IBS 



investigation of the biology of our mosquito fauna has not left time enough to 

 study the egg-laying processes of A. maculipennis in a more thorough manner. From 

 observations in my hatching cages, but never corroborated in nature, I have got 

 the impression that also the eggs of A. maculipennis are given off if not in rafts, 

 at any rate in series; that periods of egg-laying succeed periods in which eggs are 

 not laid; how many of such periods exist in the life of an A. maculipennis I really 

 do not know. At highest summer temp. I have observed that a blood meal almost 

 disappears from the stomach in the course of about four to six days; when then 

 opened, it has been shown that the abdomen was filled with eggs. I feel quite sure 

 that from the moment of blood-filling and to the moment of egg-ripening the 

 mosquitoes do not leave the stable, but it seems that they suck blood more than 

 once. As mentioned above in my opinion they do not leave the stable except for 

 mating and egg-laying, and it is most probable that, during flight, for one of these 

 two reasons they do not suck blood. If this is right it means that A. maculipennis 

 in most districts of our country does not suck blood out of doors. With regard to 

 larva life I refer to A. bifurcatus. 



10. It is a very peculiar fact that of the owners and inhabitants of about a 

 hundred farms which Mr. Krygkr and I have visited, more than ninety have not 

 had the slightest idea that their stable's contained mosquitoes at all. When we have 

 asked permission to visit their stables they have invariably answered "we have no 

 mosquitoes in our stables"; often the owners have been angry and said that they 

 wanted to see the mosquitoes before they would believe it. It has always been 

 rather a jolly moment when we studied their faces, after having presented them 

 with some hundreds; their astonishment was beyond all bounds. A few of them 

 were well aware that their stables were inhabited by mosquitoes, but these persons 

 have always maintained that the mosquitoes which stung them in the forests and 

 in their gardens were of another kind; that the mosquitoes of the stables were blood- 

 filled they have never observed. 



11. The most striking fact elucidated from conversation with the owners was 

 that the mosquitoes of the stables never sting man. This is in full accordance with 

 my own experience: I have never in my life been stung by a single A. maculipen- 

 nis. Moreover, I have been sitting at the farms near the open stable doors, expect- 

 ing that the mosquitoes would use me as a sucking object. I never succeeded. I 

 have asked the herdsman, who was to attend the sows when they were to farrow 

 and was therefore forced to lie as near as possible to the sow, if he had ever been 

 stung by the mosquitoes. Even if the stables contained many hundreds, the answer 

 was invariably "No". There is not the slightest doubt upon the point that the 

 mosquitoes of the stables suck blood from our farm animals and not from man. 



12. From this common rule we have only been able to get a very few excep- 

 tions. Mr. Kryger has shown that there is evidence that A. maculipennis at all 

 events in two localities in Jutland still attacks man. In one locality the mosquitoes 

 were caught while sucking and determined by him as A. maculipennis; in two other 



