Aet. 19 LICE OF THE GENUS PEDICULUS EWING 11 



segment I almost twice as broad as long; segment II about one and 

 a third times as long as broad and but slightly longer than III; 

 segment III longer than broad and longer than IV; segment IV 

 scarcely as long as broad; segment V short, only slightly longer 

 than broad. Macrochaetae of thorax medium, I and II subequal, 

 III slightly smaller; macrochaeta I slightly longer than the width 

 of coxae I; macrochaeta III situated about the diameter of bulb 

 of thoracic spiracle behind the same. Posterior marginal setae of 

 thorax, 7-9 on each side, including a larger submedian pair and 



Fig. 4. — A, lateral view of first pleural plate of right side of male of pediciilus 



(I'AUAPEDICULUS) ATELOPHILUS, NEW SERIES; B, LATERAL VIEW OF RIGHT PLEURAL 

 PLATES OF FEMALE OF PEDICULUS (PARAPEDICULUS) CHAPINI, NEW SI'ECIES 



three larger, subequal setae near the corner of thorax. Thoracic 

 spiracles rather small, diameter of bulb 0.089 mm., more dorsal than 

 lateral in position. Abdomen large; segment VI longer than V 

 but not so broad; all the abdominal setae except the minute hairs 

 arranged strictly in transverse rows; transverse row on ventral sur- 

 face of segment VI with 10-11 setae which extend scarcely half 

 way to posterior margin of segment, flanking pair of setae slightly 

 larger than those in row, discal setae few, minute hairs. Pleural 

 plates (fig. 3, D) large, conspicuous; pleural plate I squarish, over 

 twice as long as diameter of stigmatic bulb ; plate II squarish, about 

 as broad as I but much longer ; plate III very much larger than II 



