Mr. Newport on the Class Myriapoda, Order Chilopoda. 413 



Genus 10. Heterostoma*, Neiup. 



Antenna elongate, 20-articulata3. Segmenium cephalicum parvum, antice rotundatum ; ba- 

 silare latum, margine anteriore transverse. Denies maximi, lanceolati, acuti. Spiracula 

 magna, cribriformia, in paribus 10. Pedes postremi spinis validis armati. 



This is a very distinct genus, the characters of which are constant in all the 

 species. The mandibular tooth is small, and often entirely absent. The re- 

 spiratory organs are not closed by valves, but are formed, externally, each by 

 a large suboval, cribriform plate (Tab. XL. fig. 8 a, b.), placed vertically at 

 the sides of the second, fourth, sixth, seventh, ninth, and succeeding alternate 

 segments. The perforations in these plates communicate internally with a 

 large number of minute tracheal vessels, one to each perforation, and do not 

 together open at once into a large tracheal stem, like the valvular spiracles in 

 other Scolopendrldce. This peculiarity of structure of the breathing organs is 

 associated with a very marked form of head, large elongated antennae, acute 

 and powerful labial teeth, and strong posterior legs, of which the femora 

 have large acute spines. These characters seem to indicate very predaceous 

 habits. 



Most of the species hitherto obtained are from the western coast of Africa 

 and from Australia, and there is also one of the most marked species of the 

 genus from Ceylon, and one from the South Sea Islands. 



This genus includes the majority of the species described as Longidentata f 

 in my former account of specimens in the collection at the British Museum. 



1. Heter. trigonopoda, nigro-viridis, antennis viridibus apice ferrugineis, dentibus 8, mandi- 

 bulis labioque virescenti-ferrugineis, pedibus flavescenti-viridibus, segmento postremo 

 pedibus appendicibusque analibus lateralibus ferrugineis, pedum postremorum articulo 

 basali spinis in margine interno 5 magnis totidemque biseriatis in superficie inferiore. 

 — Long. unc. 4. 



Scolopendra trigonopoda. Leach, Zool. Misc. iii. p. 36. Ge?T. in Ann. Sci. Nat. I. c. p. 50. 

 sp. 7- Lucas, Hist. Nat. Anim. Art, p. 545. sp, 7- Newp. I. c. p. 99. 



? Scolopendra Eydouxiana, Gerv. in Voy. de la Favorite, v. p. 180. t. 53. 



Hab. In Africa, Congo et Senegal, {v. in Mus. Brit.) 



* "Erepos, different ; (jTOfxtt, mouth, spiracle. f Annals and Mag. Nat. Hist., Feb. 1844, p. ^9. 



