M 128
day in huts thatched with palm leaf, but are difficult to get from the houses inhabited by Europeans and better class Chinese, except perhaps in dark corners and recesses. They have been captured in cow houses and piggeries in the New Territories. They are of the greatest importance as malaria carriers and also harbour filarial worms which are most likely derived from human sources.
Larvae of A. jeyporiensis were met with in numbers only during the last quarter of the year. They have been found in hill streams like the preceding, but the great majority were obtained from grassy swamps. They have also been found in grassy seepages and in wet cultivation. Most of the adults were obtained by catching during the last quarter of the year. These mosquitoes have been found infected with malaria; filaria worms have also been found in them but not in an advanced stage of development.
Very few larvae of A. karwari, A. tessellatus, A. maculipalpis and A. aitkenii were encountered during the year. Unless careful examination is made there is considerable danger of confusing the larvae of A. maculatus, A. karwari, and A. maculipalpis. Some A. minimus larvae have got poorly developed tergal plates but attention to other details will prevent a mistake. Some tentative feeding experiments on the human subject were made with A. hyrcanus, A. maculatus, A. minimus, and A. jeyporiensis, obtained from larvae hatched out in the Laboratory. The insects were kept in lamp glasses covered at both ends with mosquito netting, these were stood on damp lint. After hatching, the mosquitoes were allowed access to raisins for a day, later, by withholding the raisins, the majority could be induced to bite and take blood; in the case of A. maculatus, the raisins had to be withheld for two days but not so in the case of the others: A. hyrcanus fed most readily.
Culicines.
Larvae and adults of the following were obtained during the year. Aedes albopictus, togoi, japonicus, macfarlanei. C. quinquefasciatus (fatigans), C. vishnui, C. bitaeniorhynchus, C. mimeticus, C. (Culicioimyia) pallidothorax, C. virgatipes, Armigeres obturbans, Megarhinus splendens, Mansonia uniformis. Uranotaenia macfarlanei, a species of Uranotaenia and species of Lutzia. The following hitherto not recorded for Hong Kong have been met with and identified as Aedes niveus, Armigeres magnus, a species of Taeniorhynchus, a species of Ficalbia (probably Ficalbia luzonensis) a species of Armigeres, probably Armigeres malayi. Specimens of these have been sent to Mr. Edwards of the British Museum for his opinion. Two species of Ceratopogoninae were identified by him as Culicoides anophelis (Edw.) and as Lasiohelea (probably L. stimulans de Meig.). The former has been caught on several occasions attached to A. minimus; the latter is the little dark fly which bites viciously in the hot weather.
M 128
day in huts thatched with palm leaf, but are difficult to get from the houses inhabited by Europeans and better class Chinese, except perhaps in dark corners and recesses. They have been captured in cow houses and pigsies in the New Territories. They are of the greatest importance as malaria carriers and also harbour filarial worms which are most likely derived from human
sources.
Larvae of A. jeyporiensis were met with in numbers only during the last quarter of the year. They have been found in hill streams like the preceding, but the great majority were obtained from grassy swamps. They have also been found in grassy seepages and in wet cultivation. Most of the adults were obtained by catching during the last quarter of the year. These mosquitoes have been found infected with malaria; filaria worms have also been found in them but not in an advanced stage of development.
Very few larvae of A. karwari, A. tesselatus, A. maculipalpis and A. aitkenii were encountered during the year. Unless careful examination is made there is considerable danger of confusing the larvae of A. maculatus, A. karwari, and A. maculipalpis. Some A. minimus larvae have go: poorly developed tergal plates but attention to other details will prevent a mistake. Some ten- tative feeding experiments on the human subject were made with A. hyrcanus, A. maculatus, A. minimus, and A. jeyporiensis, obtained from larvae hatched out in the Laboratory. The insects were kept in lamp glasses covered at both ends with mosquito netting, these were stood on damp lint. After hatching, the mosquitoes were allowed access to raisins for a day, later, by withholding the raisins, the majority could be induced to bite and take blood, in the case of A, maculatus, the raisins had to be withheld for two days but not so in the case of the others: A. hyrcanus fed most readily.
Culicines.
Larvae and adults of the following were obtained during the year. Aedes albopictus, togoi, japonicus, macfarlanei. C. quin- quefasciatus (fatigans), C. vishnui, C. bitaeniorhynchus, C. mimeticus, C. (Culicioymyia) pallidothorax, C. virgatipes, Armi- geres obturbans, Megarhinus splendens, Mansonia uniformis. Uranotaenia macfarlanei, a species of Uranotaenia and species of Lutzia. The following hitherto not recorded for Hong Kong have been met with and identified as Aedes niveus, Armigeres magnus. a species of Taeniorbychus, a species of Ficalbia (probably Fical- bia luzonensis) a species of Armigeres, probably Armigeres malayi. Specimens of these have been sent to Mr. Edwards o the British Museum for his opinion. Two species of Cerato pogoninae were identified by him as Culicoides anophelis (Edw. and as Lasiohelia (probably L. stimulans de Meig.). The form has been caught on several occasions attached to A. minimu-. the latter is the little dark fly which bites viciously in the hot
No comments yet.
Private notes are available after approval.