ON THE CHILOPODA OF NORTH AMERICA. 37 



•• The mandibles are short, thick, and have a distinct basal tooth ; the dental plates 

 are elongated and widely separated; the teeth 8, minute but distinct. The basal joint 

 of the posterior pair of legs much shorter than the second, which is twice as long as 

 the succeeding joints. The lateral anal appendages deeply punctured. Preanal scale 

 Hat, with a median longitudinal sulcus and scattered punctures, with the margin 

 straight." 



We have never seen a specimen of this species. 



Gen. 7. SCOLOPENDROPSIS, Brandt* 

 " Des yeux au nombre de 4 p:ii r. ~ ; '_' : paires de pieds; stigmatea peut-etre cribriformes ?" 

 Not yet found in N. America. 



Gen. 8. SCOLOPOCRYPTOPS, New 



li nulli, seguienta podophora 23, postremnm angustam ; segmentum cephalicum iinbricatum. Labium 



cdcutulum. Antennae 17 articulates. 



S 3EXSPINOSA, Newp. — S, saturate aurantiaca; pedibus flavis, subcomprcssis ; antennis flavis, intcrdum au- 

 rantiacis, pubesccntibus ; capite labio mandibulis scutis sternisque punotatis; segmento ccphalico sub- 

 ovato ; labii margine antico ferc recto ; scuto postremo angusto, longo ; pedibus postremis elongatis, 

 baud pilosis, articulo basali tibiali longiore, spina unica magna in superficie inferiore et altera minore 

 mediana in margine superiore interno et rare altera articulari minutissima ; appendicibus analibus late- 

 ralibua valde elongatis, profunde dense punctatis, singula spina apicali uniea, alteraque minutissima in 

 angulo superiore posteriore; squama preanali postice vix emarginata. 

 Cryptops texspinosus, Say, Journ. Acad. Nat. Soi. ii. p. 112, 1821, id (Lequien ed.) (Euvres Entom. i. 



p. lit ; Gervais, Ann. Sc. Nat. Janv. 1837, p. 51 ; Lucas, Hist. Nat. Anim. Art. p. 547 ; Ncwp., in Ann. 



and Mag. Nat. Hist. xiii. p. 100. 



S — '. Newp., Linn. Trans, six. p. 407; Gervais., Apt. iv. p. 297, et Tabl. Myriap. 



Amer. (Exp. Ameriq. du Sud, part, sept.) p. 36. 



In this species the superior spine of the lateral anal appendages is very minute and 

 occasionally present only on one side. The color varies from milk-white to a dark 

 reddish orange. The lighter shades are found in those individuals which have recently 

 shed their skins. The color given in our diagnosis may be considered as that which 

 characterizes the species, being the one at which it finally arrives. The inferior sur- 

 face of the posterior legs is marked with an elongate whitish blotch. The preanal 

 scale is rather short and much narrowed posteriorly. We have examined a number 

 of specimens, and have found the articular spine but in a few. We recently observed 

 an individual just completing the operation of shedding his skin. This was crowded 

 hack so as to cover only the last two or three segments, giving the animal a very 

 peculiar appearance. He soon, however, drew himself out of the old garment with 



*Recueil. p. 177, 1840. fLiuu. Trans, xix. pp. 275, 405. 



10 



