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(25) [[underlined]] Diglossa, [[/underlined]] May 26, 1960, II. [[blue marking]] to sing loudly when we moved about conspicuously near them. The songs, in other words, may be used as a potential predator reaction. [[/blue marking]] [[pink and blue marking]] In case I have not made it completely clear in the preceding pages, I must stress that the [[male symbol]]'s and [[female symbol]]'s of both the small black and the blue-spotted species seem to keep almost completely apart. They must come together for copulations; but we have very seldom seen a [[male symbol]] and [[female symbol]] together except when both were feeding on the same flowers. Such "feeding associations" seem to be essentially casual. The rarity or absence of close "pair" associations between [[male symbol]] and [[female symbol]] Diglossas is another feature in which they resemble hummingbirds. [[/pink and blue marking]] [[green marking]] We may have caught a brief glimpse, this morning, of a large bright blue Diglossa-type bird (which I definitely saw last year – without being able to study its behavior. I think that we may have heard it sing this morning – although I couldn't actually see the bird when the singing occurred. (I shall mark this species [[green marking]]. It might be [[underlined]] indigotica [[/underlined]] (see notes of July 29, 1960.) The song we heard was as follows: "Da Zee Zee Zee Zee" More reminiscent of [[underlined]] baritula [[/underlined]] than of either the small black or the blue-spotted species. [[/green marking]] [[pink, blue and black marking]] After hearing the song of one of the local species of Cone-bills (see today's notes on [[underlined]] Conirostrum, [[/underlined]] I am more than ever convinced that Diglossa is most closely related to the Bananaquit-Conebill group of warblers. [[/pink, blue and black marking]] Cerro Pichincha This afternoon we made some more observations of the small black species, in the usual place.