MORPHOLOGY OF THE INSECT ABDOMEN 



PART II. THE GENITAL DUCTS AND THE OVIPOSITOR 



By R. E. SNODGRASS 

 Bureau of Entomology, U. S. Department of Agriculture 



CONTENTS 



PAGE 



Introduction i 



I. General structure of the abdomen 3 



II. Morphology of the gonads and the genital ducts 8 



III. The ovipositor of Thysanura 26 



IV. General structure of the pterygote ovipositor and associated organs.. 32 



The genital invaginations 32 



The genital chamber and the vestibulum 35 



The ovipositor ^j 



Definitions 45 



V. The ovipositor of Orthoptera 47 



Gryllus assimilis Fabricius 52 



Blatta orientalis Linnaeus 71 



VI. The ovipositor of Hemiptera 79 



Pentacora ligata Say '61 



Anasa tristis (DeGeer) 84 



Amblydisca gigas Fowler 86 



Magicicada scptendecim (Linnaeus) 91 



VII. The ovipositor of Hymenoptera 105 



Pteronidea ribesii (Scopoli) 106 



Atanyeohis rugosiventris (Ashmead) no 



Megarhyssa atrata (Fabricius) 112 



Apis mellifica Linnaeus 114 



Abbreviations used on the figures 142 



References 144 



INTRODUCTION 



Mythologies usually begin with the bringing of order out of chaos. 

 From this, how^ever, it should not be hastily concluded that the results 

 of all attempts to establish order where confusion has prevailed belong 

 to the realm of mythology, even though they may deal with things by 

 their nature unknowable. Particularly, the writer hopes, at least, that 

 there may be seen some ground of plausibility in the scheme set forth 

 in this paper, and in others of the same series that have preceded it, 



Smithsonian Miscellaneous Collections, Vol. 89, No. 8 



