48 bulletin: museum of comparative zoology. 



concave. Claw armed at base with a dark, acute, conical tooth. Femuroid 

 bearing at distal end a much smaller and paler tooth. Other joints unarmed. 



Tergites bisulcate. In addition with two sulci toward each lateral border. 



Spiracles circular, small, the first no larger than the second. 



First legs much shorter and more slender than the second; the second legs 

 of intermediate length. 



Ventral pores numerous and distinct; in a transverse band in front of the 

 caudal margin of plate, this band in the posterior plates tending to be divided 

 at the middle line. 



Last ventral plate very wide, subti-apeziform, the caudal margin a littl6 

 convex. Coxopleurae each with two large pits adjacent to lateral edge of the 

 ventral plate, each pit more or less doubled. Anal legs in the male moder- 

 ately thickened; with numerous fine short hairs beneath; claw small. 



Pairs of legs, sixty-one. 



Length, 30 mm. 



Philogeonus, gen. nov. 



Clypeal area present. Outer branch of first maxillae biarticulate, with- 

 out lappets; coxae fused at middle, also without lappets. Coxae of second 

 maxillae forming a narrow isthmus at middle in which a separating suture 

 is still evident though weak; joints of palpus without processes, the claw 

 smooth. Middle piece of labrum small; teeth absent or indicated merely as 

 a few weak or obsolete crenulations. Prehensors extenditfg well beyond front 

 margin of head. Claw, femuroid, and the prosternum armed. Prosternum 

 without trace of chitinous hues. No ventral pores. Last ventral plate very 

 broad. Coxopleurae in genotype with three lobed pores on each side, these 

 wholly covered by last plate. Anal legs with claw. 



Genotype. — P. zelanicus, sp. nov. 



109. Philogeonus zelanicus, sp. nov. 



Type. — M. C. Z. 2,065. New Zealand: Lake Takopema, near 

 Auckland (W. M. Wheeler). 



Fulvous, with the head and prehensors pale chestnut. 



Antennae short; the last article about equalUng the two preceding taken 

 together. Cephalic plate broad, the width being three fourths as great as the 

 length; wide anteriorly and posteriorly, with the anterior margin convex, and 

 the caudal straight or shghtly incurved. No frontal suture. 



Prebasal plate exposed at the middle. Basal plate broad, 3.33 times wider 

 than long. 



Claws of prehensors when closed reaching or surpassing the distal end of 

 the first antennal article. 



