130 Prof. J.Wood-Mason on a new Species of Phasm'idx. 



with their inner surfaces exposed, there is distinctly to be 

 seen the row of small teeth along their upper margins, with 

 the large laniarj in front and the other three laniaries behind ; 

 these are placed at about equal distances from each other. 



On not one of these mandibles do I find the slightest indi- 

 cation of a suture which might divide the bones bearing the 

 laniary teeth. 



If, as tlie author of the above-named paper states, our 

 prsemaxilla is the alveolar border or dentary piece of the 

 mandible detached from that bone, how does it happen that in 

 all the large series of mandibles of Rhizodopsts in my collec- 

 tion the alveolar border or dentary piece with teeth, which is 

 supposed to represent our prtemaxilla, is not wanting in any 

 specimen, whilst the pra^maxilla, which is much more common 

 in our coal-field than either the maxilla or the mandible, is 

 absent from a good many of the more perfect specimens of 

 RMzodopsis (which is, from the lax connexion of this bone 

 with the cranium, what might have been expected) ? 



Of the largest specimen the maxillte measure 1*4 inch in 

 length; their upper margins are injured ; the lower, bearing 

 the row of small teeth, are intact. 



The prtemaxilla}, articulating with the front of the maxillaj, 

 unite together on the median line, forming the fore part of 

 the mouth below the snout ; each bone is 1'6 inch in length 

 and 0"2 inch in height next tlie symphysis, gradually dimi- 

 nishing backwards. 



That we have here the real prtemaxilla is beyond a doubt. 



XIX. — Description of a new Species of Phasmidge^^'om India. 

 By Prof. J. Wood-Mason, Deputy-Superintendent, Indian 

 Museum, Calcutta. 



Necroscia menaka^ n. sp. 



? . Body elongate, stoutish, of tolerably uniform widtli 

 throughout. Head large, oblong, parallel-sided; vertex 

 divided by three notches into four tubercles. Pronotum 

 shorter and narrower than the head, flat, with a few minute 

 granules. Mesothorax slightly tapering from the insertion of 

 the legs forwards, granulate above and below and on the sides ; 

 its dorsal arc longitudinally carinate, granulate along the top 

 of the ridge and at the edges. Abdomen tapering slightly 

 from the base to the emarginate apex, Avhich carries a longi- 

 tudinally carinate semioval plate ; its terminal segments, dorsal 



