DEPARTMENT OF ZOOLOGY. 12T 



A Mite {Tyroglyphus longior), infesting larder, was deter- 

 mined and advice was given. 



A Mite [Tyroglyj)}ius loThgior), destroying packets of egg- 

 powder in shops, was determined and advice was given. 



A Mite (Py gmephorus tarsalis, sp.n.), found in very large 

 numbers on the surface of cultivated mushrooms, was described. 

 A Mite [Aleurobhfs farince), found in the faeces of minervS 

 suffering from ankylostomiasis, was determined. 



An enquiry on the habits of " Harvest Bug " [Leytus autumn- 

 alis) was answered. 



Poultry Mites were determined for the U.S. Department of 

 Agriculture. 



A Mite {Liponyssus bursa), found on a Chinese patient at 

 H6ko-t6 Island, Formosa, was determined. 



IV. Crustacea. 



Marine Isopoda destructive to timber have been studied and 

 a report has been prepared for publication. 



Woodlice reported to be damaging Mushroom-beds have been 

 determined. 



y. Worms. 



Human parasites, and parasites of domestic animals, have 

 been named on several occasions, and enquiries from numerous 

 correspondents, including various Public Health Officers and 

 agricultural institutions, have been answered. 



Assistance has been given to the Wellcome Bureau of Scien- 

 tific Research, in connection with work on the parasites of rats. 



VI. Cgelenterata. 



Correspondence took place between the Museum and the 

 Imperial Institute with reference to possible economic uses for 

 the " Organ Pipe " coral Tuhipora. 



VII. — Students and Visitors. 



The number of visits paid to the Zoological Department 

 during the year 1920 by students and other persons requiring 

 assistance or information amounted to 8,973. This number in- 

 cludes the visits paid by students holding tickets entitling them 

 to do special work in the Exhibition Galleries. 



In the 10 previous years the numbers were as follows, in- 

 cluding from 1910 to 1912 the visits to the Entomological Sec- 

 tion, which was made a separate Department in 1913 : — 



7,459 in the year 1919. 



5,553 



1918. 



6,314 



1917. 



7,018 



1916. 



8,020 



1915. 



9,235 



1914. 



9,982 „ 1913. 



12,564 



1912. 



12,175 



1911. 



12,443 



1910. 





C. Tate Regan 



