Fasc. XXXI N. 7 



AtaX FaBR. 1805 



llydraclma (ex p.) Miiller, Hydracnae etc. p. 41. 

 Trombidium (ex p.) Fabricius, Entom. system. II, p. 400. 

 zj:tax (ex p.) idemi, syst, Antliat. p. 364. 



» (ex p.) Duges, Sc. nat. t. i, p. 5. 



» C. L. Koch, Uibersicht des Arachn. Syst. p. 3, 



» Bruzelius, Beskr. Hydrachn,, som forek. 1 



Skaone, p. 8. 

 » Claparede, Studien an Acariden p. 446. 

 » Kramer, Beitr. zur Naturgesch. der Hydr. p. 292. 

 » Neumann, Sveriges Hydrachnider p. 20. 



Obs. Ccrpus subglobosum, saepe truncatum, pc- 

 stice tubercuUs piligeris. 



Palpi, (1) segmentis quinque compositi, aliquan- 

 do auctum, articulis secundo et quarto, ceteris lon- 

 gioribus. Articulus quartus sub apicem (2) tuberculis 

 pih"geris auctum., articulus postremus apice triden- 

 tulatus. Sternum scutulis quatuor constitutum, sive 

 cruce membranacea divisum. Pedes primi paris (3) et 

 secundi, ceteris crassiores, spinosi, spinis tum basi 

 articulatis, squamula nigra, bidenti, protectis. Pedes 

 ceteri natatorii spinulosi, in quarto pari, sub articulo- 

 rum apicem seta subplumosa aucti. 



Tarsi unguiculis duabus (7} simplicibus terminati. 



Discularia subovalia, integra, vel in quoque la- 

 tere laminulis duabus constituta, disculis 6-3o per- 

 fcrata. 



p. 8. 



