The Genus _Echidnophaga_ was created by Olliff (Pro. Linn. Soc. N.S.W. 1886) to contain a species he described under the name of _Echidnophaga ambulans_; it is remarkable for its very long proboscis, and short legs which render it unable to jump. Large numbers of this flea were found upon a Porcupine Ant Eater (_Echidna hystrix_) in the Australian Museum. Messrs. Jordan and Rothschild in the Revision previously noticed place 8 species in Olliff’s Genus, adding two more to the Australian fauna, _E. macronychia_ from West Australia found upon a small marsupial (_Bettongia lesueuri_), and _E. liopus_ also from West Australia on _Echidna aculeata_, at the same time recording the last-named species upon rats at Agra, India. They give a number of additional hosts of _E. ambulans_, namely: the opossum, several other marsupials, and the brown snake; and they extend its range from Sydney to West Australia. The Chicken Flea, _E. gallinaceus_, which they place in this Genus (originally described by Westwood under the generic name _Sarcopsylla_) though it has not been recorded from Australia has a range from America, Africa, and Russia to Fiji; it infests a great number of both wild and domestic animals and birds. Skuse (Annals of the Australian Museum 1893) described a very curious flea, found in the pouch of a native cat (_Dasyurus_) which he called _Stephanocircus dasyuri_. I have since had the typical legless larvae, found also in the marsupial pouch of the same animal, and it is also common upon the bandicoot in Queensland. This flea has an elongate body, with the front of the head flattened and fringed with fine spines; it has no eyes. Skuse is said to have described two species belonging to different genera as the sexes of his flea; and Rainbow in the same journal (Records Aust. Mus. 1905) proposes the name of _Ceratophyllus rothschildi_ for the second. Rothschild has described two other species in this genus, _C. hilli_ from N.S. Wales on the native cat, and a second, _C. woodwardi_, from W. Australia. [Illustration: =Fig. 153.=--_Stephanocircus dasyuri_ (Skuse). Flea of the “Native-cat” and “Bandicoot.” (Original photo. G. Turner.)] Rothschild also describes two other species which he places in Skuse’s Genus _Stephanocircus_, namely _S. thomasi_ (Nov. Zool. X. 1903) from Barrow Island N.W. Australia, and _S. simsoni_ (Entomologists’ Month. Magazine XVI. 1905), which comes from Tasmania, taken upon a native cat, _Dasyurus maculatus_. In the Entomologists’ Monthly Magazine 1906 Rothschild forms a new Genus _Pygiopsylla_ for a large Tasmanian flea taken on a native rat which he calls _Pygiopsylla colossus_. He makes _Ceratophyllus hilli_ the type of this new genus, in which he also places three other Australian species originally described in the latter genus, namely: _C. woodwardi_, _rothschildi_, and _echidnae_, in the new one. Order VIII.--HEMIPTERA.