ACARI 539 



latéral teeth are small, thin and hyalin, whereas the médian 

 mucro is remarkably thick, and bent sharply downwards like 

 a hook at the top, so that on dorsal view the distal quarter is 

 not visible ; the médian edge of the latéral teeth lias sometimes 

 small teeth, 



The mandibles are very large and essentially of the shape 

 typical in E. Kraepelini Berl., E. Trouessarti Berl., E. magnns 

 and others, i. e. with uppe'r jaw considerably longer than the 

 lower one, and widened at the top, with no terminal tooth, 

 but one subterminal one instead. The lower jaw is nearly as 

 wide as the upper one; calcar mandibulihalf as wide as the 

 lower jaw, tapering distally, and fused with the latter in the 

 middle of its length, but otherwise free, except at the base ; 

 between the two there is consequently a comparatively wide, 

 elongated, oval fissure. The ventral edge of the calcar forms 

 an even curve with that of the jaw in front of the fusion. The 

 terminal tooth is powerful, but rather blunt and reaches, when 

 the chela is closed, to the middle of the upper jaw ; a little 

 in front of the middle there is another tooth, low, but with 

 a broad base, at the back of which the edge is straight, while 

 in front it is deeply excavated. 



The upper jaw exceeds the lower one by 2/7 of its own length ; 

 its dorsal edge is an unbroken, even curve, the usual dorsal 

 incision which is found closely behind the middle being very 

 small ; the ventral edge is mainly straight. There is no termi- 

 nal tooth, but a subterminal one, which is about twice as wide 

 at the base as it is long and perfectly perpendicular. Behind 

 this, the edge falls off perpendicularly, and then foUows a very 

 slightly concave edge with about 8 closely set, small teeth, 

 extending backward to the point where the dorsal edge of the 

 lower jaw crosses that of the upper one, with the chela clo- 

 sed ; then foUows a low, rectangular tooth, about twice as 

 wide at the base as it is long, and with 2 or 3 small teeth ; near 

 the anterior tooth of this edge there is a narrow incision where 

 the small pilus dentarius is inserted ; behind the tooth the 



