Akt. 19 LICE OF THE GENUS PEDICULUS EWING 9 



ment V. Setae of abdomen nearly all arranged in transverse rows, 

 none is peg-like. Pleural plates in the single female observed not 

 sufficiently hardened for description. Legs moderate. 



Length of female newly formed and with adhering nymphal skin, 

 1.83 mm. ; width, 0.88 mm. 



Male. — Not observed by the writer. Fahrenholz gives only the 

 following sentence in regard to the male in his original description : 

 "^ mit zweiteiliger Genitalplatte (wie bei P. capitis viaculatus) .'''' 



Length, 1.89-2.19 mm. (Fahrenholz) ; width, 0.82-0.97 mm. (Fah- 

 renholz). 



Type host and type locality. — The host is Schlegel's spider monkey, 

 Ateles pan. Type locality? 



Type. — Deposition of type not Iniown to writer. 



Material examined consists of a single female not yet emerged 

 from her nymphal skin, many nymphs, and eggs. All of these were 

 obtained from a skin (U.S.N.M. 61284) of Ateles pan., the monkey 

 having been taken in Guatemala. 



This species is very distinct from all the others of its subgenus 

 and genus in the great development of segment VI (see fig. 5, pi. 2), 

 which protrudes conspicuously at the sides of the abdomen far be- 

 yond the other segments. 



In Fahrenholz's description of lohatas he writes that the six large 

 setae (macrochaetae) of the thorax are wanting. Nuttall (1920, p. 

 148) says that he firmly believes, " that they were merely overlooked 

 by being viewed through balsam." The writer finds that Nuttall is 

 correct in this belief. However, it should be added that the macro- 

 chaetae of the thorax in this species are much smaller than they are 

 in P. humanus. 



PEDICULUS (PARAPEDICULUS) ATELOPmLUS. new species 



Figs. 4A and 5 



Female. — Unlaiown. 



Male. — Head with neck very distinct ; a slight tubercle behind each 

 eye; iorehead dome-shajDed, being very slightly swollen. Antennae 

 about as long as head; segment I almost twice as broad as long; 

 segment II about one and two-thirds times as long as broad and al- 

 most equal to III plus IV; segment III slightly longer than broad 

 and slightly longer than IV; segment IV equally long and broad; 

 segment V about one-third longer than broad and shorter than 11. 

 Macrochaetae of thorax almost subequal; macrochaeta I about one- 

 half as long as the width of coxa I ; macrochaeta III situated about 

 the diameter of thoracic spiracular bulb behind the same. Posterior 

 marginal setae of thorax rather small, but there are at the lateral ex- 

 tremes of the posterior thoracic margin three larger, subequal setae. 

 79652—26 2 



