BY E. W. FERGUSON. 785 



much feebler, not hirsute, tibiae with much feebler emarginations. 



Dimensions: $, 17 x 6*5; 9, 17 x 7 '5 mm. 



Hab.—^.^^N.'. Grenfell (T. G. Sloane and E. W. Ferguson). 

 Type in Coll. Ferguson. 



I do not think that this species can be confused with any pre- 

 viously described one. S. subsequens is its nearest ally, but differs 

 in the rather larger, prothoracic granules, and in the elytral 

 sculpture, to some extent. It is, of course, possible that S. dolens 

 Boisd., may prove to be this species. 



Group V. 



Fifth interstice typically tuberculate only at the base, or more 

 feebly tuberculate than on the other interstices. 



The species constituting this Group may be further subdivided 

 into four Subgroups. 



Subgroup A contains the more typical species of the Group, 

 and comprises a number of closely allied species often difficult to 

 separate, in many cases, leading into one another. S. loiigus, S. 

 vpstitns, and *S'. Stewarti are undoubtedly closely allied, but I 

 have regarded them as distinct; S. tctniatus Pasc, is a synonym 

 of ^S. Steioarti Macl. S. pilular'ius Macl., is closely allied to S. 

 sjtblinpatus Macl., and S. alpicola Ferg., to S. inconstans Lea. 



Subgroup B contains but a single, named species, S. exilis. I 

 have specimens of it from Widgiewa and Condobolin; but the 

 specimens from the latter place differ in some respects, and might 

 be regarded as distinct, or, at least, as a variety. 



The Subgroup has the tubercles on the elytra all separated, and 

 they are present at intervals all along the fifth interstice. On 

 this account, it might be thought advisable to remove this species 

 from the Group, but it is, in other respects, so closely allied to 

 the other members, that I have not thought it necessary. 



In Subgroup C, the tubercles are closely set on the third and 

 sixth interstices, and few or absent on the others. The third 

 interstices are also approximated on the declivity. So far, only 

 two species fall into this Subgroup, S. biordi7iatus Macl., and *S'. 

 Blackburni Ferg., found on opposite sides of Spencer's Gulf. 



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