1
area.
M 147
160. Catches were also made in the village of Sheung Kwai Chung which lies at the head of A4 just outside the controlled Labourers employed at the Camp reside in this village. Twelve morning catches were done, 432 Anophelines captured. Out of 250 A. minimus, 92 A. jeyporiensis, 48 A. maculatus, 42 A. hyrcanus taken, 196 A. minimus, 84 A. jeyporiensis, 47 A. maculatus, 41 A. hyrcanus were captured from the animal shelters, 100 A. minimus were dissected, 2 infections were found, both these mosquitoes had been obtained in the animal houses.
161. Monthly surveys from November 1934 to August 1935 were done by the Staff of the Bureau in the fallow rice fields in the valley of A.la, part of which is now being used as a shooting school by the Skeet Company. Larvae of A. maculatus, A. minimus, A. karwari, A. splendidus were collected sometimes in fair numbers but small in comparison with those of A. hyrcanus and A. jeyporiensis. Out of a total of 17,533 larvae collected, 42% were A. jeyporiensis, 50% A. hyrcanus. Drainage of the rice fields was commenced by the Resident Medical Officer in the middle of August and completed by the end of that month. There was no difficulty in securing co-operation from the Skeet Company and other owners. On reference to the map it will be seen that all fallow rice fields considered to be of any importance, have now been drained.
162. By the end of the year Anti-malarial operations had been extended beyond the half mile circle up to the right bank of A.2 as far as the road, and from thence along both banks of A and A.4 to Sheung Kwai Chung, irrigation ditches were cleared of vegetation and the flow improved by better grading in order to make them unsuitable for A. minimus larvae; rice fields were drained as soon as the second crop had been cut, so as to destroy any larvae of A. jeyporiensis in them.
163. By these measures and those undertaken in the Skeet valley, extensive breeding grounds of A. minimus and A. jeyporiensis were done away with and satisfactory results obtained. In October 1933, the A. minimus catch was 530, the A. jeyporiensis 3,019, for 27 mornings; in October 1935, the A. minimus catch was 149, and the A. jeyporiensis 685, for 30 mornings.
164. Investigations were carried out by the Staff of the Bureau in the rice cultivations along streams A.2e, A.2f; larval collections were made early in October, in the middle of October, and at the end of October. As in former years the percentage of A. jeyporiensis larvae rose considerably by the end of the month; in the case of A.2f it was 11% of 327 larvae
1
area.
M 147
160. Catches were also made in the village of Sheung Kwai Chung which lies at the head of A4 just outside the controlled Labourers employed at the Camp reside in this village. Twelve morning catches were done, 432 Anophelines captured. Out of 250 A. minimus, 92 A. jeyporiensis, 48 A. maculatus, 42 A. hyrcanus taken, 196 A. minimus, 84 A. jeyporiensis, 47 4. maculatus, 41 A. hyrcanus were captured from the animal shelters, 100 A. minimus were dissected, 2 infections were found, both these mosquitoes had been obtained in the animal houses.
161. Monthly surveys from November 1934 to August 1935 were done by the Staff of the Bureau in the fallow rice fields. in the valley of A.la, part of which is now being used as a shooting school by the Skeet Company. Larvae of A. maculatus, A. minimus, A. karwari, A. splendidus were collected some- times in fair numbers but small in comparison with those of A. hyrcanus and A. jeyporiensis. Out of a total of 17,533 larvae collected, 42% were A. jeyporiensis, 50% A, hyrcanus. Drainage of the rice fields was commenced by the Resident Medical Officer in the middle of August and completed by the end of that month. There was no difficulty in securing co-operation from the Skeet Company and other owners. On reference to the map it will be seen that all fallow rice fields considered to be of any importance, have now been drained.
162. By the end of the year Anti-malarial operations had been extended beyond the half mile circle up to the right bank of A.2 as far as the road, and from thence along both banks of A and A.4 to Sheung Kwai Chung, irrigation ditches were cleared of vegetation and the flow improved by better grading in order to make them unsuitable for A. minimus larvae; rice fields were drained as soon as the second crop had been cut, so as to destroy any larvae of A. jeyporiensis in them.
163. By these measures and those undertaken in the Skeet valley, extensive breeding grounds of A. minimus and A. jeyporiensis were done away with and satisfactory results ob- tained. In October 1933, the A. minimus catch was 530, the A. jeyporiensis 3,019,-for 27 mornings; in October 1935, the A. minimus catch was 149, and the A. jeyporiensis 685, for 30 mornings.
164. Investigations were carried out by the Staff of the Bureau in the rice cultivations along streams A.2e, A.2ƒ; larvál collections were made early
were made early in October, in the middle of.. October, and at the end of October. As in former years the percentage of A. jeyporiensis larvae rose considerably by the end of the month; in the case of A.2f it was 11% of 327 larvae
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