Fig. 4

Heads (lateral view) of southern-Andean and northern-Andean Rhodnius ecuadoriensis: typical bugs primarily from vertebrate tree-nests (Loja) vs atypical bugs primarily from Andean Phytelephas aequatorialis palms (Tsáchilas). Note the striking divergence, which clearly falls within the range of what are normally considered interspecies differences in the Triatominae [1]. Drawings by FA-F