THE ACARINA OR MITES. 



101 



They are very sluggish in their movements, and if disturbed will remain motionless for 15 

 minutes or more. Several species cover their abdomen with bits of dirt. The nymphs 

 have a considerable resemblance to the adult, and have frequently been described as 



Fig. 203. — NeoJiodes concentricus. 

 (Author's illustration.) 



Fig. 204.— Venter of a 

 Kothrus. (Author's 

 illustration.) 



Fig. 205.— Nothrus banksi. (Author's 

 illustration.) 



Fig. 20C. — Nothrus truncatus. Fig. 207.— iVo//irti5 taurinus. 



(Author's illustration.) (Original.) 



mature mites. Quite a number prefer aquatic or semiaquatic situations, and probably 

 feed on the aquatic vegetation. The species of Ilypochthonius look like nymphs, and 

 have a soft skin and monodactyle claws; the segmented abdomen separates the genus 

 from allied forms. H. teocaniLS Banks (fig. 208) occurs in the nest of a Texas ant; 



