562 IVAR TRÂGARDH 



Mandibles (fig. 70) witli narrow chela, of even width in the 

 proximal two thirds, and twice as long as it is wide. The lower 

 jaw with two teeth of equal size, the terminal one, and one in 

 the distal quarter. Behind the latter there is a small incision, 

 at the back of which the edge is perfectly straight and even. 

 Upper jaw with small terminal tooth, close behind which there 

 is a larger subterminal tooth. On a level between the two lower 

 teeth there is another perpendicular, narrow and pointed tooth, 

 at the front of which pilus dentariusis inserted. Opposite 

 the posterior lower tooth another slightly lower one, behind 

 which the edge is perfectly straight ; pilus basalis very small. 



Hypostoma (fig.72). Of the four hypostomatic hairs, which 

 are ail very long and setiform, the anterior one, which is the 

 longest, is placed near the top of the hyp. projection; maxil- 

 lary lobes long and slender. 



Ventral side (fig. 73). At the anterior margin of thester- 

 niti-metasternal shield there is a narrow transverse shield, 

 demarcated by a fine line. This shield, may possibly be homo- 

 loguons wit the jugular shields fused together. As a rule, 

 however, even when jugular shields are présent, the first pair 

 of sternal hairs is inserted at the anterior end of the sternal 

 shield, not on the jugular shields, and, as there is one pair of 

 hairs on the ante-sternal shield, this, presumably, signifies that 

 it is not équivalent to jugular shields, but only a modification 

 of the anterior edgeof the sternal shield. Sternal shield fused 

 with the endopodal and metapodal shields, extending 

 backwards with deeply excavated hind margin to a level with 

 the middleof coxae IV. Metapodal shields triangular, with 

 straight médian, slightly convex, latéral side ; longer than they 

 are wide (at the back of coxse IV), and extending backw^ards 

 a little beyond the middle of the geniti-ventral shield. They 

 are fused with the peritrematic shields into one shield 

 which extends forwards on to a level with the anterior side of 

 coxse I, where it coalesces with the dorsal shield. They bear 

 only one pair of hairs near the posterior end. 



