/ 



472 



spermatheca in no way influenced ovipositional behavior.. In females whose 

 spermathecal muscles had been severed, 22 percent sperm displacement occurred 

 after a second mating compared with 66 percent for normal females. The physi- 

 cal displacement of sperm was thus largely dependent on a functional spermathecal 

 muscle. 



931. . 1975. The role of the spermathecal gland of the boll weevil, 

 Anthonomus grandis . J. Insect Physiol. 21: 1457-1462. 



Spermatozoa were relatively inactive and did not enter the spermatheca of fe- 

 male boll weevils, Anthonomus grandis , whose spermathecal glands were removed 

 as teneral adults. However, these females were able to lay fertile eggs for 

 a 2 week, period. When the spermathecal gland was removed from older females, 

 spermathecal filling occurred, and although the spermatozoa retained their 

 fertilizing capacity for extended periods, spermathecal emptying did not occur. 

 Spermatozoa gradually lost their motility and fertilizing capacity, indicating 

 that spermathecal secretions are effective in very small amounts. Spermatozoa 

 were not activated by any of the materials contained in the normal male ejacu- 

 late. These materials alone did not effect spermathecal filling nor were they 

 capable of maintaining the fertilizing capacity of the spermatozoa for very 

 long. Sperm economy is low with less than 1 fertile egg laid per 100 sperma- 

 tozoa used. 



932. . 1976. Dark-scale: a recessive sex-linked mutant of the boll weevil. 

 J. Hered. 67: 85-86. 



A new mutant of the boll weevil is described. This mutant, designated dark- 

 scale, is a sex-linked recessive carried on the X chromosome that affects 

 colo^^tion of the scales on the dorsal surface of the body (elytra and pro- 

 notum) . Dark-scaled weevils are easily distinguishable with the naked eye 

 from wild-type, light-scaled weevils. Crosses between dark-scaled females 



