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Comparative Morphology of the Skin-Inhabiting Micro-Filariae of Man, Cattle, and Equines in Guatemala¹

1. Man, cattle, and horses in the onchocerciasis zone of Guatemala are infected with microfilariae which inhabit the dermal layer of the skin and do not circulate in the blood. These microfilariae belong to the species Onchocerca volvulus (Leuckart, 1893), O. gutturosa Neumann, 1910, and O. reticulata Diesing, 1841 (= O. cervicalis Railliet and Henry, 1910), respectively.

2. The microfilariae of these three species can be distinguished morphologically on the basis of the form, size and arrangement of the caudal nuclei.

¹ The studies and observations on which this article is based were conducted by the Laboratory of Tropical Diseases of the National Institutes of Health, U. S. Public Health Service, under the sponsorship of the Pan American Sanitary Bureau in cooperation with the Dirección General de Sanidad Pública of the Republic of Guatemala. The investigation was aided by a research grant from the Division of Research Grants of the National Institutes of Health.

The work reported in this paper was submitted to the University of Michigan by the author as a dissertation in partial fulfillment of the requirements for the degree of Doctor of Philosophy.