An annual cycle of collections of mosquitoes carried out in three locations of the Coastal Region and Slopes of Santa Catarina, with one collector (trap man) in the woods, another in the nearest house and a third placed between these two points, provided the following Information: 1) Anophieles bellator which is a rare mosquito in the thick woods on the slopes, becomes abundant when these forests are damaged by the removal of trees; 2) As many of this species as of A. cruzii and A. homunculus appeared in greater numbers in the collections made in the open country; 3) Except for the fact that A. homunculus looks for food in the later hours of the night no significant difference was noted in the behaviour of these three species of Anophelines; 4) A comparison of the data obtained with that of other authors, showed that a person placed outside the house intercepts a significant number of mosquitoes; 5) It was clear that anophelines in the region rarely alight on sprayed walls; 6) Besides this, DDT greatly reduces the number of specimens which go to feed inside the houses; for A. cruzii this reduction was of the order of 90%.