HYDRACARINA FOUND AT BEAR ISLAND, JUNE 17tH, 1921. 303 



To make sure that the mite had been correctly identified, I 

 wrote to Dr. Sig Thor, sending him tracings of my figures , he was 

 away from Norway at the time, but he wrote back saying, " Your 

 Sperchon is probably a variety of S. lineatus, but it is difficult to 

 say definitely from figures alone." However, after going carefully 



Figs. 1-7. — Sperchon lineatus. 



through Dr. Sig Thor's original description and Dr. Walter's 

 description of some found in Sweden, I fail to find sufficient 

 difference to justify it being described as a new variety, so I 

 record it as Sperchon lineatus Sig Thor. 



Description op Figures. 



Fig. 1. Ventral surface, ?. X 25. 



2. Dorsal surface, $. X 25. 



3. Ventral surface, cJ. x 16. 



4. Skin markings, dorsal surface, $. 



5. Palp, ?. X 38. 



6. Genital area, ?. x 55. 



7. Provisional genital area, nymph. 



X 55. 



