ACARINA — PARASITES. 



333 



animals, there are others which are found on different species of the 

 same genus ; as is the case in the parasites Uving on birds of the genus 

 Larus (gulls), and the diurnal birds of prey. 2. The parasites of the 

 human body confine themselves strictly to particular regions ; when 

 they are found elsewhere, it is the result of accident. Thus, the Pedi- 



fig. 162. 



1. Parasite of Turkey. 2. Acarus of common Fowl, vmder surface. 3. Parasite of 



Pheasant. The small circles enclose each object about life size. 



culi capitis live in the head ; P. vestvmenti upon the surface of the 

 body ; the P. tabescentium on the bodies of those dying of marasmus ; 

 and the P. inguvnalis about the groins, armpits, mouth, and eyes." 

 From an examination of the structure of these animals. Dr. Burnett is 

 of opinion that they should be placed in an order by themselves, closely 

 allied to Insecta ; the mandibulate parasites occupying the highest, and 



