40 ON THE CIIILOPODA OF NORTH AMERICA. 



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

 pedibus postremis valde elongatis, gracillimis, asperis, singulo spinis dnobus S. sexspinosae illis siniilli- 

 bus sed multo elongatioribus, articulo tibiali basali fere sequali ; appendicibus analibus lateralibus valde 

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

 posteriore ; squama preanali antiee ct postice angustata, postice truncata sed baud euiarginata. 



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. Scbott. | | Unc. 2| | 



Gen. 9. NEWPORTIA, Gervais.* 



"P edes posteriores longissitni artieulis 14, cbaracteres eseteri ut in genere prtecedente." 



Not yet found in N. America. 



Subfamilia II. IIETEROSTOMINiE, Newp.t 



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



Gen. 10. RHYSIDA.J 



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

 membramt branchiformi corrugata intus vestita. Pedes postremes graciles, spinis minutis, articulari 

 plerumque obsoletfi." 

 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.|| 



"Antennae elongatse, 20 artieulatae. Segmcntum cepbalicum parvum, antiee rotundatum; basilare latum, 

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

 paribus 10. Pedes postremi spinis validis armati." 



Not as yet found in N. America. 



Gen. 12. EUCORYBAS, Gerstacker. 



"Antennae 19 articulata;. Caput primo thoracis annulo reeeptum. Pedum paria 21, posterioribus lon- 

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

 in laminas foliaceas perversis."§ 



Not yet found in N. America. 



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



% puras, corrugatis. Iu allusion to the structure of the mouth. 



|| Linn. Trans, vol. xix. p. 413. ? Gerstacker, Stettin Entom. Zcit. 1854, p. 310. 



