Vol. 21 No. 2 (1973): Volume 21 - Regular number 2 - July 1973

Sneh Lata Verma

181–186

Helminth parasites of freshwater fishes. X. On two new trematode parasites of freshwater fishes from Lucknow, India

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Chr. P. Christow

187–195

Wirkung von Antiaminosauren auf Trichomonas vaginalis

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Carlos R. Villalobos

197–203

Ptychophallus costaricensis, a new freshwater crab from Costa Rica

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Richard W. Pohl

205–206

Floración primera del zacate gigante del Volcán Turrialba, Costa Rica

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Bert B. Babero, Katharina Golling

207–220

Some helminth parasites of Nevada bullfrogs, Rana catesbiana Shaw

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María Isabel Morales, Maryssia Nassar, J. A. Saénz

221–227

Lycoperdaceae of Costa Rica. I. The genus Morganella

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J. S. Balsano, Ellen M. Rasch

229–257

Biochemical and cytogenetic studies of Poecilia from eastern México. I. Comparative microelectrophoresis of plasma proteins of seven species

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Silvia Toral Almazán, Andrés Reséndez Medina

259–279

Los cíclidos (Pisces: Pereiformes) de la Laguna de Términos y sus afluentes

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D. J. Howell, Derek Burch

281–294

Food habits of some Costa Rican bats

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Jay M. Savage, James L. Vial

295–349

The venomous coral snakes (genus Micrurus) of Costa Rica

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Ellen M. Rasch, J. S. Balsano

351–381

Biochemical and cytogenetic studies of Poecilia from eastem Mexico. II. Frequency, perpetuation, and probable origin of triploid genomes in females associated with Poecilia formosa

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Richard T. Taylor, Alvaro Flores, Guillermo Flores, Róger Bolaños

383–397

Geographical distribution of Viperidae, Elapidae and Hydrophidae in Costa Rica

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Ronald C. Baird

399–416

Aspects of social behavior in Poecilia latipinna (Lesueur)

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German F. Sáenz, Guido Arroyo, Ma. de los Ángeles Alvarado, Gerardo Montero, Javier Jiménez, Eliécer Valenciano

417–424

Hemoglobinas anormales en una población estudiantil universitaria

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J. A. Sáenz, Maryssia Nassar, María Isabel Morales

425–427

Clave para Falales (Phallales) de Costa Rica

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Vol. 21 No. 2 (1973)

Articles