, margine labiali flavicante-albido. Labium inferius fuscescens, margine anteriore flavicante-albido. Corpus totum fusco-nigrum, nitidum, abdomine pallidiore. In dorso medio,
