BY THOMAS G. SLOANE. 433 



Hah. — Namoi River, N.S.W. (I found this species plentiful 

 at Carrol on the Namoi, 12 miles above Gunnedah.) 



The 9 has the interstices of the elytra less convex than the 

 (J, and slightly subsericeous or opaque. The coluur of the elytra 

 in both sexes seems rather a deep blue-black than a true black. 



It belongs to the Ceneus group of the genus. It may be 

 distinguished from P. {Ceneus) chalybeipennis, Chaud., by its 

 smaller size, narrower form, the less convex interstices of the 

 elytra, and by the shape of the prothorax, which is less transverse, 

 being less dilatate at the anterior marginal punctures and less 

 narrowed posteriorly. 



JVute. — I had formerly thought this species might be the one 

 described by de Castelnau as Ilarpalus quadraticollis, which is 

 said by de Chaudoir* to be a Rormochilus ; but besides its not 

 agreeing with the description of II. quadraticoUis, I have a 

 specimen of a Hormochilus from Southern Queensland, which I 

 believe to be de Castelnau's species. My Southern Queensland 

 species is identical (from comparison with type) with the species 

 that Sir William Macleay took to be Setalis niger,f Casteln ; 

 it is a winged insect, as is also Hormochilus monochrous, Erich., 

 from examination of a specimen from Melbourne in my col- 

 lection. 



Setalimorphus, n.gen. 



Labruin lightly emarginate. 



Mentum not deeply emarginate ; lobes short, very oblique on 

 inner side ; median projection short, wide. 



Labial palpi with last joint thick, truncate. 



Prothorax subquadrate ; two basal impressions on each side. 



Elytra deeply striate ; 3rd interstice unipunctate on apical 

 third ; shoulders dentate. 



Prosttrnum margined at base. 



Matastemal episterna (with epimera) about as long as wide, 

 hardly narrowed posteriorly. 



* Ann. Mus. Civ. Genov. 1878, xii. p. 475. 

 t See note on Setalis, ante p. 416. 



