ON THE CHILOPODA OF NORTH AMERICA. 



oo 



petite griffe; mais les euisses ne sont point renflc-es ni beaucoup plus grosses que celles des autres 

 pattes, et celles des pattes posterieures n'ont ni epines ni tubereules. Les machoires (ou les mandi- 

 bules des auteurs) sont brunes, comme le men ton ou la Ievre qui supporte les crochets des mandibules. 

 Cette lgvre n'est point bifide, mais arrondie a son extremitie ; elle n'a point de dents, mais seulemcnt 

 deux enfoncements lateraux. Les mandibules ou palpes ont leurs articles cylindriques et rougeiitres; 

 le dernier article est comme tronque et termine par une pointe ou onglet. Les antennes sont allongees 

 et quand' on les renverse en arriere, elles atteignment le millieu du einquieme segment ; leurs articles 

 courts, renfles, moniliformes, tres-reguliers, presque egaux, sont au nombre de 17. 



" Apporte de Jersey dans l'Amcrique du Nord par M. Milbert. Cette espece difi'ere de l'Hortensis par des 

 pattes beaucoup plus comtes et une tete plus arrondie." 



Species mihi ignota. 



C. Milberti, Gervais, Apt. iv. p. 592. 



Gen. 5. OPISTHEMEGA,* n. g. 



Segmenta podophora 21. Ocelli nulli. Labium plerumque dentatum. Scutum postremum maximum, quad- 

 ratum, alteris multo majore ; pedes postremi crassi, breves. Appendices anales laterales obtusaj. (Figs. 7, 8.) 



0. postica, n. sp. — 0. aurantiaca, capite polito punctata; segmento basali depressione triangulari mediana • 

 labio antice elongato, mandibulisque punctatis; laminis dentalibus subelongatis, margine antico fere 

 recto; denticulis 6, distinetis, acutis; antennis haud pubescentibus, 17 artieulatis; scutis sternisque 

 politis; scuto postremo subprofunde punctato, postice abrupte truncato, medio canaliculate, lateribus 

 rotundatis, marginibus lateralibus valde elevatis; pedibus postremis brevissimis, subprofunde punc- 

 tata, subcylindricis; articulis basali tibialique sine spinis, supra subcomplanatis, intus eomplanatis, 

 margine interiore superiore acuto, alteris rotundatis ; appendicibus analibus lateralibus angustis, dense 

 profunde punctatis, postice abrupte truncatis, sine spinis; squama preanali elongata, media vix canalici- 

 lata. 



From the triangular depression on the basilar segment two sutures diverge poste- 

 riorly. The scuto-episcutal sutures are very distinct, the 

 sterno-episternal wanting. The sterna are, however, pro- 

 vided with a mesian marking, the line of coalescence of the 

 two primitive sterna. The last pair of feet are rather 

 shorter than in the following species, more cylindrical and 

 smoother, especially on their inner surface. The basal joint 

 is rather shorter than the tibial, which is about twice as 

 long as the tarsal. Can this be the same species as Cryptops 

 postica, Say ? It agrees with Mr. Newport's description of 

 his Theatops postica, (C. postica, Say,) except as to the eyes and teeth. Is it possible 

 that Mr. Newport is mistaken as to the possession of eyes ? Say certainly did not 

 see them. 



Specimen hchnying to Smithsonian Institution. 

 287 | 1 | Goldsboro, N. C. | Wm. Stimpson, M. D. | | Une. U' | 



* Oiw?§i, postice, /uryxf. 





Fiff. 7. 



