M 104
Table VI gives the adult mosquitoes obtained from pupae and large larvae. As in 1930 A. maculatus was by far the most common species met with. In hilly country the usual situations for its larvae were, seepages, small pools in the rocky beds of streams, the pools being fed by seepages or else connected with the main stream, and the edges of streams with or without vegetation. In flat country, the edges of ditches containing running water with or without vegetation.
Larvae of A. minimus were met with in similar situations. Those of A. hyrcanus favoured larger collections of water containing vegetation; in the hilly country they were met with in grassy seepages, in fair sized pools and along the edges of streams; in flat land, they were found in pools, in ditches and on the edges of swamps. Occasionally these larvae were found in pools in the hill streams without vegetation.
Culicines.
Specimens sent to the British Museum were kindly identified by Mr. Edwards as Culex virgatipes, Culex (Culiciomyia) pallidothoracis, Culex (Lophoceratomyia) infantulus, Uranotaenia testacea, and certain dark specimens with indistinct bandings of the abdomen as C. fatigans. Larvae submitted were diagnosed as probably those of Rachionotomyia bambusa and a species of Uranotaenia which may be U. testacea but which for certainty requires further investigation. It is believed that U. testacea is a new record for Hong Kong as is also the genus Rachionotomyia. Apart from the academical point of view the larvae of Uranotaenia are of interest in as much as they are liable to be mistaken for Anopheline larvae owing to the way in which they lie in the water. Larvae of Megarhinus splendens captured in October 1930 and kept in the Laboratory did not develop into mosquitoes until the end of April 1931. As in 1930 larvae of the following Culicines were collected frequently:-
Aedes albopictus, togoi, japonicus, macfarlanei; Culex fatigans, vishnui, bitaeniorhynchus, sitiens, mimeticus, pallidothoracis; Armigeres obturbans, Megarhinus splendens, and species of Lutzia.
Malaria.
From researches made in the Island of Hong Kong during 1930 and 1931, it would appear that the proximity of swamps or paddy cultivation, was not essential for the contraction of malarial infection. In the majority of places investigated, swamps, apart from boggy areas of limited extent caused by hill seepages were conspicuous by their absence, and in one locality with a well deserved reputation for malaria, even such boggy patches were not found. Proximity to hill streams seem to be an important factor for infection as in the Federated Malay States and Philippine Islands. Further investigations are required to ascertain the conditions arising from the neighbourhood of swamps,