M 146
Night catching by trapping was done by the Inspectors during January and February in a room of a house on the outskirts of the village. The house was placed at the disposal of the Bureau by the owner Mr. Li. The investigator slept on a camp bed protected by a mosquito net; outside this was a larger net hung on four poles fitting into wooden discs which rested on the floor. The larger net had flaps in the sides weighted by rollers; when in use, the flaps were rolled up. At intervals, the investigator got up, lowered the flaps, and searched for mosquitoes with an electric torch. An I.P. tent, as in 1932, was pitched near the house, and a coolie looked after it, slept there, and caught mosquitoes. Night catching was done by the Inspectors in turn. On Monday, Tuesday, and Wednesday nights of each week, the tent was inspected at 8 p.m. to ascertain if the coolie were at his post, and occasionally during the night. Catching was done at intervals until midnight in house and tent, and the coolie then brought his catching bottle with contents to the Inspector. Between midnight and dawn, another catch was made, and again before daylight. The coolie was provided with a camp bed, mosquito net, alarm clock, and torch. When not actually catching, he remained inside the net. The Inspector on duty brought the result of the catches to the laboratory on Tuesday, Wednesday, and Thursday mornings. On other days of the week, except Sundays and holidays, morning catches were done by him between 9:30 a.m. and 12:30 p.m., and the result of the tent catches of the previous night obtained. The arrangements were similar to those carried out during the greater part of 1932. From March onwards, the night catching at Mr. Li's house was discontinued. The coolie collected for one hour from dusk onwards in the tent and made another collection at dawn. From 8:30 a.m. till 11:30 a.m., he collected mosquitoes in the neighbouring huts, which the experience of the previous year had shown to be much better resting places than the village houses, and afterwards brought the catches to the laboratory. From time to time, one of the Inspectors made day catches in order to check results.
Culicines not readily obtained were captured by the tent coolie in night catches, e.g., Aedes niveus, M. (M.) uniformis, M. (C.) crassipes. His blood was examined monthly for microfilarial and malarial parasites, but as in 1932, none were found.
Results of Anopheline catches are shown in Tables IX and X.
A.
Many more A. maculatus (142 against 63) were obtained during the year than in 1932. Considering the propinquity of the tent to hill streams harbouring the larvae in abundance, the adults were as usual poorly represented in night catches. minimus was best obtained by day catching; greater numbers were captured from March onwards, and throughout the year, many more were found in the huts close to the breeding places than in those further away.
Page 510
Page 511
M 146
Night catching by trapping was done by the Inspectors during January and February in a room of a house on the outskirts of the village. The house was placed at the disposal of the Bureau by the owner Mr. Li. The investigator slept on a camp bed pro- tected by a mosquito net, outside this was a larger net hung on four poles fitting into wooden discs which rested on the floor. The larger net had flaps in the sides weighted by rollers, when in use the flaps were rolled up. At intervals the investigator got up, lowered the flaps and searched for mosquitoes with an electric torch. An I. P. tent, as in 1932 was pitched near the house and coolie looked after it, slept there and caught mosquitoes. Night catching was done by the Inspectors in turn. On Monday, Tues-
day, and Wednesday nights of each week the tent was inspected at 8 p.m. to ascertain if the coolie were at his post, and occasion- ally during the night. Catching was done at intervals until mid- night in house and tent, and the coolie then brought his catching bottle with contents to the Inspector. Between midnight and dawn another catch was made, and again before daylight. The coolie was provided with camp bed, mosquito net, alarm clock and torch. When not actually catching he remained inside the net. The Inspector on duty brought the result of the catches to the laboratory on Tuesday, Wednesday and Thursday mornings. On other days of the week, except Sundays and holidays, morning catches were done by him between 9.30 a.m. and 12.30 p.m., and the result of the tent catches of the previous night obtained. The arrangements were similar to those carried out during the greater part of 1932. From March onwards the night catching at Mr. Li's house was discontinued. The coolie collected for one hour from dusk onwards in the tent and made another collection at dawn. From 8.30 a.m. till 11.30 a.m. he collected mosquitoes in the neighbouring huts which the experience of the previous year had shown to be much better resting places than the village houses, and afterwards brought the catches to the laboratory. From time to time one of the Inspectors made day catches in order to check results.
Culicines not readily obtained were captured by the tent coolie in night catches, e.g. Aedes niveus, M. (M.) uniformis, M. (C.) crassipes. His blood was examined monthly for micro- filarial and malarial parasites but as in 1932 none were found.
Results of Anopheline catches are shown in Tables IX and X.
A.
Many more A. maculatus (142 against 63) were obtained during the year than in 1932. Considering the propinquity of the tent to hill streams harbouring the larvae in abundance, the adults were as usual poorly represented in night catches. minimus was best obtained by day catching; greater numbers were captured from March onwards, and throughout the year many more were found in the huts close to the breeding places than in those further away.
Page 510Page 511
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