PLATE I 
Llewellyn Street drain, near Clifton Road, in the dry season. This drain, being con- 
structed in sand, with no protection against falling in of the sides, allows of the formation 
of suitable puddles for breeding mosquitoes. Anopheles costalis principally breed in this 
drain. Water collects underneath the low bridges crossing the drain, in which many 
mosquitoes are found at the end of the wet season. 
