348 Acarology 



Discussion: Oudemans published very little on this group, apparently 

 giving just enough information to include the mite in his key. 



Reference: 



Oudemans, A. C. 1927. Acarologische aanteekeningen LXXXVI. Ent. 

 Ber. 7: 242-248. 



Olafseniidae Oudemans, 1927 



Figure 277 



Figure 277 Olafsenia trifoUiim 

 (Oudemans). Dorsum of nymph. 

 (After Oudemans 1901 ) 



Diagnosis: This family is known 

 only from the homeomorphic nymph. 

 It (according to Vitzthum) is proba- 

 bly without a propodosomatic shield 

 and has a smooth skin. On the poste- 

 rior part of the propodosoma is a 

 transverse row of two very long setae. 

 There is also a pair of long setae on 

 the shoulder and posterior of the 

 hysterosoma. A pair of vertical setae 

 is present as are marginal cervical 

 setae which are weak and in the form 

 of a bent spine. All tarsi have lance- 

 like or spoonlike ''adhesive" setae. 

 The tarsi have unsegmented claws 

 and caruncles and the claws have a 

 knoblike swelling on the venter. Epi- 

 mera i form a Y. 



Genus: 



Olafsenia Oudemans, 1924 



Type. Tyroglyphus trifolium Oudemans, 1901 



Discussion: The single species, Olafsenia trifolium (Oudemans), a 

 nymph, was collected from Heliocopris bucephalus from Java. 



Reference: 



Oudemans, A. C. 1901. Notes on Acari. Third series. Tijd. Dierkundige 

 Ver., Ser. 2, 50-88. 



