ON THE CI1ILOPODA ()F NORTH AMERICA. 



The antenna? are sometimes green or blue, and in all of our specimens pubescent on 

 their distal portion. Their joints are short and almost globose. The scuto-episcutal 

 sutures are well marked, but not so strongly as the sterno-episternal. The legs are 

 slightly compressed. The basal joint has all of its margins well defined, so that it is 

 scarcely subcylindrical, but rather subparallelopipedal. The spines are arranged in 

 rows on elevated bases, so as to give the appearance of being on an interrupted crest or 

 raised line. The apices of the lateral anal appendages are much prolonged, slightly 

 curved upwards, impunctate and almost diaphanous. This species is separated from its 

 southern representative, by the more rectangular and smaller cephalic segment and 

 the larger basilar, by the more moniliform and fewer jointed antenna?, as well as by 

 the differences in the structure of the lateral teeth and posterior pair of feet. We 

 were at first disposed to consider our specimen as representing a species distinct from 

 M. Gervais', but further examination has convinced us that that naturalist had a 

 specimen with reproduced hind feet; yet we think it worth while to append his 

 description, so that the correctness or incorrectness of our opinion may be more easily 

 shown.* Besides the Smithsonian specimens, we have an individual from Massa- 

 chusetts belonging to the collection of the Museum of Comparative Zoology. 



Tahiti showing variations in specific characters. 







Spines on inner surface 



Spines on lower surface 



Spines on termi 



Spines on late- 



Number of 



Labial teeth. 



of basal articulation of 



of basal articulation of 



nal angular pro- 



ral anal appen- 



specimen. 





posterior pair of legs. 



posterior pair of legs. 



cess. 



dages. 





r 3 



3 



10 



2 



3 



2G7 



J A reprod. lam. 

 1 4 



5 



5 



8 



8 



2 

 1 



3 



o 





I 4 



4 



8 



2 



n 





r 4 



4 



5 



7 



•2 



4 





? 



V 



V 



5 



268 



1 4 



5 



7 



6 



4 





I 4 



s 



9 



6 



4 



Specimens belonging to the Smithsonian Institution. 



267 

 268 



Illinois. I R. Kennieott. 



Uno. 2 



*"S. inequidentu (S. IN.EQUIDENS.) — '' Tete subcordiforrne un pen elargie ; doubles stries dorsales paralleled 

 continues en dessus, assez peu marquees; bord posterieur du dernier segment triangulaire obtus; stries infe- 

 rieurs faiblement divergentes ; plaques des segments subarrondies a leur bord posterieur; plaque preanale 

 quadrilatere etroite a bord posterieur plus etroit que l'anterieur, droit; angles subarrondies: pieces laterales 

 terminees en epine multifide trcs-finement ponctuees; antennes longues nues; sallies dentifcres finemenl 

 ponctuees, a trois dent inegalcs, l'interne large, a bord libre rectiligne, la mitoyenne peu distincte, subarrondie, 

 l'externe separee par un espace plus grand; pieds de derriere assez longs, forts, subarrondis. epiueux en dis- 

 sous et a la face interne : G ,'pincs environs en dessous ; et a pen pres 14 an bord interne, la dernfere multifide, 

 a sept petites pointes inegalea en couronne. Couleur ferrugineuse un peu nuancee de verdatrej antennes 

 pales ; tete, segment forcipulaire et partie posterieur plus ferrugineuse. Longeur de corps, 0.190 : plus grande 

 largeur, 0.022. Antennes, 0.035 ; pieds de derriere, 0.035.'' 



" Des Etats Unis, a New-York, par M. Milbert, (Museum do Paris, 1824.") 



S. in<equidcns, Gervais, Tableau des Myriapods A.mericains, (Exp. dans L'Amerique du Sud, sept, part.) p. 30 



7 



