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[[circled page number]] 81 [[/circled page number) [[underlined]] ular species. [[/underlined]] One factor which may (or must) contribute to the diffuseness of the flocks here is the absence or rarity of many species of tanagers (e.g.[[underlined]] Cnemoscopus, Hemispingus. [[/underlined]] spp.) Possibly these tanagers (like the commensal [[underlined]] Conirostrum [[/underlined]] spp. -- see today's notes on mixed diglosini) are absent because the native forest has almost disappeared [[margin, in red]] Gen [[/margin]] CORRECTION: I have just been to the airport to check my altimeter. It seems likely that I have [[underlined]] over [[/underlined]] estimated all altitudes recorded so far during this trip (i.e. July 17 and 18) by 300-500 ft. I have now corrected the altimeter-- but [[underlined]] not [[/underlined]] the records in my notes of today and yesterday. [[right aligned]] July 19, 1965 [[/right aligned]] [[right aligned]] Boqueron de Palmitas [[/right aligned]] Arrive area 7750 ft 5:35 am. Just getting light. Area with miscellaneous scrub. Some bird noises. Largely Andean Sparrows. Clear, fairly cool, and windy. Lots of hummingbird sounds 5:43. 5:44. Hear diglossue twitter Many phrases are right after the other. No obvious Intro Notes. Bird singing in small trees along road 15-25 ft up. Going from tree to tree. [[red check mark]] Impossible to identify species (yet) [[margin, in red]] Cy? 11 [[/margin]] No other diglossini or Whitestart audible at the time. No Albi-type R's. Bird seems to have very large territory. Cy? Diglossa shuts up 5:50. Then Atlapetes Whistle songs begin. Lots of "complete" phrases. Presumably [[underlined]] rufinucha [[/underlined]]. [[left margin note in red]] Albi? [[/left margin note in red]] Also some R's which may be Albi and/or Tiaris. These Songs