BY THOMAS G. SLOANE. 253 



Attention ma}^ be drawn to the following features which vary, 

 and which are useful in aiding the determination of species : — 

 Head : size, convexity, length of mandibles, &c. 

 Prothorax : shape, convexity, comparative width of base and 

 apex; disc, if opaque or nitid; sides sinuate or not before 

 base, form of basal angles, nearness of anterior angles to 

 head; position of posterior marginal puncture (an important 

 classificatory character) ; width of border, especially near 

 base; etc. 

 Elytra: shape, convexity, sinuosities of apex, striation; interstices 

 (opaque or nitid), convexity, punctures of third, form of eighth 

 (a valuable classificatory character); humeral angles dentate 

 or not; reflexedness of lateral border near base. 

 Frosternum and mesosternum : shape of intercoxal declivity 

 (this seems a constant and useful character for grouping the 

 species in Notonomus). 

 Metastermim : episterna long, or short. 



The habitats of the species of Notonomus are among the heavily 

 timbered districts of South Eastern Australia. The range of the 

 genus extends from about the Grampian Mountains in Western 

 Victoria, along the coastal districts of Eastern Australia as far 

 north as the Burnett River. Only one species is authentically 

 known to me from north of the Burnett River, A single species 

 {N. mediosulcatus, Chaud.), not closely allied to any other, is 

 found in South Western Australia. Probably owing to their 

 being apterous, and frequenting heavily timbered mountainous 

 districts, the species seem usually restricted in their range. No 

 species from north of the Clarence River is known to me as being- 

 found as far south as Sydney, nor, as far as I know, is any species 

 from Sydney to be found about Melbourne. 



Dejean first described species belonging to the genus Notonomus 

 (viz., three species in the year 1828). Then followed Count de 

 Castelnau with two species {Trigonotoma violacea in 1834,* and 



* Chaudoir reported after inspection of the type (Ann. Soc. Ent, Belg. xi., 

 p. 162) that T. violacea, Casteln., was a species of Notonomus, and this has 

 recently been confirmed by M. Tschitscherine (Hor. Soc. Ent. Koss. 1902, 

 XXXV., p. 534). 



