Fig. 1

Ingestion of artificial sugar meals by 1st instar nymphs of Rhodnius prolixus. Animals were exposed to cotton wool soaked with bromophenol blue solution (1 % w/v) plus sucrose 10 % (w/v) (a and c, experimental) or bromophenol blue solution (1 % in water) (b and d, controls). Photos are representative insects or guts from groups of 20 insects. The experiment was repeated three times. a and b, whole insects. c and d, dissected guts. The dotted line shows the limits of the anterior midgut