REVISION OF THE SARCOPSYLLIDAE 
55 
ambulans for one of these two insects, though it is quite possible that the true 
ambnlans is distinct from both. As Olliff's species was discovered in New South 
Wales we identify as ambulans that species of which we have received a large number of 
specimens from the same country. This is, of course, a mere surmise. 
This ambulans does not differ from E. gallinaceus, except in one character. All 
the specimens of ambulans have on the fifth tarsal segment one apical ventral bristle 
only, instead of the two found in all the specimens of gallinaceus which we have 
examined. It appears to us probable that ambulans and gallinacais are geographical 
forms of the same species. There may exist, probably in the (Malay Archipelago, a 
form in which that differential character is either individually variable, or in which 
the fifth tarsal segment bears two such bristles on the fore and mid tarsi, and one 
only on the hind tarsus (or vice versa). 
Olliff's specimens were taken off Echidna hystrix. We have : — 
i ^,949 ?■ From Paramatta, near Sydney, oft' Trichosurus vulpecula. April, 1904. (I'll. Schrader). 
8 9$. „ Victoria, 
1 9- >» Kojonup, West Australia, oft" Bettongia lesueuri. March, 1904. (C. |. Tunney). 
1 9 • >, Herdman's Lake, Perth, West Australia, Diemenia superciliosa (!) (Dr. Woodward). 
2 9 9- « Cranbrook, West Australia, off Myrmecobius fasciatus. March, 1900. (C. J. Tunney). 
109 9- » Magitup, West Australia, oft" Paragale lagotis. June, 1900. (C. J. Tunney). 
The occurrence on the Brown Snake (Diemenia superciliosa) is of interest, this 
being the first instance recorded of a flea occurring on a reptile. 
7. Echidnophaga murina 
Sarcopsylla gallinacea, Tiraboschi, Bull. Soc. Zoo/. I fa/. XI, p. 172 (1902) (Italy on Mus alexan- 
drinus) ; it/., Arch. Parasi/ol. VII. p. 124 (1903) (Italy) ; id., I.e. VIII. p. 303. fig. 429 
(19°+)- 
Sarcopsylla gallinaceus var. murina id., I.e. Vfl. p. 124 (1903) (Italy). 
Sarcopsylla gallinacea var. italic a id., I.e. (Italy). 
Sarcopsylla rhynchopsylla id., I.e. Vlli. p. 309. fig. 46 (1904) (Italy, on rats). 
Argopsylla rhync/wps\lia, Baker, Proc. U. S. Nat. Mas. XXIX. p. 125 (1905). 
This is the only species of Sarcopsyllidae hitherto recorded from Europe. 
Dr. Tiraboschi, when redescribing the insect as a species in 1904 under a 
third new name, had some doubts as to its being distinct. Through the kindness of 
Herr Kohaut, of Budapest, who lent us the two specimens which he had received 
from Dr. Tiraboschi, we have been able to compare this insect with the allied species. 
We find it to be a very close ally of E. gallinaceus, but consider it distinct from that 
species on account of the differences mentioned hereafter. 
Only the $ is known. 
Head. — The head is a little longer than that of E. gallinaceus. The occiput 
bears two rather heavy bristles above the antennal groove, as in E. gallinaceus. The 
