REVISION OF THE SARCOPSYLLIDAE 45 
American Chigoe or Jigger. But the term Echidiiopbaga cannot be rejected on account 
of its being an inappropriate name ; the majority of generic names are more or less 
inappropriate, if the original ( = philological) meaning of the word is considered. 
Although, however, Echidnophaga is in our opinion an earlier term for the same 
genus which Baker named Xestopsylla in 1904, and Enderlein Argopsylla in 1903, 
we do not know which of the Australian species of this genus is the one which Olliff 
named ambulans. We have applied the name to a species of which we have received a 
large quantity of besides one $, from Paramatta, near Sydney, but whether this 
assumption is correct can only be decided by a careful examination of the type of 
ambulans. 
There are eight species ot Echidnophaga known to us. The genus does not occur 
in America, apart from E. gallinaceus which has been introduced with the host. The 
larva is not known of any of the species. 
The species occur on mammals and birds. They are not confined each to one 
kind of host. 
Key to the species :— 
(a) Claw of tarsus with a very large basal projection — E. macronychia. 
,, ,, ,, small ,, — b. 
ib) Fifth tarsal segment on each side with one heavy subbasal bristle, a 
thinner medium one, and a small postmedian hair — E. liopus. 
Fifth tarsal segment on each side with five heavy bristles — E. bradyta. 
Fifth tarsal segment on each side with three heavy bristles and a 
smaller fourth — c. 
(t) Fifth tarsal segment with two apical ventral bristles — d. 
,, „ ,, „ one ,, ,, bristle — e. 
(d) Second bristle of fifth tarsal segment midway between first and third — 
E. gallinaceus. 
Second bristle nearer the first than the third — E. farina. 
(e) Occiput of $ with lateral lobe — E. ambulans. 
„ ,, without „ — f. 
(/) Second segment of maxillary palpus longer than the third — E. murina. 
,, „ ,, ,, not longer than the third — E.aethiops. 
1. Echidnophaga macronychia, spec. nov. 
(PI. I, Fig. 7, S ; PI. II, Fig. 15 ; PI. Ill, Fig. 22, 24). 
Head. — The frons is strongly rounded at the centre, being slightly angulate. 
The oral edge is feebly convex in the middle ; measured from the ventral frontal 
corner to the apex of the ventral genal process it is shorter than the genal edge 
measured from the base of that process to the apex of the posterior genal process. 
