64 List OF ÜUTCH \CAfel. 



12. — As I have not yet had the upportunity to consult all 

 the existing works on Oribaftii, I have on purpose avoided to giv 3 

 new names to the genera 7/(?/;/ö/j/wr(^ Koch., Leiosoma i>iic., Cepkeus 

 Nic. , nor to the undetermined species , neither to the apparently 

 new genus, to which the species n". 66, 67 and 68 belong. 



13. The Orihatei wait for a throrough revision. The genera are 

 not well defined. The species of the genus iVöZ/^m-y (= Zior/^-? Heyd ?) 

 are said to have three claws, but I have species with one claw, 

 and I am sure of it that they are not ni/mphae , but fullgrown. 

 Among the species of Koch, belonging to the genus Orlhates of 

 Latreille, there are several of which the wing-like expansions 

 are not movable , and do not protect the legs. Many species of 

 Koch are not well understood by later observers. Some species of 

 Eremaeus have no ai chad abdomen , but a hollow one. Many species 

 of Leiosoma have nymphae with fan -shaped hairs which stand in 

 the circumference of the body, as many larvae oiCepheus^ic. have 

 too. Grube has given the generic name Telonia to such nymphae, 

 though he doubted of the mature stage of these animals. Now it 

 is clear that such species with the same nymphal aspect belong 

 to one group (be it a genus or a so called family) and not to two 

 groups in which species are intercalated with nymphae of quite a 

 different aspect. 



14. As the term thorax in Arthropods is exclusively used for that 

 part of the body, which bears the legs, the term céphalothorax 

 cannot be used in sicari, as they have no distinct thorax. The 

 céphalothorax of the spiders contains six segments, if we abandon 

 the praeoral segment or segments. If the authors speak of céphalo- 

 thorax in Acari ^ they mean that portion of the animal which only 

 bears the head and the first two pairs of legs. Even in Hoplophora 

 the first two pairs of legs belong to the so called céphalothorax, 

 and the last two pairs to the so called abdomen. This is clearly seen 

 when a Hoplophora with extended legs is crushed by a lateral pression ; 

 then the body divides itself into two parts, one of which bears the 

 head, two pairs of legs and the protecting shield, and the other 

 bears the so-called abdomen with the last two pairs of legs. 



