Art. 10 



LICE OF THE GENUS PEDTCULUS EWING 



13 



dance were present. These Pediculids appear to agree in all respects 

 with those from Ateles paniscus, hence the writer is of the opinion 

 that the lice lepresented stragglers on the marmosets notwithstand- 

 ing they had lived for some days on this peculiar host. 



Mjoberg (1910) described as new his Pediculus affinis from an 

 undetermined species of Ateles. Later (1916) Ferris gave a new 

 name to this louse, that of injohergi, since affinis was preoccupied. 

 When the present writer compared the specimens of pediculi from 

 Ateles pani'^'cus with Piaget's description and figures considerable 

 disagreement was found. When compared with Mjoberg's descrip- 

 tion and figure almost perfect agreement w^as noted. Both Piaget 

 and Mjoberg give a detailed drawing of the ventral side of the 

 last segments of the female, showing the genital plate and gonopods. 

 I find that in the specimens I have studied the genital plate and the 

 gonopods are as Mjoberg figures them, as is shown on photograph 

 (pi. 1, fig. 2). Not only this but the smaller differences mentioned 



PK. al^ritarum 



Patelophilus 



Fig. 5. — Anterior view of distal end of left hind tibia of males of three species of 

 i'edicdlusj all drawn to the same scale 



by Mjoberg between his affinis and Piaget's co7isobrinus I find do 

 not hold W'hen specimens from the type host of consohrinus are ex- 

 amined. It appears that the drawing given of the genital plate and 

 gonopods by Piaget were made from a specimen that was somewhat 

 shriveled (as most balsam mounts are). This would particularly 

 account for the strongly-curved, sharp-pointed gonopods as figured 

 by Piaget. I do not believe that gonopods of such a shape exist 

 anywhere in the genus Pediculus. 



This large louse is very typical of the subgenus Parapediculus^ 

 and quite difl'erent from the head louse of man as noted by Piaget, 

 Mjoberg, and others. 



PEDICULUS (PARAPEDICULUS) CHAPINI, new species 

 Plate 1, figs. 3 and 4 ; text figs. 2, 4B, 5 



Female. — Head with poorly developed neck region; postocular 

 tuber(;lc ratlier pronounced ; forehead about twice as broad as long, 

 slightly swollen. Antennae about as long as head ; segment I almost 

 twice as wide as long; segment II about one and a half times as long 



