1920] Du Porte: Muscular System of Gryllus 43 



F. The Ninth Segment. 



LONGITUDINAL MUSCLES. 



(a) Sternal. 



110. The Second Ventral (Fig. 35). A rectus muscle from 

 the anterior lateral angle of the subgenital plate, the ninth 

 sternite, into the ventral edge of the podical plate or tenth 

 tergite. This muscle apparently enlarges the anal opening. 

 Found in the male only. ^ 



(b) Tergal. 



Similar to the eighth segment. 



DORSOVENTRAL MUSCLES. 



(a) Tergo-sternal. 



111. The Indirect Elevator of the Ovipositor (Fig. 34). A 

 straight muscle from the anterior edge of the ninth tergite 

 into the supragenital plate or ninth sternite. 



(b) Noto-gonapophysal. 



112. The Second Depressor of the Ovipositor (Figs. 33 and 

 34), is a strong muscle originating from the entotergite of the 

 ninth segment. It is inserted into (1) the ventral process of the 

 dorsal gonapophysis and (2) the median process of the trans- 

 verse beam connecting the ventral processes of the two dorsal 

 gonapophyses. 



113. The Third Depressor of the Ovipositor (Fig. 33), a 

 stout, conical muscle, also originates from the inner face of the 

 anterior process (entotergite) of the ninth tergite. It lies on 

 the inner side of the second depressor and is inserted into the 

 ventral process of the dorsal gonapophysis. 



114. The First Elevator of the Ovipositor (Figs. 33 and 34), 

 is a short broad muscle originating from the lateral anterior edge 

 of the ninth tergite and inserted into the ventral face of the 

 dorsal process of the dorsal gonapophysis. 



STERNAL MUSCLES. 



(a) Male Genital Muscles. 



115. The Suspensory Muscle of the Spermatophore Cup 

 (Figs. 35 and 36), a short muscle from the latero-anterior angle 

 of the subgenital plate into the ventral valve of the sperma- 

 tophore cup at its junction with the ductus ejaculatorius. 



