40 ON THE CIIILOPODA OF NORTH AMERICA. 



punctatis, singula tuborculo magno ; scutis rare punctatis, posterioribus marginibus lateralibus elevatis ; 

 pedibus postreima valde elongatis, gracillimis, asperis, singulo spinis duobus S. sexspinosae illis siinilli- 

 bus sod multo elongatioribus, articulo tibiali basali fere acquali ; appendicibus analibus lateralibus valde 

 elongatis, rude punctatis, singula spina apicali uniea longa alteraque minutissima in angulo superiore 

 posteriore ; squama preanali antiee et postice angustata, postice truncata sed haud emarginata. 



The color of the body approximates to a dark bronze. Both the dorsum and the 

 belly are very highly polished. The scuto-episcutal sutures apparent, the sterno- 

 episternal absent. The posterior pair of legs are more than half an inch in length, 

 very slender and have their distal portion tinged with green. The sterna are im- 

 punctate. 

 355 | 1 [ Choco, N. Grenada. [ A. Sehott. | | Unc. 2| | 



Gen. 9. NEWPORTIA, Gervais* 



"P edes posteriores longissimi articulis 14, characteres cseteri ut in genere prcecedente." 



Not yet found in N. America. 



Subfamilia II. HETEROSTOMIN.E, Newp.t 



Spiracula magna, circularia, haud valvularia, in paribus 10. 



Gen. 10. RHYSIDA.J 



" Antennae pedesque elongati. Dentes triangulares acuti, mandibularis maximus. Spiracula circularia, 

 membrana brancbiformi corrugata intus vestita. Pedes postremes graciles, spinis minutis, articulari 

 plerumque obsoleta." 

 Branchiostoma, Newp., Linn. Trans, xix. p. 411. 



As the name given by Mr. Newport is preoccupied, having been used by Costa for 

 a genus of fishes, we would suggest the one above. This genus has not as yet been 

 found in N. America. 



Gen. 11. HETEROSTOMA, Newp.JI 



"Antennas elongates, 20 articulatae. Segmcntum cephalieum parvurn, antiee rotundatum; basilare latum, 

 margine anteriore transverse Dentes maximi, lanceolati, acuti. Spiracula magna cribriforniia, in 

 paribus 10. Pedes postremi spinis validis armati." 



Not as yet found in N. America. 



Gen. 12. EUCORYBAS, Gerstacker. 



"Antennae 19 articulatae. Caput primo thoracis annulo receptum. Pedum paria 21, posterioribus lon- 

 gioribus ; pedes ultimi paris articulo primo sub-cylindrico haud dentato, altero intus excavato, ceteris 

 in laminas foliaceas perversis."§ 



Not yet found in N. America. 



* Apt. iv. p. 298. t Linn. Trans, vol. xix. p. 410. 



X ?u<roi, corrugatis. In allusion to the structure of the mouth. 



|| Linn. Trans, vol. xix. p. 413. \ Gerstacker, Stettin Entom. Zeit. 1854, p. 310. 



