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Cherrie on Costa Rican Birds. --In two recent papers Mr. Cheftie has made known some of the more important restilts of his recent work on Costa Rican birds. The first* contains descriptions of' two new genera, eight new species, and one new subspecies, as follows: (x) LojSholr[cctts squatn•nicristatus •ninor, (2) L. zeledonL (3) PachyrhamtShus ornatus, (4) Deconychura (gem nov.) tydblca, ($) Premnoplex (gert. nov., type Marffornis brunnescens Lawr.), (6) Vireo su•ercœb'arti• (Ridgw. MS.), (7) ]3ast'leuterus salvœni, (8) Grallarœa lizanot', (9) Myrmœceza inletmedia. Tbere are notes also on ]3asileuterus delattrœ•', restricting the name to the Costa Rican form, and renaming the Guatemalan form B. salvint', as above. The Atlantic and Pacific forms ofArremon aurant[irostrt• are found to present slight differences, and in view of their probably proving separable the name Arremon attrant[t'rostr[s satttraltts is suggested for the dark-colored bird of the Atlantic slope. In the second paper,p which is really a continuation of the first, being based on the same collection, contains an annotated list of 55 species, and is a paper of much interest and importance. The annotations are often based on large series of specimens, and relate to individual, seasonal, or other variations, with often extended tables of measurements, and critical remarks on the afifinities and nomenclature of the species treated. Dendrornœs lawrencei Ridgw. is considered a synonym of D. nana Lawr., as first shown hyMl'. Elliot (Auk, VII, p. x74 ) and now conceded by Mr. Ridgway. The D. lawrence[ costar[censis Ridgw. hence now becomes D. nana costart'censt3. Picolaptes ffrac[lt• is also referred to ]•. comfiressus, of which measurements are given of 33 specimens. --J. A. A.

ornithology

Shufeldt on the Osteology of Arctic and Sub-Arctic Water Birds Contributions to the Comparative Osteology of Arctic and Sub-Arctic Water-Birds. Parts V-IX R. W. Shufeldt