VIII, B, 1 Mitzmain: Stomoxys calcitrans Linnaeus 41 



Table III. — Showing the feeding of Stomoxys on various animals. 



Date. 



October 16.. _ 

 October 17... 

 October 18... 

 October 19... 

 October 20... 

 October 21... 

 October 22... 

 October 23... 

 October 24... 

 October 25. . . 

 October 26... 

 October 27... 

 October 28... 

 October 29... 

 October 30... 

 October 31... i 

 November 1.. 



Animal used. 



Number of 

 flies fed 



Horse ... 

 Monkey.. 

 Carabao 

 Bullock.. 

 Goat 



Sheep 



Guinea pig , 



Pig - 



Cat 



Deer 



Dog.. 



Rabbit 



Chicken 



Bat 



Rat 



Lizard (gecko) 

 Man (Filipino). 



Length of 

 time fed 

 (average 

 per fly). 



Min. 

 3.5 

 4.0 

 3.0 

 4.0 

 2.5 

 3.5 

 3.5 

 2.5 

 4.5 

 2.0 

 3.0 

 2.5 

 2.5 

 2.5 

 4.5 

 8.5 

 3.0 



The table shows that at least 4 of the flies fed on 17 species of 

 animals in as many days. 



The only fact of practical value suggested by these experiments 

 is that Stomoxys calcitrans will accept any host which will submit 

 to its attacks. Therefore, a sick animal would be most exposed 

 to the bites of Stomoxys or other insects of similar habits. The 

 inference to be drawn relative to epidemiology is obvious. 



THE FEEDING RELATION OF NONBITING FLIES TO STOMOXYS 



A peculiar feeding relation has been observed to exist between 

 Stomoxys and certain nonbiting flies. I was curious to learn 

 why such large numbers of nonbiting flies were generally found 

 in collecting insects from domesticated animals. Moreover, in 

 an examination of extensive collections made with a net swung 

 over the backs of the animals, the majority of the nonbiting flies 

 were found to have blood-engorged abdomens. When these were 

 dissected and examined microscopically, mammalian blood was 

 found to be the principal food constituent. 



A quiet bullock was selected for closer observation. On this 

 animal some 150 to 200 flies, mostly muscids, were seen. Many 

 hundred dung flies, including house flies, were scattered about on 

 the floor of the stall, and occasionally one of these joined the 

 blood-sucking flies on the body of the bullock. 



