61 



Travelling mjmph. Length 2500 — 3000 yt.. Colour: the usual 

 brownish-yellow of inites living on Bombus, etc. ; yet the front- 

 half of the mite is darker than the hiuder-part ; this is already 

 visible to the naked eye. 



Dorsal side (Fig. 30). It is protected by only one shield of a 

 peculiar form. It is as it were fornied by the fusion of two shields, 

 an anterior and a posterior one; the former covering soruewhat 

 more than the fore-half, the latter being somewhat narrower, leaving 

 the sides of the hinder-part bare. To the right and to the left 

 the angles, formed by these two parts are as if eroded. The 

 two eroded parts of one and the same individual are never alike. 

 Sometimes it niay even happen, that in the shield a part is weak 

 (see Fig. 30 to the left), and sometimes quite the contrary is the 

 case (see Fig. 30 to the right). The hairs are strong, short, curved, 

 ranged in two or three rows along the sides ; part of the dorsum 

 is nearly destitute of hairs, whilst there are some small ones 

 in the centre. 



The ventral side shows us the folio wing particulars (Fig. 31). 

 The sternal shield is sub-semi-circular ; its hind-margin showing 

 erosion. The genital shield is long, with rounded hind-margin and 

 indistinct fore-margin. The anal shield is subtriangular. Eight 

 long bristles are planted in the space occupied by the sternal and 

 genital shields. On the sides of the genital shield two long bristles. 

 Mentum present. 



Hypostoma (Fig. 32) dark coloured, with transparent broad and 

 flat horns, and long feathered interior raalae. 



Epistoma (Fig. 33) triangular, transparent, with plaiu edges. 



C/ielae (Fig. 34) small; immovable finger with indistinct cheek- 

 tooth, distinct, but small dog-tooth, and well developed sense-hair. 

 Movable finger larger than the immovable one, similar to it. 

 Flagellum only indicated by a few hairs. 



Stigma without tubular peritrema, but provided with an oblong 

 vestibulum, a kind of pan, the edges of which are directed toward 

 the centre, and striated (Fig. 31). When we crush the mite 

 and examine the stigma on its inner side (Fig. 35), the bottom 



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