Smithsonian Report, 1951. — Wigglesworth 



PLATE 4 



Figure 1. — Young larva of Triatoma 

 (above) decapitated 24 hours after 

 feeding and caused to molt by joining 

 it to a Sth-stage larva of Rhodnius de- 

 capitated 10 days after feeding. X 3. 



Figure 2. — Rhoai.ui. \\ iiu i...a:a>-!L;i .:. 

 termediate between larva and adult 

 produced by implanting corpus allatum 

 of young larva into abdomen of Sth- 

 stage larva (cf. pi. 2, fig. 3). X 2.5. 



fei< ~ "-^^^^^^^^^9 



Figure 3. — Cuticle of abdomen of an adult Rhodmus v\hicli had been treated during the 

 5th stage like the insects shown in plate 2, figure 3, and figure 2 above. It has turned 

 into a normal adult, but there is a tiny patch of cuticle of larval type, less than 1 mm. 

 in diameter, overlying the site of implantation of the corpus allatum. X 70. 



