158 



temperature regimens. None of the temperatures studied resulted in uniform 

 insect development. 



302. Groduer, M. L. 1975. Aberrant spermatogenesis in hybrid progeny of sub- 

 species of the boll weevil Anthonomus grandis Boheinan (Coleoptera: 

 Curcvilionidae) . Int. J. Insect Morphol. Embryol. A: 107-114. 



Reproductive isolation occurs between the boll weevil ( Anthonomus grandis 

 grandis and the thurberia weevil ( Anthonomus grandis thurberia e) . The F- 

 hybrid males from crosses of some populations are unable to produce sperm 

 which are capable of moving to the spermatheca of the female to which they 

 are mated. Electron micrographs reveal a disrupted pattern of spermatogenesis 

 which probably results in structurally abnormal sperm. 



303. . 1979. Fine structure of the spermathecal gland of the cotton boll 

 weevil, Anthonomus grandis , Coleoptera: Curcullonidae. Int. J. Insect 

 Morphol. Embryol. 8: 51-58. 



The secretion of the spermathecal gland, an epidermal derivative, was suggested 

 as the source of nutrients for the sperm which are stored in the spermatheca. 

 This secretion is also necessary for spermathecal filling. The gland consists 

 of 2 types of cells, secretory cells and collecting or ductule cells. The pro- 

 ducts of the secretory cells are deposited in a central cavity lined with micro- 

 villi. The^collecting ductule extends into the central cavity and the secre- 

 tory products move down the ductule into the central lumen of the gland. The 

 contents of the gland are then deposited in the spermatheca. The ductules, ducts 

 and the central lumen of the gland are lined with cuticle, as is the spermatheca. 

 The secretion of the glands from weevils less than 24 h old apparently differs 

 from those of 3 day old weevils. 



