160 



Acarology 



In Locustacarus trachealis Ewing the sexually mature female retains 

 the appearance of the larvae and the posterior setae, which are lost in 

 the other members of the family. The TarsopoUpus are the least de- 

 generate. The male has four pairs of normal legs but appears similar 

 to the males of the other genera which have only three pairs of legs. 

 The female has three pairs of legs, the third pair being on the pos- 

 terior portion of the body. During the parasitic life the body becomes 

 strongly swollen. Both the males and females of Eutarsopolipus are 



similar to the larvae in having 

 three pairs of legs. In the female 

 during the parasitic stage the hys- 

 terosoma stretches so that the 

 third pair of legs moves posteriorly 

 to give the mite a flasklike shape. 

 In the Tetrapolipiis the male has 

 three pairs of legs but the female 

 loses the third pair. Legs i and ii 

 are quite short but maintain the 

 normal segmentation. During par- 

 asitism the body swells to about 

 three times its length. The male of 

 Podapolipus has the three pairs of 

 legs but the female develops from 

 the larva into a completely degen- 

 erate form with only the first pair 

 of legs present. These legs are ex- 

 tremely short but are divided into three to five segments. In the position 

 where legs ii would join the body are two diverticulae which flank the 

 sides of the gnathosoma to give the anterior end of the body a charac- 

 teristic appearance. The body may become rather swollen and the 

 shape depends upon gravity and other external influences. 

 Genera: 



Figure 107 Locustacarus 

 Ewing. Young female. 



trachealis 



3. 



Podapolipus Rovelli and Grassi, 1888 (= Pimelofia Tragardh, 



Type, Podapolipus reconditus Rovelli and Grassi, 1888 



Eutarsopolipus Berlese, 1913 



Type. Eutarsopolipus lagenaeformis Berlese, 1913 



Locustacarus Ewing, 1924 



Type. Locustacarus trachealis Ewing, 1924 



TarsopoUpus Berlese, 1911 



Type. TarsopoUpus corrugatus Berlese, 1911 



1902) 



