64 STUDIES OF ANIMAL TYPES 



larva. Do the pupae seem to take food ? As a matter of 

 fact, they do not. Note the exact time it took a larva to 

 transform to a pupa. 



Make a drawing. of a pupa. 



B. STUDY OF ADULT CULEX. As soon as pupae are noted, 

 the top of the jar should be covered with mosquito netting 

 to prevent the escape of the adults. Note the time the pupae 

 exist before transforming to adults. Catch as many adults 

 as possible in cyanide bottles, mount them very carefully 

 on the points of small pins by sticking them into the under 

 side of the thorax. In this way the insects may be handled 

 without fear of ruining them. With the hand lens, note 

 the compound eyes. Note the two antennae. Examine 

 several specimens and determine whether there is any 

 difference in the antennae of different individuals. The 

 males have antennae bearing very many long hairs, while 

 the females have antennae bearing few short hairs. In 

 addition to the antennae, the head of the male bears two 

 long, jointed, and hairy appendages termed the palpi. 

 The hairy palpi and antennae give the head of the male a 

 characteristic appearance, which at once distinguishes this 

 sex from the female. Examine several specimens until 

 there is no difficulty in telling one sex from the other. 

 The male does not bite. Note the single prominent pro- 

 jection from the head of the female. This is the proboscis. 

 Note that there are two very short projections on the 

 head at the base of the proboscis. These are the palpi. 



How many wings has an adult mosquito ? How does the 

 number compare with that of the butterfly? Note the 

 pair of knobbed threads borne by the metathorax in place 

 of the second pair of wings borne by locusts and butterflies. 

 Mount a wing in water on a slide. Note the longitudinal 



