chamberlin: mtriopoda of the Australian region. 47 



similar in armature; hut the principal tooth of the femuroid is nearer the 

 distal end and the median nodule is not obvious. 



The last ventral plate is decidedly different, being .'interiorly as broad as 



long and much more strongly narrowed caudad. 



CoXOpleural pores fewer, arranged somewhat, in a circle, the more me-:d 

 Ones covered. 



Anal pores distinct. 



Anal Legs with proximal joints bearing numerous short setose points as in 

 nitmcticiis. 



Pairs of Legs, thirty-seven. 



Length, about 23 mm. 



Mesoleptodon, gen. nov. 



Clypeal area present but rather vaguely outlined in the genotype; with 

 distinct polygonal areas. Labrum tripartite, the pieces discrete and not 

 overlapping; lateral pieces pectinate; median piece small, triangular, the 

 free edge chitinous with teeth, so far as evident, very fine. First maxillae 

 with coxae mesally fused; outer branch biarticulate, the first joint with a long 

 lappet, the second joint long. Coxae of second maxillae not fused at middle; 

 palpus with joints lacking processes, claw smooth. Prehensors extending 

 beyond front margin of cephalic plate. Femuroid and claw armed. Pro- 

 sternum unarmed; without chitinous lines. Ventral pores in a transverse 

 band in front of caudal margin. Last ventral plate wide. Coxopleural pores 

 in form of two large pits on each side. Anal legs with claw. 



Genotype. — M . laetus, sp. nov. 



108. Mesoleptodon laetus, sp. nov. 



Type.— M. C. Z. 2,063. New Zealand: Taumarunni (W. M. 

 Wheeler). 



Color fulvoferruginous, uniform. 



Cephalic plate with sides evenly convex, widest at middle and about equally 

 narrowing toward both ends, the latter both wide and subtruncate ; one and a 

 half times longer than wide. Something of a furrow along position of frontal 

 suture but a true suture apparently not present. Antennae short; the last 

 article a little longer than the two preceding taken together. 



A prebasal plate present, but this separated from the cephalic only by 

 means of a furrow. Basal plate, so far as not covered by the first tergite, 

 3.2 times wider than long. 



Claws of prehensors when closed a little surpassing the distal end of the first 

 antennal article. 



Presternum without chitinous lines; unarmed; anterior margin as a whole 



