By Rupert L. Wenzel, Vernon J. Tipton (editors)

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Apparently the species of this genus have a wide geographic range. Within a large group of specimens, the castroi-pilifer-thori complex, there are several more or less distinct subgroups. The characters which separate the species of the complex are not clearly defined and there is extreme variation within a long series from the same host specimen. , shape and size of coxal setae, plate size and shape and details of the chelicerae, are variable even on the same specimen. If one could obtain specimens from enough localities a few miles apart, it is possible that one would find clines of characters throughout Central and South America.

Capita, 2 females from O. caliginosus and 1 female from 0. bombycinus, Cerro Azul 57 females from O. capita, 9 females from Proechimys semispinosus and 1 female from Didelphis 10 females from O. capita, Rio marsupialis, Camp Pina (Canal Zone) 8 females from O. Seteganti (Darien) capita, Cerro Hoya (Los Santos) to collected R. 1956 M. Altman, C. O. Handley, C. M. July by February 1962, Keenan and V. J. Tipton. In the collections of the Environmental Health Branch, Canal Zone, and V. J. Tipton. : , : ; ; ; Laelaps thori Fonseca.

S. Nat. , 82, (30), p. 7 (Lima, Peru). Gigantolaelaps peruvianus Fonseca, 1939a, Mem. Inst. , p. 60). MATERIAL EXAMINED: 140 females from hosts and localities mentioned below, collected from July 1956 to September 1961 by R. M. Altman, C. O. Handley, C. M. Keenan and V. J. Tipton. REMARKS: Furman and Tipton (1961) have discussed the morphological variation in 75 Venezuelan specimens of G. wolffsohni, the majority of which were from eight identified host species. We have 140 Panamanian specimens from six host species from six localities.

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