DEVELOPMENT IN MOSQUITO 155 



dividing into daughter cells (Fig. 43T) from each of which slender 



spindle-shaped bodies project like the " stickers " on a chestnut 



burr (Fig. 43U). Ultimately the cells lose their identity and 



the entire capsule or cyst becomes crammed 



full to the bursting point with myriads of 



these spindle-shaped bodies which have now 



developed into spores (Fig. 43V). Such a 



capsule may contain over 10,000 spores, and 



there may be as many as 500 capsules on a 



single mosquito's stomach (Fig. 46). About ^ 



to A 1 ■ J^i°- '^^- Cross sec- 



i.A days or more, according to temperature, tion of stomach of 

 after the infected blood was swallowed bv the ^""p''** showing 



. , ■' capsules (oocysts) of 



mosquito, the capsule becomes mature and subtertian malaria, 

 bursts, releasing the spores into the body cavity Q^^^^f ^°- ^'^*''^ 

 of the mosquito. From here the httle parasites 

 make their way to the three-lobed salivary gland (Fig. 46, sal. gl.) 

 lying in the fore part of the thorax and connecting with the 

 sucking beak. They assemble in the cells lining the sahvary 



Fig. 46. View of digestive tract of Anopheles, showing spore-filled capsules of 

 malaria parasites on wall of stomach, pal., palpi; prob., proboscis; ant., antennae; 

 ph., pharynx; oes., oesophagus; sal. gl., salivary glands; f. res., ventral food 

 reservoir; d. f. res., dorsal food reservoirs; prov., proventriculus ; St., stomach; 

 malp. tub., malpighian tubules; int., intestine. X 10. 



glands (Fig. 43W) and remain there perhaps for weeks, until the 

 mosquito bites. When this happens the parasites flow with the 

 poisonous saliva into the puncture made by the mosquito and, 

 should the prey of the mosquito be a human being, the whole 



