121 



disseminated by mosquitoes, and it has not yet been proved 

 that any of these diseases can be communicated to human 

 beings in any way except through the agency of tli< -s< 



insects. 



In the West Indies, the filarial parasite, which produces 

 a disease called fever and ague, often resulting in those 

 deformities known as Barbados Leg, or elephantiasis, is 

 transmitted by mosquitoes of the genus Culex. In other 

 parts of the world other species are transmitters of this 

 disease. Malaria is transmitted by mosquitoes of the genus 

 Anopheles, and yellow fever by Stegomyia fasciata, Fabr. 

 (Fig. 135). These mosquitoes all have a general distribution 

 t hrougbout the West Indies, with t he exception of Anopheles, 

 which is not known to occur in Barbados. 



So far as is known at present, mosquitoes are able to 



breed only in stagnant or slowly running water, on the surface 



of which the eggs (Fig. 136) are laid. The Larvae Live in the 



water as wrigglers or ' water-worms . and the pupae, which 



differ slightly in appearance from the larvae, are also found 



Fig - . 136. Mosquitoes. 



Egg mass above, ivith enlarged eggs "f left. Young larvat below 



Enlarged. (From U. S. Dept. Agric.) 



