(dr. a. c. oudemans) notes on acabi. 177 



already used this name for certain ITi/menoptera in 1834, and Kocii 

 for certain Gamasides in 1836, the name Notaspis Nic. cannot be 

 kept as generic name. 



Grube (A.rch. f. Naturgesch. Liv- , Ehst- und Kurlands (2) I , 

 p. 463), though wrongly, proposed Koch's name Oppia as the 

 generic name, to take the place of A'o;!a<y^iò' of Nicolet, and herein 

 he was followed by Canestrini and Fanzago (Atti del Reale Istituto 

 Veneto di Scienze Lettereet Arti, 5th. series, Vol. IV, p. 9 and 20). 



Koch (Deutschlands Crustaceen Myriapoden und Arachniden , 

 Heft 3, n°. 9, 1836) used already the generic name Oiipia for 

 Oppia glaucina Koch; but as this animal is nothing else but a 

 nympha of Belba geniculata Linné, totally bereaved from its hairs, 

 perhaps by rough manipulation, the name Oppia Koch, 1836 is 

 synonym to Belba Heyd, 1826. — Consequently Opjsia Grube (non 

 Koch) can be used to take the place of Notaspis Nic. 



As to the specific name, Schrank's denomination of coufervae 

 must be adopted by the rules of priority. So the animal must be 

 called Oppia confervae Schrank. 



Synonyms: Äcarus coufervae Schrank. 

 Notaspis lacustris Michael. 



I have now to point out that Schrank's Äcarus confervae is the 

 same as the animal which I found amongst Confervaceae , attached 

 on the roots of Lemna, etc., but always underwater, and moving 

 slowly. 



Really the animal is oval and brown , with the second article 

 of the legs (genual) being the smallest, and with the third of them 

 (tibia) being provided with a long hair (see fig. 2). It is small ; 

 brown with paler legs. Its figure is globular, viz. arched above, 

 flat below , and anteriorly acuminated. The legs are equal in length 

 and structure. If the bases (coxae) are out of. consideration , there 

 are constantly five articles. If we compare Schrank's figure (see fig. 1) , 

 we observe that his fifth article is a strong claw, perfectly as in 

 our animal (see fig. 2). The first, the third and the fourth article 

 (femur, tibia, tarsus) are slender, on the distal end of the third 

 article (tibia) a long hair projects. The 2d article (genual) is small; 



