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stream. Monthly visits were paid in October, November, December, in October out of 86 larvae collected from the stream, 60 were A. minimus, the remainder being A. maculatus. In November 211 were A. minimus out of 266 collected; in December 318 out of 341. A total of 59 A. minimus and 1 A. maculatus adults were captured in the matsheds.
120. Of 51 A. minimus dissected, 2 were found infected. Six blood films were taken from sick persons in the lines during October and November, two of these had malarial infections.
(6) Shek O Rice Fields.
121. Collections of larvae were made from rice fields at Shek O which were irrigated by water seeping from a hill foot. The results are expressed as the number of larvae which could be collected by one man in one hour. As far as possible the same collectors were employed, the day of collection being as near the middle of the month as circumstances would allow. In June the number was 2, in July 2, in September 12, in October 10, early in November 49 whilst the rice was still uncut; in mid November 106 after the rice had been cut, at the end of November 159, in December 150.
122. The larvae collected were all A. hyrcanus until the mid November collection when about 5% were A. jeyporiensis. At the end of November there were 3% A. jeyporiensis in the collection and 1.5% in December.
123. At Wong Chok Hang in November 1982, larvae of A. jeyporiensis were found in abundance in pools amongst the rice stubble as well as those of A. hyrcanus, apparently rice fields differ as to suitability for A. jeyporiensis breeding just as streams do in regard to A. minimus.
124. It is worthy of note that the larval catch of A. hyrcanus was low in the months June, July, August, September when the catch of adults at Shing Mun Camp was also low.
(7) Streams below Shek O Club.
125. Two collections were made, one in April, one in July from the stream below Shek O Club between the junction of the Road to the Club and the Road to New Shek O Village. This portion receives the effluent from three septic tanks, rushes grow in it, the flow is sluggish, and the mouth is usually obstructed by a sand bar. In the April survey the larvae of A. hyrcanus were found in abundance, in July only one was collected.