ACARINA - PARASITES. 



461 



pits, mouth, and eyes." From an examination of the 

 structure of these parasites, Dr. Burnett is of opinion that 







Fig. 226. 



1, Acarus of Beetle. 2, Acarus of Fly. 3, Acarus of Clothes-Moth. (The circles 

 enclose each about life size.) 



they should be placed in an order by themselves, closely 

 allied to Insecta; the mandibulate parasites occupying the 

 highest, and the haustellate the lowest position in the 

 order: thus confirming to some extent the observations 

 made by Mr. Denny. 



There is a remarkable species of acarus described by 



