6 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 82, art. 29 



margins of dorsal plate and twice the diameter of either from each 

 other; pseudostigmatic organs almost flagelliform, longer than 

 dorsal plate, and with 3 to 6 inconspicuous barbs. Eyes well devel- 

 oped, posterior corneas distinct and almost as large as anterior ones. 

 Dorsal abdominal setae 30 to 36. Dorsal spine of tarsus I rather 

 short, slightly curved, and situated more than its length from base 

 of segment. Length of unengorged specimens, 0.41 mm; width, 

 0.32 mm. 



Type host. — Man. 



Type locality. — Aguabuenas, Republic of Panama. 



Type sZ^•6^e.— U.S.N.M. no. 1065. 



Remarks. — Described from five specimens, mounted on type slide, 

 taken from ear and scalp of child at hut near Aguabuenas, Republic 

 of Panama, by L. H. Dunn. This species is most nearly related to 

 Trortibicula hrasiliensis Ewing but has at least 30 dorsal abdominal 

 setae, while irasiliensis has about 26 dorsal setae. 



U.S GOVERNMENT PRINTING OFFICE : 193* 



