island from the continent of South America, and this Ordinance 
ensures their speedy destruction. It also provides for the control- 
ing ofany outbreaks of local species. 
The Ordinance in connection with Atta cephalotes, or « Parasol 
Ants» as they are called locally, has already been referred to. 
Another Ordinance prohibits absolutely the importation of the 
Mongoose, and Wild Birds are protected by law. 
Insects in relation to disease. 
In connection with this branch of entomology Mosquitoes were 
studied. They may conveniently be divided into two groups : 
town Mosquitoes and field Mosquitoes. The two Mosquitoes 
always found in towns are Stegomyia calopus and Culex fatigans. 
Occasionally a large specimen of Megarhinus trinidadensis makes 
its appearance in a house and occasions some consternation by its 
size. But these Mosquitoes do not bite or suck blood, and in their 
larval stage do good by devouring Culex and Stegomyia larve. 
There was a time when it was not possible to be in peace in Port 
of Spain on account of the attacks of Stegomyia calopus during the 
day and Culex fatigans at night. Through the introduction of regu- 
lations making it an offence against the law to have larva in any 
water receptacles about houses and the energy and tact of the 
Medical Officer of Health, Dr. J. E. DICKSON, it has been possible 
to materially reduce the number of Mosquitoes in Port of Spain 
and to-day in many parts of the town S/egomyia is rarely seen, 
and Culex fatigans rarely felt at night. This work of destruction 
has also been much helped by the excellent system of drainage 
of the town. No Anopheles are found in the town proper. In 
country districts control work is not possible with such good 
results, but the country people are getting to appreciate the 
benefit of keeping away Mosquitoes and use nets more freely 
than before. They also know the value of the little fish Gzrar- 
dinus guppyt in keeping down larve in water barrels about 
houses. In country districts in places surrounded by many trees 
with bromeliæ growing on them Mosquitoes are plentiful and 
more troublesome during the day than at night. The species occur- 
ing in such localities and biting only during the day are Zema- 
gogus several species, Sabethoides, Stegomyia sexlineata, Wyeo- 
myia longirostris, this last species being particularly trouble- 
