204 



Acarology 



The integument is finely striated between the dorsal shields. One or 

 two pairs of lenslike eyes may be present. The propodosomal sensory 

 setae are undifferentiated. These mites have peritremes which at times 

 enter into the basal portion of the chelicerae. The moderately long 

 cylindrical palpal tarsus is located ventrally on the palpal tibia be- 

 neath a small to large tibial claw; the movable chela is stylet-like for 

 piercing. All tarsi have two claws and a rayed pulvillus; tarsi i and ii 

 each have a single sensory organ. The coxae are either contiguous or 

 separated into two groups. There are no genital suckers and the anal 

 opening is either posterior or posterior dorsal. 



Figure 153 Raphignathiis sp. Dorsal 

 view of gnathosoma. 



Figure 154 Raphignathiis cardinalis 

 (Ewing). Dorsum of female. 



The discovery of two genera with the peritremes in the cheliceral 

 bases but with large palpal claws and terminal anus has led to com- 

 bining these three families, since they now grade into one another 

 and since there are no clear-cut, so-called family characters. 



Genera: 



1 



Raphignathiis Duges, 1834 (= Syncaligus Berlese, 



Type. Raphignathiis ruberrimus Duges, 1834 



Acheles Oudemans, 1903 



Type. Acheles mirahilis Oudemans, 1903 



Apostigmaeiis Grandjean, 1944 



Type. Apostigmaeiis navicella Grandjean, 1944 



Barbiitia Oudemans, 1927 



Type. Stigmaeus anguineus Berlese, 1910 



1910) 



