A. O. OUDEMANS, NOTES 0\ ACABI. 207 



and IV narrow rudiments of coxal plates. Hairs: a pair of 

 minute hairs outside of epimera I ; a pair of ditto inside of 

 epiraera III ; 3 pairs of ditto inside of epimera IV ; one pair 

 of ditto flanking the anus ; one pair of ditto near the posterior 

 oblique edges of the abdomen. Outside of epimera III the 

 lateral hairs, of which one is as long as epimera I, and the 

 accessory one as long as epimera III. Between epimera IV, 

 near to the median line, two pairs of minute genital suckers. 



M a n d i b u 1 a, maxillae and legs normal. 



Male (Fig. 12). Length 320—323 (j^ without mandibles 

 and posterior lobes ; 440— 456 jW with these organs. Colour 

 dark brown. Shape like that of Pt. gambettile and totani, 

 but the posterior deep excavation resembles that of Pi. calidrilis. 

 1^ e X t u r e smooth in the shields, wrinkled in the weak parts. 



Dorsal side (Fig. 1 2). The margin of the pro- 

 soma is dark, well chitinized. The space within this margin 

 is occupyed by the anterior dorsal shield, except behind 

 trochanteres II. Behind trochanteres II and the anterior dorsal 

 shield a rather wide band of unprotected skin. Posterior dorsal 

 shield and lateral shields occupying the remainder of the dor- 

 sum, except two rather wide bands of unprotected skin between 

 these three shields. Posterior excavation nearly cir- 

 cular, only a little convex opposite to the anal suckers (Fig. 

 14). Hyalin membrane narrowest in the top, widest in the 

 sides of the excavation, posteriorly rounded and here touching 

 the threelobed postcornal pieces. The internal one of these 

 lobes is wide, somewhat square with rounded angles; the two 

 other ones are triangular slips. Nephridial openings 

 near trochanteres IV. Hairs. On the anterior shield a pair 

 of hairs as long as the width of the shield near trochanteres 

 II ; inside of these hairs a pair of minute cues. On the lateral 

 shields a pair of minute hairs near the anterior edge and the 

 lateral hair (which has become dorsal) a little before trochan- 

 teres III. On the posterior shield a pair of minute hairs near 



