MOSQUITOS OF SOME PORTS OF CHINA AND JAPAN. 409 



Abstract in China Med. Journal, Shanghai) in latitude 23^ 5' North, and so occasional 

 specimens may find their way north, though as a factor in the spread of yellow fever, 

 they would appear to be negligible. 



The possibility of the establishment of yellow fever in the ports visited would 

 seem to hinge on the potentiality of Stegomyia alhopicta, and possibly other very near 

 relatives, such as Aedes togoi and A. japonicus, to act as carriers of the disease. Mr. 

 Kilner stated that in Shanghai these mosquitos are not seen diu'ing the colder months 

 of the year, and this probably holds good of Fuchow, where bitter cold is also experi- 

 enced. In Japan, which feels the benefit of the North Equatorial Ocean current, 

 the seasons, especially in Nagasaki, are milder, and it would seem probable that 

 here, with a mid-winter temperature no lower than 43° 5', imagos maybe active all 

 the year round. 



The work was greatly facilitated in Fuchow by the kind and ready help of Dr. 

 Cheah and of Mr. H. S. Brand, the Secretary of the local Chamber of Commerce. 

 I must acknowledge, further, the assistance received in Shanghai from Dr. C. N. Davis, 

 the Acting Director of the Department of Public Health, and from Mr. E. Kilner, 

 Chief Sanitary Inspector, and express my indebtedness to Mr. F. W. Edwards for 

 the determinations of the mosquitos obtained. 



