1. Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic.
2. Department of Invertebrates, Natural History Museum, P.O. Box 6434, CH-1211 Geneva 6, Switzerland.
3. Division of Natural Sciences, Northeast Texas Community College, 2886 FM 1735, Chapel Hill Road, Mt. Pleasant, Texas 75455.
4. University of North Dakota, Grand Forks, North Dakota 58202.