6 ARKIV FÖR ZOOLOGI. BAND (). N:0 2, 



which projects forwards to a level with tlie top of the jaw. 

 The lower jaw is broader and shorter than the upper one 

 and on lateral view triangulär. 



Near the base of the lower jaw, on the inner (median) 

 side, there is inserted a narrow, slightlv /S-curved appendage, 

 which is of even width throughout and obtuse at the top; 

 it projects forwards to a level with the top of the upper jaw. 

 Along the median side of the mandibles, in the proxi- 

 mal half there is an ovoid cushion-shaped portion detached, 

 the function of which seems highly mysterious, as it is no- 

 where else met with in the Trombidiidse. 



The maxillary palps (Fig. 4) are 5-jointed and attached 

 so far ventrally that they are not visible on dorsal view. 

 The 1st, 3rd and 4th joints are very short and of subequal 

 length. The 2nd one is the largest, twice as long as it is 

 high, almost rectangular on lateral view, with slightly con- 

 vex ventral margin, and anteriorly a little wider than po- 

 steriorly. It has one dorsal pectinate hair, inserted a little 

 behind the middle. 



The 3rd joint is as high as the 2nd one 

 hut narrows anteriorly; it is very short, 

 only half as long as it is high at the base ; 

 it has one hare bair dorsally, near the 

 posterior margin. The 4th joint narrows 

 also towards its top, so that the articula- 

 tion between the 4th and 5th joints is the 

 narrowest part of the palp; it has one dor- 

 sal hair in the middle. 

 Fig. 4. "palp, 2—5 '^^'^^^ ^^^ joint widcns from a narrow 



joints, lateral base towards the broadly rounded top, which 

 ^^^^^* ''■ is divided into 4 short and blunt tubercles. 

 It has 6 comparatively large and sharply pointed hairs, two 

 of which are dorsal, three terminal and one ventral and sub- 

 terminal; of the three terminal hairs, which are all inserted 

 on the top of the tubercles, and slightly S-curved, the upper- 

 most one points straight forward, whereas the other two 

 point obliquely upward. 



The maxillce (Fig. 2) resemble to a certain extent those 

 of Alichus, and exhibit a still greater development of the 

 remarkable features of that genus. The result is that they 

 show an astonishing conformity with those of the Parasitidse. 



