f 



ACARI 547 



most gênera are chisel-shaped, are setiform, but blunt at the 

 top. 



Hypostoma (fig. 42). Of the 4 pairs of hypostomatic hairs 

 the posterior ones are modified into very powerful, stout, 

 but short bristles, pointing backwards, and of a shape uniform 

 with those of the coxse ; the 3 anterior pairs, on the other 

 hand, ar small and setiform. Maxillary lobes thin, membra- 

 naceous as in the gen. Laelajjs s. |str., rounded at the top; 

 maxillary plates with a slight latéral incision at the mid- 

 dle, in front of which it gradually narrows' with straight 

 and perfectly smooth edge ; at the back of the constriction a 

 narrow blade of even width throughout, and slightly longer 

 than wide, projecting obliquely outwards and forwards ; at 

 the truncated top of it there is a fringe of almost even 

 width, and as long as the blade. 



Ventral side (fig. 43). 



Sternal shield projecting backwards on to a level with the 

 hind margin of coxae IV, with straight anterior edge, and the 

 corners eut ofï obliquely ; between coxse II the sides are slightly 

 concave ; between coxae II and III they project a little, tlience 

 they gradually narrow towards the obtusely rounded posterior 

 end, where the shield is almost half as wide as between coxae II 

 and III. 



Of the 4 pairs of bristles one pair is inserted near the anterior 

 margin, the other 3 submarginally, at the sides and on a level 

 with the middle of coxae II to IV respectively. The former 

 pair is of ordinary size, the latter of extraordinary, stout and 

 poniard-shaped. 



No endopodal shields developed ; nor any peritrematic 

 shields. Stigmatafarback laterally, on a line drawn between 

 coxae III and IV; peritremata running forward beyond coxae I. 



Anal shield pyriform, top backwards, half as long as the 

 distance between the sternal shield and the margin of the body ; 

 length to greatest width in the anterior third as 3 : 2, with the 

 usual 3 hairs. On the unproteced part of the belly there are 



