Packard.] 



394 



[February 26, 



oblong-oval inform. These tubercles (Fig. 1, a) are the rudiments of 

 the first pair of rhabdites. Just in front of the base of the ninth seg- 

 ment arise two pairs of tubercles, whose development is farther ad- 

 vanced than that of the first pair of rhabdites. The second or outer 

 pair (c) are long and slender, and curved at right angles, so that their 

 tips are placed in front of those of the third pair (b). These are tri- 

 angular, with their bases nearly touching on the mesial line. Be- 

 tween the ends of the third pair is the external opening of the oviduct. 



In a succeeding stage (Fig. 2), when the changes to the pupa state 

 have begun, the first pair of rhabdites increase in length, but still 

 retain their former position. The two other pairs lengthen out, 

 especially the inner or third jjair, while the outer pair are less curved. 



In a fixrther advanced stage (Fig. 3) of the semi-pupa, the greatest 

 change has occurred in the first pair of rhabdites which have greatly 

 increased in length (the development of the others 

 having remained more stationary), and now closely 

 meet over the mesial line of the body, while their 

 ends are pointed outwards nearly at right angles 

 to their basal two-thirds. The insertion of the 

 third pair (i) seems now to be set back, the first 

 No. 3. and third appearing as if arising from the eighth 



abdominal segment, as we incorrectly stated they were in these Pro- 

 ceedings, Vol. X, p. 281. 



In tiie next stage (Fig. 4, front and side view), the eighth urite, or 

 sternite, has been drawn within the abdominal cavity, and there 

 become greatly aborted so 

 that the three rhabdites 

 appear as if they all took 

 their origin from the ninth 

 ring, as supposed by La- 

 caze-Duthiers, in his elab- 

 orate work on the Fe- 

 male Genital Armor. The 

 eighth pleurites and ter- ^^S- *• 



gum, however, still appear. The ninth are partially aborted, the 

 tergal and pleural portions of the arthromere having, when seen from 

 below, disappeared, the ovipositor resting upon the sternite. The 

 tergal portion is much smaller, and seen from above is partially re- 

 tracted beneath the eighth tergite. The seventh and tenth arthro- 

 meres are unchanged, the latter being, however, a little smaller. 



Tlie first pair of rhabdites (or octo-rhabdites) still diverge at their 

 tips, which reach to the outer tliird of the two other pairs. The ends 

 of the second pair rest on the base of the tenth segment. In a 

 lateral view (Fig. 4), the relation of the parts is better seen. The 



