8 PROCEEDINGS OP THE NATIONAL. MUSEUM Vor„ 68 



AMERICAN REPRESENTATIVES OF THE GENUS PEDICULUS LIN- 

 NAEUS 



PARAPEDICULUS, new subgenus 



The Pediculi of Ateles can, in general, be differentiated by 

 using the same set of characters that are used in separating the 

 varieties occurring on man. The writer recognizes four Ateles- 

 infesting species, two of which are here described as new, and all 

 of which may be keyed out as follows : 



KEY TO SPECIES OF SUBGENCS PAKAPEDICULDS 



A.* Segment VI of abdomen considerably broader and longer than V ; pleural 

 plate V about one and a balf times as long as IV 



P. (Parapediculus) lobatus Faln-enholz. 

 A.' Segment VI of abdomen not so broad as V and only slightly longer. 



B.^ The inner anterior and single postei'ior accessory spines of tibial 

 thumb, or protuberance, of legs II and III equidistant from the 

 terminal spine and neither situated in crotch of tibia ; pleural plate 

 I very small and not much larger than the inclosed stigmal foramen 

 P. (Parapediculus) atelopliilus, new species. 

 B.' The inner anterior accessory spine of tibial thumb of leg II and III 

 situated almost in crotch of tibia, while posterior accessory spine is 

 situated contiguous with the chief, or terminal, spine ; pleural plate 

 I much larger, squarish and over twice the width of Inclosed 

 stigmal foramen. 



C.^ Diameter of bulb of thoracic spiracle about 0.09 mm. ; posterior 

 accessory spine of tibial thumb II and III much more slender 

 than the inner anterior accessory spine 



P. (Parapediculus) consobrinus Piaget. 

 C* Diameter of bulb of thoracic spiracle about O.OG mm. ; posterior 

 accessory spine of tibial thumb II and III subequal with the 

 inner anterior accessory spine 



P. (Parapediculus) chapini, new species. 



PEDICULUS (PARAPEDICULUS) LOBATUS Fahrenholz 



Plate 2, figure 5 



1913 Pediculus lobatus Faheenholz, Zool. Anz., vol. 41, p. 373 (no descrip- 

 tion). 

 1917 Pediculus lobatus Fahrenholz, Zool. Anz., vol. 48, p. 89. 



1919 Pediculus humanus, race capitis Nuttall, Parasitology, vol. 10, pp. 



337, 340. 



1920 Pediculus humanus, race capitis Nuttall, Parasitology, vol. 12, p. 142. 



Female. — Head with well-developed neck region; forehead 

 swollen, being broader at about its middle than at its base. Antennae 

 shorter than head. Macrochaetae of thorax unequal, the middle pair 

 longer than the others; machrochaeta I about one-third as long as 

 the width of the first coxa; macrochaeta III situated about the 

 diameter of the bulb of thoracic spiracle behind the same. Abdomen 

 rather short and very broad at the sixth segment, which is much 

 broader than any other segment and almost twice as long as seg- 



