INSECTS 



The mosquito pupa (Fig. 174 F) also lives in the water, 

 but is quite a different looking creature from the larva. 

 The thorax, the head, the head appendages, the legs, and 

 the wings are all compressed into a large oval mass from 



MxPlp 



Fig. 176. Mouth parts of a female mosquito, Joblotia Jigilala 

 A, the head with the proboscis (Prb) in natural position. B, the 

 mouth parts separated, showing the component pieces of the 



proboscis 

 Ant, antenna; E, compound eye; Hp/iy, hypopharynx; Lb, labium; 

 Lm, labrum; Md, mandibles; Mx, maxillae; MxPlp, Pip, max- 

 illary palpi; Prb, proboscis 



which the slender abdomen hangs downward. The pupa, 

 owing to air sacs in the thorax, is lighter than water and, 

 when quiet, it rises to the surface where it floats with the 

 back of the thorax against the surface film. The pupa has 

 lost the respiratory tube and the posterior spiracles of the 

 larva, but has acquired two large, trumpetlike breathing 

 tubes of its own that arise from the anterior part of the 



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