DEC. 19, 1921 ABSTRACT: ORNITHOLOGY 511 



at both the international and national stations in the Milk and St. Mary- 

 River basins (Montana and Canada). It was prepared under the direction 

 of the United States Geological Survey, the United States Reclamation 

 Ser\dce, and the Reclamation Service of Canada. Most of the records 

 assembled appear as originally published in reports of the Reclamation 

 Service of Canada and the United States Geological Survey, but some have 

 been revised. Tables of daily discharge not heretofore published have 

 been taken from the original records. The data presented for each gaging 

 station in the area covered by this report comprise a description of the station, 

 a table giving results of discharge measurements, a table showing the daily 

 discharge of the stream, and a table of monthly and yearly discharge and 

 run-off. Hydrographs are given for 13 stations. N. E. DowELL. 



PALEONTOLOGY. — American species of Operculina and Heterostegina 

 - and their faunal relations. Joseph A. Cushman. U. S. Geol. Sur. 

 Prof. Paper 128-E: 125-131, pis. 18-21. 1921. 



Before 1915, the presence of nummulites in the upper Eocene limestone 

 of central Florida was thought to distinguish that rock, to which the name 

 Ocala limestone was applied, from the otherwise similar "Peninsula lime- 

 stone." Latterly, nummulitic Foraminifera have been found at many 

 places in the much wider area in Florida, Georgia, and Alabama throughout 

 which the Ocala limestone as now defined extends. 



Besides Heilprin's two species Nummulites willcoxi and N. floridensis, 

 which are now referred to the closely related genus Operculina, Doctor Cush- 

 man describes and figures three new species of Operculina and one new species 

 and variety of Heterostegina from the Ocala limestone. Nummulites antillea 

 Cushman, from limestone of the same age as the Ocala in the island of Saint 

 Bartholomew, is referred to Operculina. A previously described species 

 of Heterostegina, H. antillea, comes from the Oligocene of Antigua, vSt. Croix, 

 and Santo Domingo. C. Wythe CookE. 



PALEONTOLOGY. — A new species of Orthophragmina from Louisiana. 

 Joseph Augustine Cushman. U. S. Geol. Siu*. Prof. Paper 128-E: 

 139, pi. 22. 1921. 



This short paper, which is supplementary to the author's "The American 

 Species of Orthophragmina and Lepidocyclina," describes and figures Ortho- 

 phraginina advena Cushman from the St. Maurice formation (lower Claiborne 

 Eocene) of Natchitoches, La. C. Wythe Cooke. 



ORNITHOLOGY. — Descriptions of api?arently new South American birds. 

 W. E. Clyde Todd. Proc. Biol. Soc. Wash. 33: 71-76. 1920. 



Study of the material obtained from recent explorations in French Guiana, 

 the lower Amazon, and the Santa Marta region has resulted in the discovery 

 of further new birds which are here described. The three new species are: 

 Polioptila guianensis, from French Guiana; Myrmopagis paraensis, from 

 Brazil; and Nyctipolus maculosus, from French Guiana. The thirteen new 

 subspecies are as follows: Myospiza aurifrons meridionalis, from Bolivia; 

 Brachyspiza capensis argentina, from Argentina; Volatinia lacarini atron- 

 itens, from Mexico; Sublegatus glaber obscurior, from French Guiana; Say- 

 ornis latirostris fumigatus, from Colombia; Sirystes albocinereus subcan- 



