682 AUSTRALIAN BATRACIIIA, 



of Nickol Bay. Of the Batracliia inhabiting the considerable 

 interval between Geraldton and Nickol Bay we are quite ignorant. 

 In the present state of our knowledge the western species may 

 then be arranged in two geographical subdivisions, a south- 

 western group, and a north-western group. Where, or to what 

 extent, these two faunas overlap or commingle we do not know. 

 Our knowledge of both of them, and especially that of the north-west 

 must be very far from being complete, for three south-western 

 species occur also at Port Essington without being known as yet 

 from any intermediate locality. 



((/) The south-western group : — 



Li'innodynates dorsalis, Crinia yeorgiana, C. sigtii/eta, C. leaiy 

 Hyperolia marmorata (? ), Heleioporiis albopunctatus, Pseiidophryne 

 ausb'alis (I), P. gueiiiheri, Myohatrachus gouldii, Ilyla rubella, 

 H. eivingii var. calliscelis, H. adelaidensis, H. aurea (11 -f 2 f). 



(6) The north-western group : — 



Limnodynastes ornatus, Chiroleptes a'listralls, C. albuyutt.atnn, 

 C breA'ipahnatus, PseAidophryne guentheri, Hyla caern/ea, //. 

 2)eronii and var. rothii, II. latopalmafa (8). 



It is convenient to add here for comparison a list of the species 

 known from the Northern Territory (Port Essington and the Daly 

 River), compiled from the B.M. Catalogue, with the addition of 

 C. dahlii, recently described by Mr. Boulenger from the Daly 

 River (P.Z.S. 1865, p. 857) :- 



Liiniiodynasies dorsalis, L. ornatus, Crinia georgiaud, Chiro- 

 leptes australis, C. daldii, Heleioporus albopunctatus, Hyla 

 freycineti, H. ttasata, II. rubella, H. pKronii, II . adelaidensis, U . 

 aurea, II. coividea, H. affinis, Hylella bicolor (15). 



The .first or south-western group is characterised b}^ (1) the 

 poor representation of the two dominant genera Limnodynastes 

 and Hyla, or indeed of any genus except Crinia, which is not 

 numerically strong in species; (2) by a poverty of peculiar genera 

 (one) and species (two, C. leai, and M. gouldii) ; and (3) by the 

 absence of Chiroleptes, a characteristic which it shares in common 

 with the south-eastern fauna. Four of the species (including a 

 varietal form) are represented in Tasruiania and Victoria; three 



