208 A. e. OUDEMANS, NOTES ON ACARI. 



the anterior edge. Between this pair and the nephridial ope- 

 nino-s two pairs of minute hairs. A considerable distance behind 

 the nephridial openings a pair of ditto. Quite laterally behind 

 the transverse line that goes through the top of the excavation 

 a very thin hair. In the narrowest part of the horns an external 

 short pin, directed outward, and an internal very thin and stiff 

 hair directed inward. Just behind the external pin a small croo- 

 ked hair almost pressed against the side of the horn. In the 

 outer posterior angle of the horn a long hair as long as the 

 metasoraa ; in the inner posterior angle a short pin, directed 

 inward. Between these two angles and planted apparently in 

 the posterior membrane a thin hair somewhat longer than 

 the width of the excavation. 



Ventral side (Fig. 13). E pirn er a I long, free, 

 proximally (posteriorly) a little bent outward, distally leng- 

 thened on the sides of the neck. E p i m e r a II like epimera 

 I, anteriorly with inner rounded enlargement, and lengthened 

 along the edges of the prosoraa between trochanteres 1 and II. 

 Behind trochanteres II a curve chitinous epimera-like bar 

 (ventral lengthening of the dorsal da-k prosoroatic margin). 

 Epimera III short, distallv slightly bifurcate. Epimera IV long, 

 slightly s-like, halfway with short external epimerite ; distally 

 with external ditto of which the first part has a circular 

 appendix. Shields; no coxal plates. From a level which 

 goes through the anal suckers, to a level which goes through 

 the narrowest parts of the horns the posterior dorsal shield 

 is sufflexed, apparently to form a clasper during the copu- 

 lation. Outside of epimera III the triangular lateral shields. 

 No e p i a n d r i u m. Lips of genital opening a little chitinized, 

 simulating an epiandrium (compare with Pt. indiens, fig. 34). 

 Penis short, rodlike. Before the genital apparatus two pairs 

 of minute genital suckers. Anus terminal, flanked by 

 the well developed anal suckers which are distant from 

 each other two diameters of themselves, and from the excava- 



