22 



or males and females and the ratios were 20T:1N or 100T:1N, hatch was reduced. 

 However, groups of treated females only had no effect on hatch at any ratio 

 of treated to normal weevils. In a 35-day test, 4 weekly releases of irra- 

 diated weevils to maintain a cage population ratio of lOOTrlN caused a 

 reduction in hatch ranging between 70 and 90%. 



37. . 1968. Genetic markers in the boll weevil. J. Hered. 58: 158-163. 



Four new mutations for the boll weevil, Anthonomus grandis , are described. Two, 

 slate (s) and ebony (.e) , are body color genes exhibiting semidominant autosomal 

 inheritance. Both of these genes, in the homozygous state, produce black body 

 color. In the heterozygous state, ebony produces a bronze color, and slate 

 produces a dark red color compared to the red wild-type color. Two are reces- 

 sive autosomal eye color genes. Pearl (2) produces a white spectacled appearance 

 of the eyes. The second eye color mutation produces yellow eyes and is called 

 yellow (2) • Linkage relationships of these genes are at present unoetermined. 

 Genetic markers such as those described in this paper should be of value in 

 entomological research. Such mutants meet most of the conditions required of 

 marking methods. Searches for mutants in other insect species should be made 

 for use both as biological markers and for use in biological control. 



38. ; Hooker, P. A.; and Hardee, D. D. 1968. Behavior of irradiated boll 

 weevils. I. Feeding, attraction, mating, and mortality. J. Econ. Entomol. 

 61: 1677-1680. 



The feeding activity, mating frequency, attraction, sexual response, and mor- 

 tality of normal Anthonomus grandis Boheman were compared with boll weevils 

 irradiated with 6,388 or 12,775 rad of Co^^ gamma radiation. The irradiated 

 weevils equaled normal weevils in each aspect of behavior foi at least 5 days 

 posttreatment. However by the 7th day posttreatraent, all these activities had 

 started to decline in the treated weevils and all irradiated weevils were 



