198 Acarology 



is more or less extended in length with a sacklike hysterosoma. 

 The body is usually clearly (in Oehserchestes vaguely) segmented 

 into gnathosoma, propodosoma, metapodosoma, and opisthosoma by 

 sharply delineated constrictions. The skin is soft with fine striations 

 and thirty-two specially formed setae are located on the dorsum. 

 Palpi possess four or five segments, without thumb-claw complex. 

 The chelicerae are chelate. Either no eyes are present {Oehser- 

 chestes) or a small, simple, lenslike eye is located on each side of the 



propodosoma. Four sensory setae 

 are on the propodosoma. There 

 is no tectum. The legs are situated 

 far anteriorly; legs iv are special- 

 ized for jumping. The tarsi have 

 only an empodial claw which can 

 be withdrawn into a very deep 

 claw-depression. Three pairs of 

 genital suckers are present. 



Figure 140 Speleorchestes podiiroides 

 Hirst. Dorsum of female. (After Hirst 

 1917) 



Genera: 



Figure 141 Nanorchestes piilvinar 

 Grandjean. First pair of propodosomal 

 sensory setae showing arrangement of 

 the long "activating" seta and the 

 short, true sensory seta. (After Grand- 

 jean 1942) 



1. Nanorchestes Topsent and Trouessart, 1890 (= Moimlichiis Berlese, 



1904) 

 Type. Nanorchestes amphibius Topsent and Trouessart, 1890 



2. Speleorchestes Tv'?igkYd\\, 1909 {— Leptalicus Berlese, 1910). 

 Type. Speleorchestes formicoriim Tragardh, 1909 



3. Oehserchestes Jacot, 1939 (= Coccorchestes Jacot, 1938 nom. prae- 



occ.) 

 Type. Coccorchestes humicoliis Jacot, 1938 



