DESCRIPTIONS AND DETERMINATIONS OF SPECIES 65 



Trichodectes pallidus Piaget. 

 Trichodectes pallidus Piaget, Les Pediculines, p. 405, pi. 32, fig. 9, (1880). 



From Nasua narica (Zool. Garden, Rotterdam). The host is a na- 

 tive of Mexico and Central America. 



Trichodectes nasuatis Osborn. 

 Trichodectes nasuatis Osborn, Ohio Natur., vol. 2, p. 178, pi. 1, fig. 3, (1902). 



From Nasua narica (Central America). It is extremely likely that 

 this is the same as T. pallidas Piaget. 



Trichodectes painei Kell. & Nak. 

 Trichodectes painei Kellogg & Nakayama, Psyche, vol. 21, pp. 90-92, fig. 1, (1914). 



From unknown host (Baja California). It is easily recognizable by 

 the extremely long claws and the emarginate posterior margin of the sec- 

 ond abdominal tergite of the male. 



Trichodectes thoracicus Osborn. 

 Trichodectes thoracicus Osborn, Ohio Natur., vol. 2, p. 178, pi. 2, fig. 4, (1902). 

 From Bassariscus astuta (California). 



Genus GYROPUS Nitzsch. 



Gyropus Nitzsch, Germar's Mag., vol. 3, p. 302, (1818). 



Antennae concealed beneath the head, four-segmented, the fourth 

 segment very large; temples produced into angulated processes, mouth- 

 parts on the frontal margin of the head. Tarsi with one claw, which is 

 well developed. Occuring exclusively upon mammals. 



The members of this genus occur upon animals all of which are na- 

 tive to South America, although one of its hosts, the common guinea-pig, 

 is now found in all parts of the world. 



Gyropus ovalis Nitzsch. 



Gyropus ovalis Nitzsch, Germar's Mag., vol. 3, p. 304, (1818). 

 Common upon the ordinary guinea-pig. 



