K.Selander, 1952 6 Camphylhyneus hirundis Aug. 26 Pie de la cuesta, 20 ft., Guerrero, Mexico. component of their niche. Songs are occasionally heard singing, yet the young seem to have left the nests. Perhaps some adults are still nesting - yet gonads of specimens were not greatly enlarged. Song is quite melodious - tick - a low - tuck - a low - tuck - a - low - after lasting several seconds (up to about 10 seconds at most) and often rising and falling thusly invariably preceded by chatter. Observed an adult carrying an insect larva in its bill - apparently some feeding of the young even though they are out of the nest. As to habitat occurrence - the birds prefer rather thick vegetation. Like fence rows where there are trees (about 20 feet tall) covered with vines, (have photographs) but also found in rather open trees in pasture. Become silent around 10:00 in the morning and are difficult to locate. Will respond well to squeaks most of the time, however, manner of foraging very similar to that of C.ruficauda, in that the birds frequent the lower middle portions of trees - and spend much time walking along branches. Do not occur in fine stemmed vegetation but seem to require branches of some size. Do not find them on the ground after although I noted them descend to herbaceous vegetation about the trunk of a tree. Also, not often found high