AOARI 525 



contrary to what is the case in the main form. Furtliermore, 

 the dorsal edge of the jaw is a perfectly even curve, wliile in 

 the main form it is slightly concave in front of the top of the 

 lower jaw. On the external side, close to the dorsal edge and 

 parallel with it, there is a narrow ridge, rising abruptly a little 

 in front of the middle and vanishing gradually towards a level 

 with the piliis dentaiùus. 



The ventral edge of the jaw has a deep semicircular incision 

 behind the terminal tooth and opposite the top of the lower jaw ; 

 behind this, the edge rises slowly backwards and has 7 small 

 teeth of equal size and equidistant, except the second and third 

 one, between which the distance is twice as great as between 

 the others, and where the pilus dentarius projects. Behind 

 the teeth there is another semicircular incision, behind which 

 the edge grows thin and perfectly straight. 



Palpi (fig. 6 a). Joint I with angularly projecting, narrow 

 ventral edge, at the top of which the posterior hair is inserted ; 

 exteriorly of this, and submarginally, there is a low semi- 

 spherical tubercle ; anterior hair stouter than posterior one, 

 slightly curved and hairy near the top ; joints II to V do not 

 exhibit anything remarkable, except that the chisel-shaped 

 bristles of joint III are bipectinate (fig. 6 h and c). 



Hypostoma (fig. 5). The position of the 3 anterior pairs of 

 hairs is shown in figure 5 ; of thèse, the latéral one is the shor- 

 test, the médian posterior one thelongest. Maxillary lobes 

 sharply pointed ; of the « basai joint », the detached cylindrical 

 portion of the hypostoma found in Pergamasus and Parasitus, 

 very distinct traces are noticeable. Thus it has its own distinct 

 musculature, and a Une, along which the cuticle is thicker, 

 runs in an even curve inwards from the inner edge of the lobes 

 to a level with the posterior médian hair. 



Maxillaryplates with fringes which in the dorsal quarter 

 are scarcely more than half as long as in the other part; the 

 smooth, finely pointed tips are short. 



Ventral side (fig. 7). 



