Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico   By: E. Raymond (Eugene Raymond) Hall (1902-1986)

BY

E. RAYMOND HALL

University of Kansas Publications Museum of Natural History

Volume 5, No. 4, pp. 33 47, 1 figure in text October 1, 1951

University of Kansas LAWRENCE 1951

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Edward H. Taylor, Robert W. Wilson

Volume 5, No. 4, pp. 33 47, 1 figure in text

October 1, 1951

UNIVERSITY OF KANSAS LAWRENCE, KANSAS

PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1951

23 7414

Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico

BY

E. RAYMOND HALL

What species of mammals occur on the "coastal island", barrier beach, of Tamaulipas? Are the closest relatives of these mammals on Padre and Mustang islands of Texas, instead of on the mainland of Tamaulipas, or are the mammals on the barrier beach distinct from all others? These were questions that Dr. von Wedel of Oklahoma City and I asked ourselves in March of 1950 when we were in southern Texas. With the aim in mind of answering these questions, Dr. von Wedel arranged round trip transportation, by air, for the two of us between Brownsville, Texas, and Boca Jesús María. The latter place is a "pass", tidal inlet, through the long barrier beach. The waters of the Gulf of Mexico and of the lagoon behind the beach flow back and forth with the changing tides through the inlet.

We arrived at Boca Jesús María on March 18, 1950, and left on March 22, 1950. Our headquarters there were in one of the four one story buildings immediately north of the inlet. This place is approximately 89 1/2 miles south, and 10 miles west, of Matamoros, Mexico. Most of our collecting was done on the sand dunes one and one half miles north of the buildings but on the evening of March 20 we made a round trip, by boat of course, to the sand dunes on the south side of the inlet to set traps; these traps, and the Dipodomys that were caught in them, were picked up the following morning.

At the time of our visit, the part of the barrier beach south of the tidal inlet was connected with the mainland. The connection was far to the southward, according to our pilot, Mr. Kagy of Brownsville, and also according to the testimony of the Mexicans at the fishing camp where we stayed on the north side of the inlet. The barrier beach which lay to the north of the inlet extended sixty odd miles northward to the delta of the Río Grande and had, we were told, eight "passes," including Paso Jesús María. At the time of our visit, however, only three of these tidal inlets were open, it was said; the five others were thought to be filled in with sand, which permitted terrestrial animals to move from one part of the beach to another. Dr. von Wedel and I saw two tidal inlets that were open when we were being flown back to Brownsville.

[Illustration: FIG. 1. Diagram of physiographic features of the barrier beach of Tamaulipas. Top view looking down, as from an airplane, on the beach. Bottom view is profile.]

The long, low, sandy island, technically a barrier beach, irrespective of tide varied in width from a quarter of a mile to as much as a mile and was separated from the mainland by the Laguna Madre, which was four miles wide opposite our trapping station. To the northward the width of the lagoon gradually increased until, at a place thirty miles north of our trapping station, the lagoon was almost 20 miles wide.