II. New Species of Trichodomedea (Mallophaga : Philopter- 



idae) From Neotropical Gallinaceous Hosts 



Since my first paper on the genus Trichodomedea, several new species 

 have been studied. Some specimens resulted from my collecting and 

 others were provided by Dr. K. G. Emerson. These new forms are herein 

 described and illustrated. 



Genus Trichodomedea Carriker 



Trichodomedea Carriker, 1945, Rev. Acad. Colombiana Cienc., vol. 6, p. 365, — Type 

 species: T. setosa Carriker. 



When Trichodomedea was described, the author was fully convinced 

 that it was not congeneric with Chelopistes Keler, and full and explicit 

 reasons were given for this belief. Nothing since has caused a change in 

 this belief. 



The type species of Chelopistes is parasitic on the common Turkey, 

 Meleagris gallopovo, which belongs to a family with a single genus, a single 

 species, and six recognized subspecies, all from the United States and 

 Mexico. This family is not closely related to the Cracidae or Phasianidae, 

 upon which all known species of Trichodomedea are parasitic. 



Trichodomedea is a large, very homogenic genus, with no abnormal or 

 aberrant species, and consists of two rather distinct groups that may be 

 easily recognized in the females by the presence or absence of abundant 

 short, fine setae on abdominal segment IX. The males of the setosa 

 group have shorter heads, of somewhat different shape, and characteristic 

 differences in abdominal segments VIII-IX, which support the long, 

 hairlike penis. 



The distribution of the setosa group is very puzzling, and much more 

 collecting must be done on both the Cracidae and Phasianidae before 

 any firm conclusion can be reached regarding it. 



Unquestionably the two types, setosa and calva, are not conspecific, 

 since both have been taken on the same individual host in at least five 

 cases; four from Odontophorus and one from Penelope montagnii, representing 

 each type. The authenticity of the host cannot be questioned, since no 

 specimen of Odontophorus was taken in the same locality as Penelope. 



The setosa group has been taken abundantly on Odontophorus guganensis 

 and two of its races, especially abundant on 0. g. marmoratus (Colombia), 

 but also was taken on the nominate race (British Guiana) and on 

 0. g. simonsi (Bolivia). 



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