50 Fleas of Eastern United States 



conspicuous, completing one or two turns. For further details 

 concerning the structure of the male genitalia, see Plate XII, 

 fig. 56. 



Female. General structure essentially as in the male. Sternite 

 VII usually without a distinct sinus, and the posterior border 

 not divided into lobes. Head of the receptaculum seminis 

 slender, more than twice as long as the tail. For further details 

 concerning the structure of the female genitalia, see Plate XII, 

 fig. 57. 



Records. NEW YORK — Altamount, June-July, 1936, in 

 "northern cliff swallow's nest," numerous specimens; Oneida 

 Lake, July 23, 1931, on "cliff swallows," male; Troy, June 2, 

 1935, two females; July 1, 1935, on same host, female (D. 

 Stoner) . 



Eastern host. "Northern Cliff Swallow." 



Eastern locality. New York. 



Type material. Male holotype from Okanagan Falls, British 

 Columbia, on "Riparia riparia" in the N. C. Rothschild Collec- 

 tion (British Museum) . Female allotype, described above, 

 from Altamount, New York, in the United States National 

 Museum. 



Ceratophyllus diffinis Jordan 



(Plate XII, figs. 58, 59) 



1925 Ceratophyllus diffinis Jordan, Nov. Zool., 32: 111, fig. 44. 



1928 Ceratophyllus diffinis Jordan, Nov. Zool., 34: 182, fig. 7. 



1933 Ceratophyllus diffinis Jordan, Nov. Zool., 39:75. 



1935 Ceratophyllus rileyi Liu, Ann. Ent. Soc. America, 28:123, Pi. I, figs. 



4, 5, 6. 

 1937 Ceratophyllus diffinis Jordan, Nov. Zool., 40:263. 



Male. Upper row of the preantennal region consisting of six 

 or seven bristles, of which the anterior are quite long, while the 

 others are reduced in size. Pronotum with a single row of 

 bristles and a ctenidium of twelve spines on a side. Other 

 details of general structure as in C. celsus and other species of 

 the genus. Modified segments: Process of the clasper promin- 

 ent, about twice as long as broad in the widest place; its apex 

 provided with three bristles, of which the middle is the longest, 

 while the other two are very short. Movable finger widest at 

 the middle where the anterior border is not produced into a 

 distinct spinelike protuberance. Posterior margin of the mov- 

 able finger armed with three or four conspicuous long bristles 

 and several smaller ones; anterior and dorsal borders armed 



