OVIPOSITOR 



51 



equals the abdomen in length. It is composed of segments vi, \ii, 

 viii, and ix, each being separated from the adjacent segments l>v 

 an extensible intersegmental UHiabrane, which is covered with 

 fine spines. When the ovipositor is retracted (fig. 20, ovp.) it lies 



.y.d 



VIII.K 



su.p.(\K.d.) 



.V\d 



Fig. 22. Abdomen of female showing the extended ovipositor. 



V, d. to ix, d. Fifth to ninth dorsal arches or plates of the abdomen. v, v. to 



viii, r. Fifth to eighth ventral plates or arches. .sii.p. The suranal plate 



(ninth dorsal arch). 



The anus is situated between the two lateral terminal tubercles. 

 in the interior of the posterior end of the abdomen, the segments 

 being telescoped the one within the other, so that only the terminal 

 tubercles are visible from the exterior. The dorsal arch of the 

 sixth abdominal segment is reduced to a A-shaped sclerite (vi, d) 

 lying on the dorsal side of the segment. The ventral arch of this 



4—2 



