THE FLEAS OF NORTH AMERICA 89 



Range. — Northeastern part of the United State?. 



The original description is accompanied by a figure of the ventral 

 arm of sternal plate IX of the male. The female has been redescribed 

 and figured by I. Fox (26. pp. 78 and 171). 



Hystrichopsylla mammoth Chapin 



Hystrichopsylla mammoth Chapin, 1921, Wash. Bnt. Soc. Proc. 23: 25. 



Type host. — Apl.odontia Tufa calif o mica (Peters) (mountain 

 beaver). 



Type locality. — Mammoth. Mono County, Calif. 



Range. — Western part of the United States. 



The male sternal plate IX of this species was figured by Jordan 

 (44< P- 210) • This species is characterized by its very large size, some 

 females being as much as 8 mm. in length. 



Hystrichopsylla schefferi Chapin 



Hystrichopsylla schefferi Chapin, 1019, Brooklyn Ent. Soc. Bill. 14: 50. 



Type host. — "Nest of Aplodo-ntia rufa (mountain-beaver)." 



Type locality. — Puyallup, Wash. 



Range. — Known only from Washington. 



This species was described from a single female specimen and 

 has not been rediscovered. It is distinguished from Hystichopsylla 

 gigas dippiei by the difference in the number of spines in the pronotal 

 comb, there being 46 in H. schefferi and 36 in H. g. dippiei. 



The Subfamily MACROPSYLLINAE Oudemans 



Head divided into anterior and posterior parts by the development of 

 f ronto-epicranial groove ; postvertical tubercle present. Front not greatly re- 

 duced and not dorsal in position. Gena not greatly enlarged. Eyes reduced. 

 Labial palpus with many segments (over 10) and greater in length than head. 

 Cephalic comb composed of spines with rounded tips and situated both along 

 ventral margin of gena and anterior margin of antennal groove. Antenna 

 with short club, segments not anchylosed. Abdomen provided with combs. 



Contains but a single genus, Macropsylla Rothschild, which is 

 restricted to Tasmania. 



Oudemans (59, p. loo) in 1909 established the family Mac- 

 ropsyllidae for Macropsylla Rothschild and Stephanocircus Skuse. 

 The first of these is restricted to Tasmania, while the second occurs 

 in Australia and Tasmania. Oudemans even went further and 

 erected for this family the superfamily Posttuberata. This was sep- 

 arated from his superfamily Intuberata because of the presence of 

 the postvertical tubercle. More recent collections of fleas from the 

 Southern Hemisphere have shown that other genera possess this 

 tubercle and that the dividing of the genae and the presence of the 

 helmet in Stephanocirous ally it with certain South American genera. 



The Subfamily LEPTOPSYLLINAE Rothschild 



Fronto-epicranial groove usually deep, dividing head into anterior and pos- 

 terior parts. Front greatly reduced, anterodorsal or dorsal in position, and 

 forming less than one-half of anterior margin of head, possessing not more 

 than 2 pairs of dermal pits and never more than a vestigial frontal tubercle. 



