42 Annals Entomological Society of America [Vol. XIII^ 



D. The Seventh Abdominal Segment of the Female. 



LONGITUDINAL MUSCLES. 



Sternal. 



106. The Retractor of the Vagina (Fig. 33) is a flat parallel- 

 fibred muscle originating from the antero-lateral angle of the 

 seventh sternite and inserted into the dorsal side of the vagina 

 at its junction with the oviduct. A suspensor and retractor 

 of the vagina. The muscle probably helps to force the egg out 

 by elongating the vagina, thus reducing its lumen and exerting 

 pressure on the egg. 



107. The Adductor of the Subgenital Plate (Figs. 33 and 34).. 

 A rectus muscle having its origin adjacent to and immediately 

 in front of 106. It is inserted into the lateral end of the anterior 

 border of the eighth sternite or subgenital plate. Homologous 

 with the second sternals. 



The other muscles are similar to those of the preceding, 

 segments. 



E. The Eighth Segment in the Female. 



LONGITUDINAL MUSCLES. 



(Fig. 34.) 



There are no longitudinal muscles in the eighth sternites. 

 The tergal muscles occupy the entire tergum except the median 

 line, and all extend from the anterior to the posterior border, 

 showing no differentiation between the first and second dorsals.. 



DORSOVENTRAL MUSCLES. 



(a) Tergo-sternal. 



108. The Abductor of the Subgenital Plate (Fig. 34) originates: 

 from the lateral end of the anterior process of the eighth tergite, 

 runs obliquely ventrad, and is inserted into the antero-lateral 

 angle of the subgenital plate. 



(b) Noto-gonapophysal. 



109. The First Depressor of the Ovipositor (Fig. 33) is a 

 large, strong, conical muscle originating from the inner face of 

 the anterior process of the eighth tergite and running obliquely 

 ventrad to be inserted into the ventral process of the ventral 

 gonapophysis. 



