[ 2 ] 
Some larvae can develope in almost any water if provided with pientifu 
ood supply hut these are exceptions. A degree of stagnation or putriditx 
is soon reached with most larvae, and many can only live in water that b 
clear, free from smell and not loaded with vegetable matter. 
Ma ny °f the species have well defined habitats and are only found ii 
t tese. Others, though preferentially with special breeding places, are foun< 
exceptionally or in very small numbers elsewhere. Instances of these wil 
be given as we proceed. 
small numbers 7 th0US '’ " 0t rainless seasons many species are only found i, 
not fmmd he | m 0 ? qmt 0 f %i Wlth selective breeding grounds in nature some an 
not found elsewhere. The reason tor this selectiveness is not apparent, a 
the | d ‘' ‘ e l ; nde a Varl ? US f t,fic,al cond >tions thrive and mature. Most o 
labor??? t 0Und h i n , amboos . and P'tcher plants can be reared in th. 
laboratoty though development is usually slow. 
e-reJv 6 Thf 1 ? tinle ,- e<luired for the development of larva varie 
ova th» H ? great letardmg influence m Europe either in the hatching o 
the’/ f d f pment 0 arv£e or the transmutation of pupa; is cold. YVitl 
t e uniform temperature in this climate this factor mav be ignored am 
u cient suitable food is the most important condition, but any change fron 
he normal habitat appears to cause delay. Larva; which develope "rapid" 
at first m the water in which they were found although supplied with simila 
“ ha - laboratory 
here to’be^ew ? 13 * 311 " 68 affeCtins the transmutation of the pupa appea: 
J h f lon g est period is that taken by the Megarrhines, Toxorhynchite 
are the uTual’periods . 0 ? ^ ° ther mos< l uitoes 2 or '"ore day 
Adult mosquitoes require at the ordinary temperature of the countn 
abundant food supply or die rapidly without depositing eggs, many specie* 
cannot be induced to feed in captivity. 06 ’ y P 
the atr" 0 t Then? P T ta0t fa , Ct ° r W ‘ th some mosquitoes is the humiditv o 
hour or two in ? A JU ? g 6 SpeC,es a ? d "’any of th « aedomyina die in a. 
acres such mosn > a ‘"’°sphere. In well cleared spaces even of a few 
they wm beSd off 63 ^ rar6 ' y f ° Und aS durin S dr ^ periods ‘<-4 
resident? h??? TI?? 3 ' ‘T°?& st men in any operations involving 
rain fad L mohahT? ban gf ls ’"thick jungle where there is a heavv 
a all is probably due to the persistently moist atmosphere in which the 
jungle stream breeding Anopheles Treacheniis found. 
into pe™"m?n r t a !?? e , e<i ' ng P ' aCeS larV8e can be conveniently subdivided 
ext^n^lnThe^ve^?? temporary. The permanent are increased in area and 
when rain ess n?,? a r Jn wh,, . St tbe te mporary become of importance only 
varies wh" The den?ff?? fV °\ ° T 3 period after heavy rains. This 
of the atmosphere ’ " P ° r ° sity of the soil , and the humidity 
character ?— 1 permanent breeding places are streams. These vary 
