CLOVER AND ALFALFA SEED OHALCTS-FLY. 



11 



LATE APPEARANCE OF ADULTS. 



While some of the larvae apparently go into hibernation as early 

 as August, adults may be seen emerging from the infested seeds and 

 seed pods in the months of October and November. 



At Glendale, Calif., adults were still active in the fields as late as 

 November 18, in 1912. C. N. Ainslie reported B. funehrls ae being 

 numerous among the florets of red clover on September 17, in 1913, 

 at Fairmont, Minn. At Albany, Oreg., the writer found them active 

 over red clover on September 15, in 1914. At Nephi, Utah, they were 

 active on alfalfa florets on September 24 of the same year. Activity 

 of the adults, oviposition, and development of larvae usually continue 

 as long as green seed pods are present in the fields. The first heavy 

 frost kills the adults and pupse and most of the undeveloped larvae. 



The writer's observations show that in southwestern Arizona this 

 species may have as many as four generations in a single season. 

 This is, of course, under favorable conditions — first on volunteer 

 alfalfa and then in the irrigated seed fields. Without doubt it com- 

 pletes at least two generations in most of the intermountain seed- 

 growing districts, where tlie growing seasons are frequently very 

 short. The minimum number of generations in a single season may 

 be less than one under very unfavorable conditions, as it required 

 more than one season for some of the individuals under observation 

 to reach the adult stage. 



Table II. 



-Length of the pupal period for 50 individuals of Bruchophagus fune- 

 hris which hibernated in the larval stage. » 



Pupal jKjriod of male. 



Days. 



Mar. 10 to Apr. 14 35 



Mar. 11 to Apr. 22 42 



Mar. 10 to Apr. 21 42 



Feb. 19 to Apr. 12 52 



Mar. 10 to Apr. 22 33 



Mar. 14 to Apr. 23 



Mar. 17 to Apr. 16 30 



Mar. 11 to Apr. 2 22 



Mar. 11 to Apr. 4 24 



Mar. 14 to Apr. 6 23 



Mar. 14 to Apr. 10 27 



Mar. 14 to Apr. 11 28 



Mar. 23 to Apr. 25 23 



Mar. 18 to Apr. 19 32 



Mar. 11 to Apr. 1 21 



Mar. 11 to Apr. 4 24 



Mar. 11 to Apr. 4 24 



Mar. 3 f> to Apr. 13 28 



Mar. 14 to Apr. 4 21 



Mar. 17 to Apr. 15 29 



Mar. 13to Apr. 10 28 



Mar. 18to Apr. 14 27 



Mar. 11 to Apr. 2 22 



Mar. 11 to Apr. 6 26 



Mar. llto Apr. 2 22 



Average 28.3 



Pupal period of female. 



Days. 



Mar. 10 to Apr. 22 43 



Mar. 10 to Apr. 14 35 



Mar. llto Apr. 14 34 



Mar. 10 to Apr. 22 43 



Mar. 11 to Apr. 22 42 



Mar. 11 to Apr. 21 4l 



Mar. 20 to Apr. 28 39 



Mar. llto Apr. 14 34 



Mar. 21 to Apr. 24 34 



Mar. 10 to Apr. 14 35 



Mar. 17 to Apr. 22 36 



Mar. lOto Apr. 14 35 



Mar. lOto Apr. 14 35 



Mar. 10 to Apr. 22 43 



Mar. 14 to Apr. 13 30 



Mar. 16 to Apr. 13 28 



Mar. 18 to Apr. 18 31 



Mar. 18 to Apr. 19 32 



Mar. 12to Apr. 21 40 



Mar. 11 to Apr. 6 26 



Mar. 14to Apr. 11 28 



Mar. 14to Apr. 15 32 



Mar. 14to Apr. 11 28 



Mar. 13 to Apr. 15 33 



Mar. 11 to Apr. 6 26 



Average 34. 5 



