CONTRIBUCION AL CONOCIMIENTO DE LOS NEMATODOS DE LAS AVES DE MEXICO. - III.

Resumen

The preceding article makes the thirth contribution to the knowledge of Nematoda of Mexican Birds. Two new species are described: one of genus Oxyspirura and the other of the Microfilaria group.
Oxyspirura navali n. sp. differs from the actually known species in the peculiar arrangement and number of the papillae of caudal end of male, and the presence of a symetrical glandular organ in the anterior thirth of the
oesophagus.
The Microfilaria rhamphastotis n. sp. was found in the blood-stream of the toucan (Rhamphastos carinatus Sw). The chief characters to distinguish this species from the species of Microfilaria occurred in the South American
Birds which have been studied by Mazza and his students are: size and structural arrangement of the nucleus and of the nervous primordius, excretory and genital.