170 (dr. a. c. oubemans). new t.tst of dutch acari, I. 



The « key » on p. 54 of « Das Tierreich , Oribatidae » therefore 

 should be changed as follows: 



6, for veriicillipes read 0. michaeli. 



Femora gradually davate , projection between 



legs 1 and 2 blunt anteriorly .... 0. geniculata. 

 15. ^ Femora with thin proximal part, distal sud- 

 denly enlarged; projection between legs 1 

 and 2 pointed anteriorly — \ha. 

 Legs scarcely longer than body ; Intlam. hairs 



longer than Psst. org 0. verticillipes. 



Legs much longer than body; Intlam. hairs 



short, setiform, sharply curved. ... clavipes. 



15ß. 



Hoploderma dasypus (Ant. Dug) and italicum Oudms. 



Michael, Das Tierreich, Oribatidae, p. 79, diagnosing Hoplo- 

 derma glolosum (G. L. Koch), asks: « ? if really distinct from 

 H. dasypus ». I am of the opinion of no. I have examined some 

 hundreds of specimens, varying in length from 0,435 to 1,33 mm. , 

 and have observed that the pseudostigmatic organs are long-fusiform 

 and distinctly visible in small , and of the same size , consequently 

 relatively much shorter-fusiform in big specimens. Between these 

 two there are many transitions. All my specimens have the so- 

 called « depression » on the céphalothorax. 



In a side-view the height of animals of the same length may 

 vary greatly, also the breadth, so that some have a nearly glo- 

 bular abdomen — glohosus Koch. The hairs much differ, varying 

 from nearly invisible thin and short to well developed and curved 

 backward — crinita Koch. 



I believe Hoploderma dasyims Berlese (non Dug) to be quite 

 another species, for I cannot suppose that Berlese and Canestini 

 should have described and delineated a long setiform psstg. org., instead 

 of a short fusiform one, if the latter was present. I propose to 

 call it Hojiloderma italicum Oudms. The « key » on p. 78 of 

 « Das Tierreich , Oribatidae » is to be changed as follows : 



Psstg. org. shorter, fusiform H. dasypus. 



Psstg. org. long, setiform H. italicum. 



