132 TROPICAL MEDICINE AND HYGIENE 



In the males there are two spicules and three rows of 

 papillae, which are numerous. These worms are parasitic 

 in the body-cavity of various insects and when the full 

 larval development is reached escape and become sexually 

 mature in the non-parasitic state. The embryos enter the 

 insects whilst these are in their larval stage. These worms 

 are not uncommon in the vicinity of houses, and are fre- 

 quently mistaken for filariae, &c. They are found in 

 various regions in the Tropics. They are not parasitic 

 in man, but are so often sent home, sometimes as 

 specimens of Guinea-worms, that they are deserving of 

 mention. 



