410 Mr. Newport on the Class Myriapoda, Order Chilopoda. 



This genus is perfectly distinct in the form of the head and the short an- 

 tennae from the true Scolopendrce, in the structure of the respiratory organs 

 from the Heterostomlnoe, and in the number of legs from Scolopendropsis ; 

 while it approaches Cryptops, but differs also from that genus in the distinct- 

 ness of the ocelli, and in the possession of labial teeth. 



1 . Theat. postica, aurantiaca, ocellis inconspicuis lateralibus, dentibus 8 minutis, segmento 

 postremo maximo elongate quadrato lateribus rotundato medio profunde sulcato mar- 

 gine posteriore transverso, pedibus postremis brevibus crassis rotundatis attenuatis; 

 articulo basali brevissimo conico. — Long. unc. ^. 



Crypt, postica. Say in Journ. Acad. Nat. Set. Phil. ii. p. 112. Id. (Euvr. Entom. i. p. 24. 

 Gerv, in Ann. Sci. Nat. Janv. 1837. p- 51. sp. 5. Lucas, Hist. Nat. Anim. Art. p. 54?. 

 sp. 5. Newp, I. c. p. 100. 



Hab. In Georgia Floridaque Orientali. {v. in Mus. Brit.) 



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

 gated and widely separated ; the teeth eight, 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 flat, 

 with a median longitudinal sulcus and scattered punctures, with the margin straight. 



This description is taken from a specimen in the Museum sent by Say to 

 Dr. Leach, and having the ticket of the latter attached to it. 



Subfamilia 2. Heterostomin^. 



Segmentum cephalicum basilareque truncata. Dentes maximi, elongati, Spiracula magna, 

 rotundata, baud valvxdaria, in paribus 10. 



The Hetei^ostomince are a distinct subfamily, characterized by the number 

 and structure of their external respiratory organs, and by the great size of the 

 labial teeth. They seem to comprise two genera, that differ from each other 

 in the size of the mandibular tooth, in the armature of the posterior legs, and 

 in the form of the respiratory orifices, which latter in Branchiostoma are pro- 

 jecting, and closed by a branchiform membrane thrown into folds, and remind- 

 ing us very strongly of the branchiform structure of the spiracles in some 

 water-beetles, as in Dyticus. In Heterostoma the spiracle is a perforated sieve- 

 like membrane. 



