328 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Oct. 2 70 90 65 



3 70 88 71 



4 100 78 58 



5 150 84 CO 



6 120 83 62 



7 54 63 '51 



8 150 65 48 



9 105 61 50 



10 60 69 43 



11 40 81 54 



14 108 85 57 



16 40 77 46 



17 56 71 43 



18 22 73 45 



20 4 55 40 



23 25 68 30 



24 5 69 37 



25 12 67 45 



26 12 73 36 



30 2 53 34 



February 15, 1912, Rosedale, Kan. — Full-grown Simulium 

 vittatum larvae covered the under sides of the rocks in the 

 ripples in Turkey creek where it enters the city. 



June 7, 1912, Rosedale, Kan. — Simulium larvae were less 

 numerous and smaller than those observed February 15. This 

 is a good evidence that a brood must have come off early in 

 the spring, leaving these stragglers to emerge later. Some of 

 these later larvae I placed in a ripple in the laboratory at 

 Kansas University, getting them to pupate and emerge later. 

 From a few pupa? that I brought to the laboratory at that time 

 eight flies emerged on June 8. From the larvae that pupated 

 in the laboratory twenty-four flies emerged June 19. 



Of the midsummer S. vittatum brood that emerged from a 



small stream on the University campus the following dates 



and number of flies taken were accounted for: 



Jul. 13 40 flies. 



16 15 " 



21 2 " 



. 22 1 " 



25 3 " 



27 3 " 



28 5 " 



29 4 " 



Aug. 4 2 " 



5 2 " 



7 2 " 



Observations on Simulium could not be carried through the 

 summer at Rosedale nor at Oswego because the streams at 

 those places dried up during the drouth, and as a consequence 

 the Simulium there ceased to propagate themselves. 



