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On the age distribution of Smilodon Californicus Bovard from Rancho La Brea

Published in Contributions in Science, in 1968, in volume 131, pages 1-17

Taxonomic notes on some Mexican cephalotine ants (Hymenoptera: Formicidae)

Published in Contributions in Science, in 1968, in volume 132, pages 1-10

A mandible of Didelphodon vorax (Marsupialia, Mammalia)

Published in Contributions in Science, in 1968, in volume 133, pages 1-11

Populational variation in the frog genus Phrynohyas fitzinger in Middle America

Published in Contributions in Science, in 1968, in volume 134, pages 1-25

New genera and species of wasps of the tribe Trypoxylonini from the neotropical region (Hymenoptera, Sphecidae, Larrinae)

Published in Contributions in Science, in 1968, in volume 135, pages 1-9

A new porcupine from the Middle Pleistocene of the Anza-Borrego Desert of California, with notes on mastication in Coendou and Erethizon

Published in Contributions in Science, in 1968, in volume 136, pages 1-15

Swollen dorsal fin elements in living and fossil Caranx (Teleostei: Carangidae)

Published in Contributions in Science, in 1968, in volume 137, pages 1-10

Review of the lanternfish genus Lampadena with a description of a new species

Published in Contributions in Science, in 1968, in volume 138, pages 1-29

A new genus of mustelid from the Ellensburg Formation, Washington

Published in Contributions in Science, in 1968, in volume 139, pages 1-6

A new plethodontid salamander from Sonora, Mexico

Published in Contributions in Science, in 1968, in volume 140, pages 1-11

A new subfamily of blind beetle from Idaho ice caves with notes on its bionomics and evolution (Coleoptera: Leiodidae)

Published in Contributions in Science, in 1968, in volume 141, pages 1-14

Tertiary birds from Laguna Hills, Orange County, California

Published in Contributions in Science, in 1968, in volume 142, pages 1-21

A new piculet from Amazonian Bolivia

Published in Contributions in Science, in 1968, in volume 143, pages 1-2

Studies on North American bees of the genus Hylaeus. 4. The subgenera Cephalylaeus, Metziella and Hylaeana (Hymenoptera: Colletidae)

Published in Contributions in Science, in 1968, in volume 144, pages 1-6

Three new epitoniid gastropods from the Panamic Province

Published in Contributions in Science, in 1968, in volume 145, pages 1-6

Otoliths and other fish remains from the Timms Point Silt (Early Pleistocene) at San Pedro, California

Published in Contributions in Science, in 1968, in volume 146, pages 1-29

Occurrence of a giant bison, Bison Latifrons, and a slender-limbed camel, Tanupolama, at Rancho La Brea

Published in Contributions in Science, in 1968, in volume 147, pages 1-9

Records of bats from Costa Rica

Published in Contributions in Science, in 1968, in volume 148, pages 1-21

Photonectes munificus, a new species of melanostomiatid fish from the South Pacific Subtropical Convergence, with remarks on the convergence fauna

Published in Contributions in Science, in 1968, in volume 149, pages 1-6

Chiggers of the genus Pseudoschoengastia (Acarina: Trombiculidae) from Costa Rica

Published in Contributions In Science, in 1968, in volume 150, pages 1-49

A new Early Tertiary perissodactyl, Hyracotherium seekinsi, from Baja California

Published in Contributions in Science, in 1968, in volume 151, pages 1-11

A new Central American sand fly breeding in crab holes (Diptera, Ceratopogonidae)

Published in Contributions in Science, in 1968, in volume 152, pages 1-7

A new piculet from southeastern Peru

Published in Contributions in Science, in 1968, in volume 153, pages 1-4

A new species of Eurhopalothrix from El Salvador (Hymenoptera: Formicidae)

Published in Contributions in Science, in 1968, in volume 154, pages 1-4