M 139
on the left bank of A, and in most abundance in B. It is possible that A. maculatus can tolerate a higher degree of pollution than A. minimus and can flourish in pools and streams with a swifter current than A minimus can exist in.
Repetition of Repulse Bay area Survey.
A survey was made in a ravine at Repulse Bay during April, there had been a previous spell of dry weather and in this instance as many larvae of A. minimus were collected as of A. maculatus. Similar results were obtained in a previous survey done in 1930 after the rains.
(e) MOSQUITO NUISANCES.
Complaints as to above were investigated at Lai Chi Kok Gaol (female), the Peak District, Stubb's Road, Shek O, St. John's Cathedral. Aedes albopictus was the culprit at the Cathedral, C. fatigans in the other localities. At the Peak the larvae of C. fatigans were found in abundance in the water in gully traps. There had previously been a prolonged spell of dry weather and consequently no flushing out of the gully traps by showers. At Shek O the larvae were found in the aerobic compartment of a septic tank, other septic tanks examined in the locality were found to have both compartments covered with a thick scum and no larvae were found.
Mosquitoes captured and sent in by residents of Pokfulam were identified as C. fatigans although numerous breeding places of A. maculatus were in the vicinity, none of these figured in the catch. In this connection a complaint regarding biting insects was made by the Principal of Victoria Home, Kowloon. These were considered to belong to the Gamasidae and to be derived from birds nesting in the roof. Recommendations for dealing with the nuisance were made accordingly in all instances.
(f) INSTRUCTION OF PROBATIONERS AND TEACHING OF MOSQUITOLOGY.
The instruction of the probationers was continued during the year.
As no local infections were forthcoming from the dissections made in the early months, material was obtained from Dr. Walch, Java, and Dr. Manalang of the Philippines for the purposes of demonstration. The probationers have now had considerable practice in the diagnosis of infected midguts and salivary glands. They can make permanent mounts and stained preparations of such. They can recognize microfilaria and malarial parasites in thick blood films. They can undertake permanent preparations of the hypopygia. They have had considerable experience in obtaining Anophelines for dissecting and in keeping them alive in the Laboratory until required, in the rearing of mosquitoes from larvae and in association of any particular larva and with the corresponding mosquito.
M 139
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on the left bank of A, and in most abundance in B. It is possible that A. maculatus can tolerate a higher degree of pollution than A. minimus and can flourish in pools and streams with a swifter current than A minimus can exist in.
Repetition of Repulse Bay area Survey.
A survey was made in a ravine at Repulse Bay during April, there had been a previous spell of dry weather and in this instance as many larvae of A. minimus were collected as of A. maculatus. Similar results were obtained in a previous survey done in 1930 after the rains.
(e) MOSQUITO NUISANCES.
Complaints as to above were investigated at Lai Chi Kok Gaol (female), the Peak District, Stubb's Road, Shek 0, St. John's Cathedral. Aedes albopictus was the culprit at the Cathedral, C. fatigans in the other localities. At the Peak the larvae of C. fatigans were found in abundance in the water in gully traps. There had previously been a prolonged spell of dry weather and consequently no flushing out of the gully traps by showers. At Shek O the larvae were found in the aerobic compartment of a septic tank, other septic tanks examined in the locality were found to have both compartments covered with a thick scum and no larvae were found.
Mosquitoes captured and sent in by residents of Pokfulam were identified as C. fatigans although numerous breeding places of A. maculatus were in the vicinity, none of these figured in the catch. In this connection a complaint regarding biting insects was made by the Principal of Victoria Home, Kowloon. These were considered to belong to the Gamasidae and to be derived from birds nesting in the roof. Recommendations for dealing with the nuisance were made accordingly in all instances.
(f) INSTRUCTION OF PROBATIONERS AND TEACHING OF
MOSQUITOLOGY.
The instruction of the probationers was continued during the year.
As no local infections were forthcoming from the dissections made in the early months, material was obtained from Dr. Walch, Java, and Dr. Manalang of the Philippines for the purposes of demonstration. The probationers have now had considerable practice in the diagnosis of infected midguts and salivary glands. They can make permanent mounts and stained preparations of such. They can recognize microfilaria and malarial parasites in thick blood films. They can under- take permanent preparations of the hypopygia. They have had considerable experience in obtaining Anophelines for dissecting and in keeping them alive in the Laboratory until required. in the rearing of mosquitoes from larvae and in association of any particular larva and with the corresponding mosquito.
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