CARRIKER ON IMALLOPHAGA 



47 



Other known species of the genus; the male is smaller and the female 

 larger than in any previously known species. 

 Measurements are as follows: 



Genus Passonomedea Carriker 



Passonomedea Carriker, 1944, Bol. Ent. Venezolana, vol. 3, p. 79. — Type species: 

 P. hopkinsi Carriker. 



The genus can be separated from Goniodes by the shape of the head in 

 both sexes, structure of the male antennae, unusual sexual demorphism, 

 and the male genitalia. The male is larger than the female, a most unusual 

 feature, and the male genitalia are absolutely unique. 



A second species has been found and is described below. Apparently 

 the genus is found only on hosts of the avian genus Odontophorus. 



Passonomedea emersoni, new species 



Figure v:4 



Holotype female from Odontophorus stellatus (Gould) collected in NE. Peru 

 (type in USNM). 



Diagnosis: The holotype has the thoracic area and tip of abdomen 

 partially obscured by foreign matter, some details are invisible but all of 

 those shown in figure are correct. Most of the setae are missing but the 

 alveoli are visible. 



This female strongly resembles some of the females of Heptarthrogaster, 

 found on the genus Odontophorus, especially in the shape of the head, but 

 the abdominal sclerites are very different from those of Heptarthrogaster and 

 also differ strongly from the type of Passonomedea hopkinsi. It is most un- 

 fortunate that the male was not secured. 



The thoracic segments are extremely short and wide; the abdomen is 

 almost circular; and the posterolateral angles of the temples are strongly 

 rounded, not angulated as in P. hopkinsi. The structure of the distal por- 

 tion of the abdomen cannot be clearly seen and no attempt has been made 

 to show the details. 



However, I am convinced that it represents an undescribed species of 

 the genus Passonomedea, a genus unique and apparently very rarely met 

 with. 



Measurements are given in tabulation above. 



