Trombidiformes 



203 



chelicerae are opposed and there is no claw-thumb complex on the 

 palpus. The legs are five-segmented and the femur is divided into 

 basi- and telofemur; trochanters i and ii are also divided. All tarsi have 

 a single retractable claw (pulvillus). Two pairs of genital suckers are 

 present. 



Genus: 



Alicorhagia Berlese, 1910 (= Willania Oudemans, 1931 — Episto- 



malyciis Thor, 1931) 

 Type. Alicorhagia fragilis Berlese, 1910 



Discussion: Grandjean 1939 reports Alicorhagia fragilis Berlese as 

 being common in forest humus in France. 



Reference: 



Grandjean, F. 1939. Quelques genres d'acariens appartenant au groupe 

 des Endeostigmata. Ann. des Sci. Nat., Zool,, Ser. 11, 2:1—122. 



Raphignathidae Kramer, 1877 



(= Stigmaeidae Oudemans, 1931; Caligonellidae Grandjean, 

 Figures 151-154 



Diagnosis: The raphignathids 

 are small, red mites, round in 

 shape, with no suture or no dis- 

 tinct suture between the propo- 

 dosoma and the hysterosoma. 

 They may or may not have vari- 

 ous numbers of shields. 



1944) 



Figure 151 Homocaligiis sp. Palpus 

 showing thumb and claw. (After 

 Grandjean 1946) 



Figure 152 Mediolata niali (Ewing). 

 Dorsum of female. 



