Vol. XXIX, pp. 95-98 June 6, 1916 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON PRELIMINARY DIAGNOSES OF FIFTEEN APPARENTLY NEW NEOTROPICAL BIRDS. BY W. E. CLYDE TODD. Further studies of the neotropical birds in the collection of the Carnegie Museum have brought to light a number of addi-tional species and subspecies apparently new to science, which are described herewith, in a preliminary way. The present paper is the fourth of the series to appear in these Proceedings, and the author has again to acknowledge his indebtedness to Mr. Harry C. Oberholser for his kind assistance. Measure^ ments are in millimeters. Nemosia pileata hypoleuca subsp. nov. DiflFers from all the other known forms of Nemosia pileata in having the entire mider surface pure white in the male, with practically no bluish or grayish suffusion ; size same as in iV. p. nana Berlepsch. Type, No. 49,420, Collection Carnegie Museum, adult male; Tucurinca, Santa Marta, Colombia, September 15, 1915; M. A. Carriker, Jr. Amblycercus holosericeus centralis subsp. nov. Similar in color to Amblycercus holosericeus holosericeus (Lichtenatein), but differing in relative proportions of the wing and tail, the former being decidedly longer than the latter, instead of the reverse. Wing (type), 106; tail, 100; exposed culmen, 32; tarsus, 15.5. Type, No. 24,191, Collection Carnegie Musevun, adult male ; Rio Sicsola, Costa Rica, October 12, 1904; M. A. Carriker, Jr. Basileuterus cabanisi indignus subsp. nov. Similar to Basileuterus cabanisi cabanisi Berlepsch, but middle of crown without, or with but a trace of, Mars yellow, being merely plain dull lemon yellow. 22— Proc. Biol. Soc. Wash., Vol. XXIX, 1916. (95)
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