ACARINA PARASITES. 



459 



twice as long as broad; after a time, from the sides and 

 one extremity of this 

 ovum, the legs and pro- 

 boscis begin to protrude. 

 These stages of the de- 

 velopment of the'acarus 

 are exhibited in fig. 222. 

 The Acarus farinoz, 

 Flour-mite. This is of 

 occasional occurrence in 

 flour, but is never pre- 

 sent unless it has be- 

 come damaged. Any 

 flour, therefore, contain- 

 ing the animal in ques- 

 tion is in a state unfit 

 for consumption. We 

 believe that it is found 

 more frequently in the 

 flour of the Leguminosce 

 than that of the Gra- 

 minece. 



This acarus differs con- 

 siderably in structure 

 from the Sugar-mite, 

 particularly so in its 

 pennate setae. 



Dr. Burnett esta- 

 blished to his satisfac- 

 tion the following facts : 

 " 1. That though there 

 are single species of pa- 

 rasites peculiar to parti- 

 cular animals/ there are 

 others which are found 

 on different species of 

 the same genus; as is 

 the case in the para- 

 sites living on birds of 

 the genus Larus (gulls), 



t and i'emale, parasite 



