(db. a. C. OUDEMANs). NEW LIST OF DUTCH ACARI , II. 47 



4. The posterior third part of the dorsum is covered with many 

 gibbosities, which give to the posterior margin an undulated ap- 

 pearance; no trace of them are discernable in cassideus. 



5. Tlie nymph of cassideus has a broad flattened margin sur- 

 rounding the body ; on 6 places this band is less chitinized , which 

 divides the mai'gin into 6 darker fields ; these less chitinized streaks 

 are placed : 1 before tiie head ; 2 behind the anus ; 3 and 4 , 

 90 degrees remote fiom 1 and 2 ; 5 and 6 just between 1 and 

 3 and between 1 and 4. Of such a condition there is no trace 

 in the nymphs of C'dlihaena minor. 



58. Uroseius novus Oudms., nov. sp. 

 (With Plate 6, fig. 112—114). 



Only the nymphae pedunculatae are known to me. 



Length varying from 770 to 840 /<. There are two different 

 forms of nymphae , smaller and broader ones. I think the broader 

 will be proved to be female, the other male nymphae, I have 

 drawn a specimen of both forms (Fig. 112 and 113). 



The dorsal side (Fig. H 2) is quite polished ; very minute hairs 

 are regularly placed on it. Near the posterior end of the abdomen 

 two rod-like hairs project far beyond the margin ; they are scarcely 

 feathered on their distal end. 



The ventral side (Fig. 113) shows us a sterni-genital and a 

 ventri-anal shield, quite polished, each with 8 very minute hairs. 

 Further a pediferous shield with the curious peritrema, and a 

 metapodial one. The anus is marginal and directed backward. 



The legs are not so long as in Ur. vegetans (Jul. Müll.) (— acuml- 

 natus Beri.) ; the first pair is slenderer than the others ; its am- 

 bulacrum provided with sucker and claws, much smaller than those 

 of the other legs. 



The mentum differs from the common type. Instead of two 

 feathered haii's, it only bears one smooth hair, which is at first 

 trifurcate, whilst its median branch is again bifurcate (Fig. 114). 



