176 (de. a. c. oudemans) notes on acabi. 



seta longa porrigitur. Articulus secundus brevis, fere globosus , 

 quintus itidem brevis, sed oblongus , apice unguicuUs armatus. 

 Pedes omnes pilis nonnuUis brevibus sparsis leviter horrent, sed 

 corpus nudum, nee nisi ad rostrum setis duabus, quasi antennis, 

 brevibus instructum ». 



a Habitat in conferva; extra aquam moritur; in aqua superfieiem 

 nunquam petit, necvagatur, sed in lìlamentis confervae obambulat ». 



« Lectus sub fineni Martii ». 



Schrank gives a very imperfect figure of the animal in question 

 in his Tab. Ill, fig. 5. I have reproduced it in my Tab. 10 fig. 1. 

 On the back of tlie metasoma (abdomen) and on the left side of the 

 snout respectively 1 and 2 spade-shaped appendages are delineated, 

 which according to Schrank's Explicatio tabularum are Fortlcellae: 



«Polypi campanulati species [Vorticella rmf/ens , Mull.) insecto 

 adhaerens ». ' 



This Acarus is mentioned by Gmelin in his Sijstema Naturae 

 sub n". 59, 1790, by Turton in his System of Nature, p. 707, 

 1802, and by Gervais in his Histoire naturelle des Insectes, Ap- 

 tères, III, p. 253, 1844, under the name of Acarus confervae, 

 but without any further information; evidently these authors did 

 not know this Acarus by own observation. 



Albert D. Michael in his British Oribatidae, London, 1884, 

 Vol. I , p. 57 , speaks of an aquatic monodactyle Notaspis , wjiich 

 he calls Notaspis lacustris. I am not aware of he having described 

 or figured this species elsewhere. Yet I am fully convinced of the 

 fact that Schrank's Acarus confervae d,x\i\.W\ç\\k'^\J ^ N otaspis lacus- 

 tris are one and the same species. 



As to the generic name, I am of opinion that Notas^iis cannot 

 be employed, for the following reason. 



Hermann's genus Notaspis (Mémoire Aptérologique, Strassburg, 

 1804, p. 12, 15, 87) having Acariis coleoptratus his-nt ?ifi {.^\^e , \?, 

 synonym to Latreille's genus Orihates (Olivier's Encyclopédie mé- 

 thodique, 1795), which has Acarus coleoptratns Linné as type too. 



Nicolet (Arch. Mus. VII.) used Hermann's name Notaspis as 

 generic name for Notaspis hipilis Herm. as type. But as Walker 



