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HONG KONG DAILY PRESS, FRIDAY, MARCH 25, 1932.
MOSQUITOES!
NATURE AND HABITS DESCRIBED.
MALARIOLOGISTS LECTURE
·AT "VARSITY,
BARONET'S ASHES THROWN ON SEA
SON FULFILS HIS FATHER'S WISH,
Following aromation at Woking the ashes of Sir John Brickwood, Bart, chairman and managing. Dr. A, B. Jackson, M.D., the director of the well-known Ports- Government malariologist, gavo mouth brewery firm which boars his most interesting lecture on mosqui- name, were sattared in the sea at toss, yesterday evening, before tho
Spithand, Hong Kong University Medienl Society. The subject is of import ance to everyone in the Colony and we are publishing the address in two parts, the latter half to be given in our leane of Monday,
Dr. Jackson said.......
This was done by his oldest son and successor to the baronetcy, Sir Buport Radvers Brickwood.
In addition to members of the family only personal friends and about 90 of the oldest employees of the firm were present.
The majority of medical students
On arrival of the ashes at of this University wilt, 1 presume, Fortsmouth the party went to Spit practise their profession in the rehead in the forry launch Princesen, gions of the Tropics or sub-Tropics, and in consigning the ashes to the hence a knowledge of and interest
in mosquitoes would be an addeap Sir Ruport said that in his lifo his father was a simple man, and Vantage to them, for although theso he desired to remain so in death. creatures. aro not confined to the warmer parts of the earth being found as far north as the Artic gions of Canada and in the neigh Fbourhood of Groenland's iöy moun- nine, yot the diseases which they carry are much more in evidence in
warmer climates,
In under to examine these insects a hand lone is useful for making out certain details. If one ia, not available the top or bottom of the syopices of a moorescope will be helpful, All ordinary microscope
"By his wish," added the son, "I now scatter the ashes of my father" and your friend over the waves of the sea by which he lived so long." Bir John had asked that there should be no coremony
and no mourning, and, only one wreath of violeta from Lady Brickwood was thrown upon the waters.
After the ashes had been scattered the urn was smashed on the stern, of the boat and thrown overboard,
can be adapted for examination preserved and mounted are very parpsies if suitable pins can be had useful as they show almost as many for arranging the specimen, but details as the larvae from whence the best instrument of all is an they originate. The larva, finally Entomological microscope,
becomes a pupa which is shaped like
+
The first step in the examination should be that of ascertaining who
comin-does not eat, but is very active. In due course the pupal ther the subject is really a mosakia aplits and the mosquito quito or not, and you will often morges. The Inrva has a huad, had yourself confronted with entothorax, and abdomen, The head nological specimens which are not. possesses mouth parts, a pair of
Mosquitoes belong to the class Insectu, that is to say they possess a heady thorax, and abdomen; the thorax carries two pairs of wings and three pairs of logs as the hind pair of wings are vestigial club shaped structures and front pair membranous, they belong to the order Diptera.
Iance,
eyes, a pair of satenage and a pair of mouth brushes" which are collections of hairs arranged an each side of the month. Is the can- ibat larvae the mouth brushes are replaced by mouth rakes, the zakes resembling saws.
Two Kinds of Caribal Larvae.
In other tribes (to one of which
"In order to understand certain terms used in mosquitology a brief There are two kinds of cannibal description of the external atrue- larvae on the Island of Hong Kong ture of the insect is desirable. On one belonging to the genus Lutzia, the head are situated a pair of the other to the genus Megarhinus. eyes, large kidney shaped bodies. Neither of these genera appears to From between the eyes arise w pair take much interest in man Моя of jointed appuidugas known as quite larvae have a tracheal system antenhae, the segments carry whorls by means of which they breathe of hair which in the females are air; in one tribe the Anophelinii- sparse and wispy but in the male the two main tracheal trunks are generally thickset or bushy as terminate in spiracles, openings on to present a bottle brush appear the 8th abdominal segment: these The proboscia consists of a la of the water, but so also do the larvae rest parallel to the surface bium or sheath which encloace the larvae of the genus Uranotaenia "piercing and auctorial arrange-which is found in Hong Kong,
ments, and is a hollow cylindrical tube narrowly open along its dorsal the Uranotaenia balongs) the surface and ending distally in two tracheal tubes do not terminate on.. triangular pointed labellas which the 8th segment but are produced serve to guide the lancete.
The piercing and suctorial parts known as
outwards and form" a projection form a double tube when in action rest with their bodies at an angle a syphon. The larvae up one tube goes the blood and any to the surface of the water, hond malarial parasites is may contain down syphon up and thus obtain into the mosquitoes midgut Or
tomach, down the other tube goes larvae, the syphon ia specially air. In another kind of mosquito the mosquitoe's salivary secretions modified, there are hooks at the end Into the wound and any sporozoites of it by which the larvae attaches which may be in the salivary soure- tions.
itself to the roots of aquatic plants from which it obtaing oxygen and. does not come up to the surface of Arising from the bead and flank the water. These larvas can be ob ing the proboscis one on either side tained by pulling up these roota, of it are the palps. These vary in hold and can
Some of the larvae will let go their length and shape according to sox" dipping" in the ordinary way, be captured by and species.
The body of the mosquito is or. All larvae have two pairs of leaf namented with hairs, bristles and
like structures on, the termina) senies of various descriptions. In segment known as anal or tracheal some instance the scales are plain, gille which surround the anal open- in others they are coloured accounting. Most Anopholine larvae have Lag for spotting or marking of the what are known as palmate turfs on wings, banding or spotting of the the abdominal segments and some legs and banding of the abdomen have them on the thorax, In cold -thus helping in the identification climates some mosquitoes hibernate and separation of specios,
throughout the winter, some_of. these insects exist during that time in the larval stage and some even in the egg stage.
Male mosquitoes do not suck bloodi
+
Where Eggs Ara Laid.
Eggs are laid on or near the
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their egge in collections of water in tins, bottles, bath room jars and other domestic utensils. Some, such
Tour Tribes.
The sub family Culicidae be divided into four tribea
as Anopheles lay their eggs usually Anophelini, Culicini, Megalorbini, in natural collections of water at Babethini. the edge of swamps, ponds, running The Sabothină are only of streams, seepages; other mosquitoes academic interest. The Megalorhini select the water in tree holes, are represented here by the species pitcher plants, whilst some favour Megarhinus splendons which has water tainted with sewage effluents already been mentioned. The larvae. The length of the egg is generally are very large and often found in to 1 mm long and is found either tree holes. Specimens obtained in singly or in the form of rafta,October 1930 and kept in the These rafte may consist of thres or laboratory did not become mosqui four hundred og
Some ogg da
tóes until April 1931, but in the those of the Stogomyia caa with warm season such development stand prolonged drying
would take plaon in little oVER BE week. The adults are large mos quitoos, highly ornamented their
The larva emerges from the og after a low days it feeds, grows and in the course of development proboscis instead of being straight: throws off skins. The skins who is bent like a hook
Continued on nexe Volumen.}`
(To be Continued.)
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