10 ON THE CHILOPODA OF NORTH AMERICA. 



are probably the remains of the sutures between the plates of which it was composed 

 during embryonic life. The articular spines are rather strong. The smallest specimen 

 has only twelve pairs of eyes. It affords us great pleasure to dedicate this species to 

 Mr. Xantus, through whose " exhaustive collections " the rich fauna, of what has been 

 a veritable "terra incognita," is being rapidly developed. Owing to mutilation, it is 

 impossible to say with certainty that our specimen from Oregon belongs to this species; 

 but from the extensive geographical range of the species east of the Rocky Mountains, 

 we should infer that it did. 



Specimens belonging to Smithsonian Institution. 



346 



280 



Ft. Tejon, Cal 

 Oregon. 



J. Xautus do Vesey. 

 ? 



Lin. S— 10. 



A doubtful spec, owing to 

 mutilation. 



B. BiruNCTATUS, n. sp. — B. brunneus, segmcnto cephah'co polito margine postico elevato; labio et sparse 

 profunde et dense minute punctata; ocellis utrinque 18; antenuis punetatis, sparse pilosis, laminis 

 dentalibus brevibus, latis, denticulis nigris aeutis 18 armatis, margine subrotundato; scutis alternis 

 majoribus capite simillime punetatis, politia, vix asperatis, postice emarginatis. scutis alternis minoribus 

 postiee margine recto et angulis haud productis; sternis politis; pedibus punetatis, subrobustis. 



The head is of moderate size, with the posterior margin slightly emarginate and 

 not elevated in the centre. The larger scuta are not deeply emarginate, but somewhat 

 roughened, with a suture on each side ; the anterior portion of the latter is longitudinal, 

 but the posterior transverse. The transverse suture, running from one set of eyes to 

 the other, is not as well marked as in Xanti. Posterior scuta rather deeply emargi- 

 nate behind. Preanal sterna not as circular as in Xanti, but with the same markings. 



Specimen belonging to Smithsonian Institution. 

 67 | 1 | West of Rocky Mountains. | Gov. I. I. Stevens. | Dr. Geo. Suckley, U. S. A. | Lin. 10. | 



Gen. 3. HENICOPS, Neivp* 



" Caput latum, depressum, oecllo magno utiinque unico. Labium lamelliforme." 



Not as yet found in North America. 



Fam. III. SCOLOPENDRELLID.E, Newp.f 



" Corpus pedesque breves, appeudicibus styliformibus. Segmenta ina?qualia ; scutis dersalibus imbricatis. 



Antenna? elongatre, articulis ultra 16." 



This family is not known to be represented in America, and we have never seen 

 a member of it. The diagnosis above is that of Newport. 



Gen. 1. SCOLOPENDRELLA, Gervais.|| 



" Antennas moniliformes, pilosse. Corpus e segmentis 14. Pedum paria 12. Caput depressum segmento 



basilari brevissimo.'' 



*Linn. Trans, xix. p. 372. f Linn. Trans, six. ]>. 275. 



I Although this family, ami various genera described elsewhere, are hardly entitled to a place in this paper, 

 we have thought it best to give their diagnoses, in order that in case representatives of them shall be found in 

 this country, the observer may, without difficulty, recognize to which genus his specimen belongs. 



|| Comptes Eendus de l'Acad. des Sciences. 



