8 Bulletin of the Brooklyn Entomological Society Vol. XVI 



those morphological units comprising the male genitalia of adult 

 Lepidoptera. The male genitalia of the family Hepialidse have 

 proved most helpful in accomplishing this because they have re- 

 tained the primitive relation of the somites and their respective 

 appendages. The absence of a true ^doeagus, the various modi- 

 fications of somite lo and appendage III to function as an intro- 

 mittent organ, the association of the Harpes (App. I) with 

 sternum 9 and the retention of the eighth abdominal spirade are 

 the most striking features in the morphology of the male genitalia 

 of this family. 



Acknowledgments. 



The author desires to thank Drs. J. Chester Bradley and Wm. 

 T. M. Forbes for the loan of specimens from the Cornell Uni- 

 versity collection, Mr. Geo. P. Engelhardt for specimens of H. 

 gracilis and Dr. Forbes and Mr. Carl Heinrich for their generous 

 assistance in homologizing the parts of the male genitalia. 



EXPANATION OF PlATE. 



Abbreviations. 



S7 — Sternum 7. App III — Appendage of Somite 10. 



S8 — Sternum 8. Sio — Sternum 10. 



V — Vinculum. Tio — Tergum 10. 



Sp — Spiracle of Somite 8. D.E. — Opening of Ductus Ejacu- 



Con — Conjunctiva. latorius. 



Sg — Sternum 9. P — Chitinous Process. 



T.R. — Tegumenal Ring. T9 — Tergum 9. 



Sc — Sacculus of Harpe. A — Anus. 



Figures. 



Fig. I. Male Genitalia of Hepialus lupulinus L., ventral aspect; parts 

 spread and labeled. 



Fig. 2. Hepialus lupulinus L. 

 Fig. 3. Sthenopis humuli. 

 Fig. 4. Gorgopis sp. 

 Fig. S. Pielus labyrinthicus. 



