230 JOSE F. NONIDEZ. 



the micropyle cone directed toward the opening of the ventral 

 receptacle. The appendages of the egg remain within the oviduct 

 thus preventing the entrance of spermatozoa into this organ. 

 Fertilization of the eggs takes place in the uterus. 



6. The observation of the extirpated internal genitalia in fer- 

 tilized flies which had been laying eggs for several days and some 

 experiments show that in all probability the first spermatozoa 

 used in fertilization are those stored in the ventral receptacle, 

 while the spermatozoa kept in the spermathecae are used later. 



7. The influence of the secretion of the parovaria on the sper- 

 matozoa and the behavior of the latter when in the vicinity of 

 the egg could not be ascertained on account of the injurious 

 effects of the fluids in which these experiments were carried, on 

 the spermatozoa, which are very sensitive to fluids foreign to 



the body. 



LITERATURE CITED. 

 Berlese, A. 



'09 Gli Insetti. Vol. i, Embriologia e Morfologia. Milano. 

 Hyde, R. R. 



'14 Fertility and Sterility in Drosophila ampelophila. I. Sterility in Dro- 

 sophila with Special Reference to a Defect in the Female and its Beha- 

 vior in Heredity. Journ. Exp. Zool., Vol. 17. 

 Koltzoff, N. K. 



'08 Studien iiber die Gestalt der Zelle. II. Untersuchungen iiber das 

 Kopfskelett des tierischen Spermiums. Arch. f. Zellfors., Bd. 2, H. i. 

 Lowne, B. T. 



'93 The Anatomy, Physiology, Morphology and Development of the Blow- 

 fly (Calliphora erythrocephala). London. 

 Sturtevant, A. H. 



'15 Experiments on Sex Recognition and the Problem of Sexual Selection 

 in Drosophila. Journ. Anim. Behav., Vol. 5, No. 5. 



