APPENDIX B.
ANNUAL REPORT OF THE WORK OF THE MALARIA BUREAU FOR THE YEAR 1931.
by
R. B. JACKSON, M.D., D.P.H., MALARIOLOGIST.
Staff.
Dr. R. B. Jackson was absent on leave from 29th April to 11th December during which period Dr. R. S. Begbie acted as Malariologist. The remainder of the Staff consisted of, the Assistant to the Malariologist, four probationer Inspectors, one clerk, and two coolies.
2. The work carried out during the year was included under the following headings.
(a) General mosquito survey of the Colony and New Territory, in order to determine what species exist, and, as far as possible, their life histories, and identifications, in the larval and adult stages.
(b) A general investigation of malaria and other mosquito-borne diseases.
(c) The catching of mosquitoes frequenting habitations, their identification and the dissections of such Anophelines as were found.
(d) Investigations as to the prevalence of malaria in certain areas with a view to its abolition.
(e) Local mosquito surveys for the abatement of mosquito nuisance.
(f) The teaching of mosquitology, and the instruction of the probationers in this and other subjects.
(g) Co-operation with Government Departments, the Military, Naval and Air Forces, public companies and private individuals in the investigation and eradication of malaria.
Investigation of species. Anophelines.
In addition to those met with in 1930, namely, A. maculatus, A. hyrcanus, A. minimus, A. karwari, A. aitkeni, and A. jeyporiensis; pupae of A. tesselatus and of A. maculipalpis were found, during a larval survey of Kowloon Tong towards the end of the year. Those of A. tesselatus were associated with larvae of A. maculatus and of A. hyrcanus, and found in a ditch with grass growing at the edges. The pupae of A. maculipalpis were met with in a similar situation, accompanied by larvae of A. hyrcanus. The numbers and species of the various larvae collected and examined throughout the year are given in Table V: