238 



Acarology 



arched with large numbers of setae. A shallow furrow separates the 

 propodosoma from the hysterosoma. The propodosoma has a median, 

 longitudinal crista metopica (Vitzthum lists Fallopia and Neosmaris 

 as exceptions) which may reach posteriorly to the middle of the dor- 

 sum. There are two sensillary areas on crista; the anterior one is often 

 far forward on a "nose," while the posterior one is usually on the 





Figure 176 Leptiis hirtipes Berlese. figure 777 Leptiis tene brans Vitz- 

 Dorsum of female. (After Vitzthum thum. Larva, (After Vitzthum 1926) 

 1926) 



posterior end of the crista; the sensillary areas each have a pair of 

 sensory setae. In mites lacking the crista, the sensory setae are located 

 in a corresponding location. Either one or two pairs of lenslike eyes 

 are present. Coxae i and ii and in and iv are in two groups; the legs 

 are long, slender and have six movable segments; the tarsi have two 

 claws, but no empodium. Five movable segments comprise the palpi 

 and the palpal tibia has a strong claw. The palpal thumb is usually 

 pear-shaped but sometimes ball-like. The chelicerae are unsegmented, 

 stylet-like, very long, capable of being withdrawn into the body, and 

 usually toothed distally. No genital suckers are present. 



