1868.] 



395 



[Packard. 



Fig. 5. 



ovipositor, as tlie three pairs of rhabdites taken collectively may 

 now be called, appears as if appended to the ninth urite. 



In a succeeding stage (Fig. 5), the six rhabdites are very equal in 

 size. The first pair diverge 

 from their base, and, as seen 

 in the side view, are laid over 

 on each side of the other two 

 and thus form a sort of sheath 

 for the other two pairs. The 

 second pair is the larger of 

 the two, the true sting being 

 formed by the union of the 

 innermost and slenderer pair. 



After this the three pairs unite more closely, and are retracted 

 gradually within the abdominal cavity (See these Proceedings, Vol. 

 X., p. 295, figs. 3 and 4) until in the mature pupa they are entirely 

 concealed. 



Tlie corresponding parts in the male (Fig. 6, B. vagans) consist of 

 three pairs of tubercle-like outgrowths fi'om the urites of the ninth 

 ring. There are two very unequal pairs of fleshy tubercles situated 

 parallel to each other on the hind edge of the ninth ring. The outer 

 pair (s) are large and rudely conical. The 

 inner jjair (y) are linear oval, and arranged 

 antero-posteriorly upon the mesial line of the 

 body. Immediately in front is the anterior j^air 

 of tubercles (.r) , which are a little shorter and 

 broader than the mesial pair, but which together 

 form an inverted A, of which the apex rests 

 '^' ■ oyer the suture, between the eighth and ninth 



rings, while the posterior ends diverge outwards, abutting upon the 

 external pair of tubercles. Upon looking at these parts in the pupa, 

 the tubercles exposed in the semi-pupa are seen to be merely the 

 extremities of much longer parts which are concealed beneath the 

 crust in that stage. Whether these parts are present in the larva, as 

 the homologous parts are in the female, as is most probable, I have not 

 specimens of male larvfe to enable me to decide. All the parts taken 

 together are situated in a triangular area. The lining of the termin- 

 ation of the intestine, which is drawn out when the larva skin is 

 removed, shows the position of the anal orifice in relation to the 

 genital armor. It opens just above the inner pair of linear tubercles. 

 The genital armor of the male jiujja in the natural position appears, 

 when seen from beneath, as two pau-s of tubercles, situated between 

 the last abdominal ring and the eighth urite, occupying a transversely 



