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Feb., 1921 Bulletin of the Brooklyn Entomological Society 3 



culum of systemlatists, formed by a pocketing in of the caudal 

 margin of this sderite. 



Appendage I: A pair of finger-Hke processes, the Harps of 

 Pierce, associated superficially with the ninth sternum, as in 

 the case of all Lepidoptera, but attached laterally and ventrally 

 to the lateral margin of the eighth sternum, thus showing their 

 relation to it. 



In the systematic terminology of Pierce, the basal inner por- 

 tion of this appendage is termed the Sacculus and the outer free . 

 lobe, the Valva. In the Hepialidse the Harps are so little dif- 

 ferentiated that this terminology is scarcely applicable. The 

 term Claspers has been loosely applied to these appendages 

 but this term should be strictly confined to specialized struc- 

 tures described by Pierce on the inner surface of the Harp. 

 These, as well as other structures belonging to the Jlax^-p.^'Jwhicfe;-^^ 

 are so characteristic of higher Lepidopterous geimalia, do not 

 occur in the Hepialidfe. / MAR 2 9 182'' 



Somite 9: X"\e, .< 



Terguni: Heavily chitinized, deeply emarginate or divided "on 

 the meson and forming the dorsal hood-like portion of the 

 genitalia. This is called the tegumen by Pierce and together 

 with the anastomosed eighth and ninth sterna is referred to as 

 the tegumenal ring. The tegumen and vinculum together with 

 the Gnathos and Uncus are known as the external part of the 

 male genitalia. 



Sternum: A simple chitinized plate situated beneath appendage 

 I but only superficially connected with it. Sternum 9 in the 

 higher Lepidoptera forms the basal portion of the penis and is 

 known as the Anellus while its appendage (Appendage II) 

 together with the appendage of somite 10 (Appendage HI) 

 form; the remainder of the chitinous sheath through which the 

 penis opens and is designated the .-Edoeagus by Pierce. The 

 basal part of the Anellus is often modified into a chitinized 

 spinous or scobinate plate, the Juxta. In the Hepialidse, how- 

 ever, somite 9 possesses no appendage, and the penis, a mem- 

 braneous internal structure passes behind sternum 9 and opens 

 caudad to sternum 10. 



