3 8 MALARIA 



into the oesophagus through the salivary receptacle 

 close to the base of the proboscis. 



The reproductive system of the female mosquito 

 occupies the posterior portion of the abdomen and 

 comprises a pair of ovaries joined by a pair of oviducts 

 terminating in the vagina and ovipositors ; one to three 

 (depending on the species) spermathecae are also pres- 



Fig. 15. Internal anatomy, in part, of a mosquito, a, head; b, thorax; c, abdomen ; 

 ant., antenna; pip., palpus; prb., proboscis; br., brain; sbbt., subcesophageal ganglion; 

 rich., ventral nerve chord ; ph., pharynx; ces., oesophagus; res., food reservoir (caecum), of 

 which there are three; prov., proventriculus ; St., stomach or mid-gut; il., ileum; col., 

 colon; red., rectum; mpgt., malpighian tubules; sal., salivary gland; salrsvr., salivary 

 reservoir; said., salivary duct. (As suggested by various authors.) 



ent. The spermathecse of an impregnated female 

 contain myriads of spermatozoa, and the ovaries when 

 mature occupy the larger part of the abdomen. 



Life History of Mosquitoes. — A general statement 

 of life history as found in mosquitoes is not possible if 

 the time for the transformation is desired, because 

 this factor varies considerably for the genera and even 



