THE MYRIAPODA OF NORTH AMERICA. 201 



The female (Fig. 33) 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 ; opposite to the latter face there is a broad, 

 irregular piece, which has its free extremity scolloped. 



Ihib. Catskill Mountains, New York.— Dr. H. C. Wood, Jr. 



L Pennsylvanicus. 



1. brunneus; antennis filiformibus, modicis, pilosis, vix subclavatis, articulis nigricantibus apicibus albidis; seg- 

 mentis 63; mucrone recto, nonnihil breve; corpore postremo piloso. 



Brown; antennae filiform, moderate, pilose, scarcely subclavate, their articles blackish with whitish apices; 

 segments 63 ; mucro straight, rather short ; body posteriorly pilose. 



I. Pennsylvanicus, Brandt, Recueil, p. 85. 



" Geroah (Suit a Buffon), Apteres, vol. iv, p. 179. 



The general color of this species is brown, but there is a series of lateral black dots 

 around which the color is often much lighter. There is a pair of punctations on the ver- 

 tex, which is traversed by a broad blackish band. The inferior portion of the head is 

 light brown, often mottled. The labium is moderately 

 emanrinate. Each scutum is furnished with a series 

 of rather distant puncta, from each of which proceeds a 

 more or less obsolete superficial groove. 



The male appendages (Tig. 34) are composed on each 

 side of two parts attached to the basal piece. The outer Wk ffchiii* 



of these is nearly straight, though somewhat rolled on 

 itself, and is distally enlarged and pilose. The inner part is formed chiefly of a thin, 

 straight piece, very much rolled and twisted. Distally it is expanded into a very thin, 

 transverse, diaphanous, alar process, with serrated edges. 



Ilab. Pennsylvania. 



I. CANALICULARS. 



I. brunneus, interdum creruleo tinctus; antennis filiformibus, pilosis, nonnihil elavatis; 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. 



vol. xiii. — 26 



