FIGURE 1. Probable transmission mechanism of cimicid bugs among birds' nests from Argentina. a, birds that nidificate inside stick nests of Furnariidae and superimposed nests (s); b, birds that nidificate in more than one kind of nests; c, cavitynesting birds on trees; d, stick nests of Psittacidae (Myiopsitta monachus) and superimposed nests (s); e, cavity-nesting birds in earth. Color inside frames of birds' names: brown, hosts of Acanthocrios furnarii; pale green and pale violet, primary builders; pale yellow color, inquilines; orange, hosts and/or places of O. toledoi; light blue, host of Cyanolicimex patagonicus; dark pink, host of Ornithocoris pallidus; light green, hosts of Psitticimex uritui. All relationships among birds (arrows) were extracted from ornithological literature, as well as intraspecific brood parasitism (curved arrows), except some records given in the Appendix. Places of inquiline nests where they were found infested with cimicid bugs are signaled with tick arrows. A list of birds that nidificate in nest boxes was extracted from De la Peña (2005). See explanation in Discussion.