582 IVAR TRÀGARDH 



Maxillary palpus(fig. 99). The thin ventral blade o£ joint 

 I attains a width of one quarter the entire joint ; its edge 

 is convex, and it has one small bristle, distally. For the other 

 détails I refer to the figure. 



Hypostoma (fig. 100). Owing to the extrême minuteness 

 of thèse parts, it is difficult to gain a thorough insight into 

 their exact structure. The maxillary lobes are thin, hyalin, 

 and very narrow and rounded ; at the top they are attached 

 to the exterior side of the maxillary plates, near their base. 

 The latter are bifid at the top, with the lobes narrow and roun- 

 ded at the top ; edges without fringes. 



The epistoma is narrow, tongue-shaped, with even edge. 



Female. 



OuDEMANs' statement of the hypostoma andpalpi of the 

 female being like those of the maie is not stricly correct. 

 The ventral blade of joint I is twice as wide in the female, but 

 shorter, and its edge is anteriorly serrated. The maxillary 

 lobes and plates are considerably shorter, but their shape 

 seems to be the same as in the maie. 



The m audible s (figs. 101 a and h). The lower jaw is longer 

 than in the maie (5 : 4), with very short terminal tooth, and 

 even edge. The upper jaw is curved like a liook at the top, the 

 liook being slender and pointed. The distal third of the jaw 

 at the back of the hook is flattened dorso-ventrally, with a 

 ventral grove to receive the top of the lower jaw. The exterior 

 edge at tliis part of the jaw wddens, and has two small hooks, 

 directed sHghtly backwards, the posterior one of thèse being 

 only half as long as the anterior. At the curve, dorsally, the 

 small pilus dentarius is inserted (1). 



(1) OuDEMAN's has mistakeD the upper jaw for the lower oae. He says (1903, p. 132). « Man- 

 dibles chelate, the luovable flnger with a hook distally, which is Outside provided with two smaller 

 hooks, and a little knot ». Va a matter of faci, this statement holds good as to the u p p e r j a w 

 In order to dispel ail doabts as to the correctness of my statement, I refer to ligure 101 b, where 

 the maiulible is delineated in situ on a spécimen regarded from the ventral side. I may add that 

 the n little knot » mentioned by. O. is the pilus dentarius. 



