1912] Eiviitg and Wcbsta — Mites Associated with the Oijster-Shell Scale 125 



strange to say, he described the real (Acarus?) Hemisarcoptes ma- 

 lus of Shinier as a new species, coccisugus, erecting for it at that 

 time the genus Hemisarcoptes. On the other hand the name of 

 TyroglypJms (Acarus) mdlus Shinier was given to the second mite 

 present, which is no other than Laboulbene's Monieziella entomo- 

 phaga. That Lignieres had confused the names of these two 

 species has ah-eady been shown by Micheal and also by Banks. 

 An examination of Lignieres' paper and figures shows that their 

 conclusions were correct. 



To summarize, we may make the following statements regard- 

 ing the identity of the species under consideration and its confu- 

 sion with Monieziella entomophaga (Lab.). 



1. Acarus mains Shimer is the same as Hemisarcoptes coccisugus Lignieres. 



2. The name should be written Hemisarcoptes mulus (Shimer), since Lignieres' 

 genus is a good one, although his species is not. 



3. The mite figured by Riley (187^^) as a possible variety of Shimer's Acarus 

 malus is Monieziella entomophaga (Lab.). 



4. The description accompanying Riley's figure (1873) refers both to Monie- 

 ziella entomophaga and to Hemisarcoptes malus. 



5. The species considered by Lignieres as Tijroijlyphus malus Shimer is Monic- 

 'iiella entomophaga (Lab.). 



In this connection it must be stated thfit Banks (1906) has de- 

 scribed a species which he calls Monieziella angusta, which may or 

 may not be the same as Monieziella entomophaga (Lab.). Banks 

 has considered that his species and the one figured by Riley (1873) 

 were probably the same, while Michael thinks that Riley's figure 

 refers to Monieziella entomophaga (Lab.). 



Habits. The individuals of this species are about the same size 

 as the eggs of the oyster-shell scale. They can easily be distin- 

 guished from other mites present under these scales by the fact 

 that the tarsi of their legs end each in a rather short pedicle, which 

 bears at its end a small cup-like sucker. The mites walk easily 

 about, and when doing so drag after them a few very long bristles, 

 whjch are not attached to the abdomen, but to the tarsi of the 

 posterior group of legs. 



These mites are found invariably under scales that contain at 

 least a few sound eggs, and never under old scales where there is 

 only decaying animal matter. Shimer (1868) and Walsh (1868) 

 also, noticed the predaceous habits of this mite in Illinois at 



