(dr. a. c. oudbmans). notes on acari. 133 ' 



claw. — He found it under a flowerpot, apparently in liis garden, 

 consequently in moist vegetable earth. — 



In 4 781 Schrank gave it the name oi Acarus denüculatns (Schrank, 

 Etiumeratio Inseciorum Austriae indlgenortim, p. 520, n". 1070). 



In 1826 Von Heyden {Isis, p. 608) gives a systematic division 

 of the Acari. We will follow him verbally : Legion I, with 8 legs ; 

 Phalanx 2, without eyes; Section 2, the mouth parts on the under- 

 side of the body ; Division 6, head, thorax and abdomen have fused ; 

 Subdivion 2, without visible palps; b, all the legs with a bifid 

 claw : 54th genus : Panojilia, type Acarus dentlculatus Schrank. — 

 We observe that Von Heyden has changed Schrank's discriplion 

 of the ends of the legs: «a two-pieced sole» into «a bifid claw.» 

 We may safely admit that Von Heyden has not had the creature 

 under examination. — At all events the generic name PanojiUa 

 must be abandoned, as it is preoccupied by Hübner, 1816, for 

 Lepidopiera. 



In 1877 Canestrini and Fanzago described and delineated an 

 Acarus under the name of Nicoleiia cornuta {Att. K. 1st. Ven. Sc. 

 Lett, ed Art., ser 5, v. IV, p. 52, lab. 3, fig. 2). When we 

 carefully compare their drawing and description with those of 

 Schrank, we are obliged to admit the identity of the two creatures. 

 There may be one objection: Schrank describes the legs ending 

 in «a two-pieced sole», whilst Canestrini and Fanzago do not 

 describe these parts, but delineate all the legs ending in two claws. 

 We may safely admit that the instruments of Schrank were so 

 imperfect, that he has not well interpreted what he saw. I say 

 we may safely do this, because latter examinators of this singular 

 Acarus unanimously describe the foi^e-legs ending in two claws, 

 and the other six legs in three claws, so that even Canestrini 

 and Fanzago are mistaken in this respect I — At all events the 

 generic name of Nicoletia must be abandoned, as it is preoccupied 

 by Gervais, 18 . ., for TJiysauura. 



In 1879 Kramer (Arch. f. Naturg., v. 45, p. 13, tab. 2, fig. 

 la — li) described and dehneated an Acarus under the name of 

 Labidostomma luteum. The first leg end in two claws, whilst the 



