PAPER 11 CARRIKER ON MALLOPHAGA 23 



Both setosa and calva have been taken on the same individual host of 

 Odontophorus hyperythrus (Colombia), 0. erythrops melanotis (Costa Rica), 

 and 0. e. parambae (Colombia), Present collections show that setosa is 

 much more abundant on Colombian species of Odontophorus than elsewhere, 

 but this may be misleading since much more collecting has been done 

 in that country. 



The calva group is found on a great many more hosts than setosa, especially 

 in the Cracidae, all but one of the species from that family belong to the 

 calva group; setosa is almost exclusively confined to the Phasianidae, 

 especially Odontophorus. 



The genus has been taken on three other genera of Phasianidae; Rhyn- 

 chortyx cinctus (only setosa)', Dactylortyx and Dendrortyx (only calva). 



Apparently the calva type, more abundantly concentrated on the 

 Cracidae, is the more primitive form, since the Cracidae antedates the 

 Phasianidae geologically. Evidently the setosa type developed later on 

 some form of the Phasianidae, possibly Odontophorus, in northern South 

 America and has gradually invaded other genera to the north. 



In the new material from Odontophorus hyperythrus and 0. erythrops parambae, 

 both types are represented and both were taken on the same individual 

 host. The females may be separated at a glance by the presence or ab- 

 sence of patches or fringes of setae on the distal abdominal segment; but 

 the males are exceedingly difficult to separate and to allocate to their 

 respective females. The males may be separated on size and shape of the 

 head and by the structure of abdominal segments VIII-IX. A certain 

 structure in these two segments correspond to females with hirsute segment 

 IX, and a different structure to the nonhirsute females. These facts have 

 been correlated by a careful stvidy of many specimens of both types. 



Trichodomedea leucolaema, new species 

 Figures ivA-^ 



Holotype male, allotype female, and thi'ee paratypes from Odontophorus 

 leucolaemus Salvin collected in Honduras (in USNM). 



Diagnosis: One of the larger species, with little difference in size between 

 the two sexes and less than usual sexual dimorphism of the head. Cephalic 

 index of frons and temples is 0.75 : 1.30 for the male and 0.96 : 1.30 for 

 the female. The three distal segments of the male antennae are unusually 

 small (fig. 1). Male genitalia are distinctive: very wide and short (fig. 2) 

 and differ from all other known species. Distal abdominal segment of 

 female also differs from other known species by having perfectly straight 

 lateral margins anterior to claspers. 



768-906—67- 



