BY THOMAS G. SLOANE. 623 



F. interioris, Casteln.; and F. suhyayathia, Casteln. Of thesse I 

 believe I have recognised two wliich may be distinguished from 

 one another thus : — 



Elytra with interstices depressed, inner humeral angle 



open P. iridipennis. 



Elytra with interstices convex, inner humeral angle 



sharply marked P. suhgagathms^^} 



PSEUDOCENEUS IRIDIPENNIS, Castehl. 



Feronia (Pcecilus) iridipennis, Casteln., I.e., p. 217. 



Provisionally I attribute to this species all the forms known to 

 me with the elytral interstices depressed, but would draw atten- 

 tion to the varying width of the base of the prothorax, which 

 leads me to suppose I have more than one sjDecies before me. I 

 append some measurements : — 



(1) 9. Length 10; proth. 2-5 x 2-85, apex 2-15, base 2-5; eL 

 6-5 X 4-3 mm. Log. — Neighbourhood of Melbourne (Sloane). 



(2) Length 11-5; proth. 2'5 x 3, apex 2-1, base 27; el. 6-8 x 

 4*4 mm. Loc. — Mulwala, Murray River (Sloane). 



(3) 9. Length 11-5; proth. 2-75 x 3-2, apex 2-2, base 3; eL 

 7*1 X 4-5 mm. Loc. — Sydney (Sloane). 



I have suspected the Melbourne form may be Fero7iia (Poecilus) 

 iridescens, Casteln., more especially as I have it noted as identical 

 with Calathtis iridescens (Macleay, W. S., MSS.) of the Howitt 

 Collection. If this be P. iridescens, Casteln., then probably the 

 Murray River species is F. iridipennis, Casteln. Possibly the 

 Sydney form may represent P. interioris, Casteln., but this species 

 cannot be identified except from specimens from the Paroo River, 

 the original locality. 



It is remarkable and worthy of note that Messrs. Blackburn,"^ 

 Tschitscherine,! and myself! have all independently arrived at 



* Proc. Linn. Soc. N.S.W., (2) iv., p. 731, 1889, and (2) vii., p. 9o, 1892. 

 t Hor. Soc. Ent. Ross., xxv., 1891. 



t Trans. Roy. Soc. S. Aust., xix., p. 129, 1895; and Proc. Linn. Soc. 

 N.S.W., xxiii., p. 480, 1898. 



