40 bulletin: iiubeum 01 comparative io3logy. 



left more exposed at the tides; tin- basal plate ■ mora than right bimei wider 

 than the length of tin- exposed area a1 the middle. 

 The olawi of the prehenaorial feel when closed extend much beyond the 



front margin of the head, in fact, the distal end of the I'-muroid lying well 



beyond the anterior end of the cephalic plate. Claw- stout, curved, the 

 inner edge orenulate, armed .it base with s stout, long, black tooth. Second 

 and third articles unarmed. Pemuroid armed within a lit tit- caudad of distal 



end with B stout, bluntly rounded tooth. 

 Presternum armed in front with two moderately long conical teeth. 



First legs much shorter and more slender than the second. 



Spiracles all circular, the first much larger than the second. 



Last ventral plate narrow, decidedly longer than wide; sides Mraight, 

 moderately converging caudad; caudal margin slightly convex. 



Coxopleural pores small, moderately numerous but not dense, some con- 

 cealed under the edge of the ventral plate, a few also occurring above at 

 proximal end. 



Anal pores very small. 



Anal legs clothed ectally and above with numerous short setose hairs. 

 Claw small. 



Pairs of legs, forty-nine or fifty-one. 



Length, 20 mm. 



90. Zelanion librius, sp. nov. 



Type.— M. C. Z. 2,060. Paratype — M. C. Z. 2,061. New 

 Zealand: Lyell Bay (W. M. Wheeler). 



Of ferruginous cast, the head and prehensors deeper. 



Cephalic plate shaped much as in Mecistocephalus; narrowed gradually 

 from a little in front of the middle caudad. On caudal portion two well- 

 marked longitudinal furrows formed by coarse puncta and lying closer to- 

 gether than their own width. Plate I six times wider than long. Antennae 

 moderate; last article shorter than the two preceding taken together. 



Easily distinguished from the other species in having the exposed portion 

 of the basal plate much longer, this in the type being 3.3 times wider than 

 long. 



Claws of prehensors when closed reaching to the end of the second antennal 

 article. Tooth of claw slender and acute; that of femuroid very stout but 

 short, distally broadly truncate. 



Prosternal teeth rather close together, their inner edges only slightly di- 

 vergent. 



First legs shorter and more slender than the second. 



Spiracles all circular, the first greatly exceeding the second in size. 



Anterior ventral plates with a deep median longitudinal furrow. Last 



