67 



THE STEGOMYIA SURVEY IN HONG KONG. 



In view of the possible danger of the introduction of yellow fever into the Far East 

 the Government of Hong Kong has instituted a very thorough investigation of the 

 mosquitos occurring in the Colony, and the Governor has recently forwarded to the 

 Colonial Office an interim report by Dr. Harold Macfarlane, the Government 

 Bacteriologist, to whom the work has been entrusted. 



Dr. Macfarlane states that up to the beginning of this year 14,909 samples of larvae 

 had been collected, and from these 41,000 adult mosquitos had been bred out and 

 pinned. Over 21,000 specimens were forwarded to the Imperial Bureau of 

 Entomology, all of which were identified by Mr. F. W. Edwards, of the British 

 Museum, and Dr. Macfarlane has himseK uamed a further 5,000 from named specimens 

 returned to him by the Bureau. 



The following is a hst of the species so far found in Hong Kong : — 



Anopheles indiensis, Theo. .Culex bitaeniorhynchus, Giles. 



,, jeyporiensis, Theo. ^ * ,, concolor, R.D. 



,, karwari, James. • '^* „ fatigans, Wied. 



* ,, maculatus, Theo. ,, fuscocephalus, Theo. 



* , minimus, Theo. ,, mimeticus, Noe. 

 ,, rossi, Theo. var. ,, sinensis, Wied. 



indefinatus, Ludl. w^' ,, sitiens, Theo. 



* ,, sinensis, Wied. ^ -' * ,, tritaeniorhynchus, Giles. 

 ,, tessellatus, Theo.. ,, virgatipes, Edw. 



Stegomyia fasciata, F. y „ vishnui, Theo. 



* ,, scutellaris, Wlk. Ficalbia minima, Theo. 



,, w-alba, Theo. Lophoceratomyia minutissima, Theo. 



^Armigeres ohturhans. Walk. ,, rubithoracis, Leic. 



Ochelorotatus macfarlanei, Edw. Mansonioides uniformis, Theo. 



,, togoi, Theo. Micraedes 7nalayi, Leic. 



Culiciomyia pallidothorax, Theo. Uranotaenia macfarlanei, Edw. 



In 1902 Dr. J. C. Thomson made a report upon the mosquitos of Hong Kong and 

 noted the occurrence of eight species, which are indicated by an asterisk in the fore- 

 going list. The remaining species had not been previously recorded from the Colony 

 and include three species new to science. 



Of the three species of Stegomyia which occur in the locality, S. w-alba appears to 

 be rare, as it has been found only twice, being bred from larvae taken from a hill-side. 

 S. scutellaris is probably the commonest mosquito in Hong Kong. During the summer 

 it is found in practically every Chinese house, breeding in small collections of water in 

 old pots, tins, etc., and it is also found away from houses. It does not appear to matter 

 whether the water in which it breeds is clean or dirty. The search for S. fasciata has 

 given considerable trouble, but the most recent results show that it not only exists, 

 but is also much more prevalent than might be thought. 



In Kowloon 96 separate finds of S. fasciata larvae were made between the 15th April 

 and 29th September, 1914 ; but the European half of Kowloon Point had not yet been 

 examined. Of the 64 finds of these larvae made by Dr. Macfarlane himself, between 

 the 19th August and 23rd September, no less than 53 (84 per cent.) were obtained in 

 stored clean water used for drinking, cooking, etc. In every case the larvae were found 

 (C155) e2 



