BY E. W. FERGUSON. 693 



Section i. — No median ventral vitta, apical segment channelled in 



the <S Group 1. — Adelaidce-group. 



Section ii. — Median ventral vitta present. 



A. Fifth interstice strongly tuberculate throughout. 

 B. Intermediate tibiae not notched within apex. 



C. Third interstices convergent on declivity 



Group ii. — sahnlosus- grouip. 



CC. Third interstices subparallel on declivity 



Group iii. — Stutchbnryi-gronp. 



BB. Intermediate tibiae with strong subapical notch 



Group i V. — suhcostatus-grouTp. 

 AA. Fifth interstice only tuberculate near humeral angle, or with 



only a few isolated tubercles Groi;p v. - vestitus-gioup. 



It is sometimes difficult, with single specimens, to determine 

 the group to which they properly belong; for instance, members 

 of the AStutchburyi-group may show some deficiency in the tuber- 

 culation of the fifth interstice, this being, in most cases, an 

 individual variation, and readily corrected by the examination 

 of a series. Besides the members of the subcostatus-gvoup, a 

 number of other species possess intermediate tibiae with subapical 

 emargination; some of these are members of the first Section, 

 but others belong to the vestitus-gvonp, and are separated from 

 the members of the subcostatus-grouip by the character of the fifth 

 interstice. *S'. convexus, S. insignis, and S. noctis, I have placed 

 in the sabidosus-gvouY^, though they should, perhaps, constitute 

 a separate subdivision; and, in places, I have alluded to these 

 three species as the convexus-gvo\\Y>. 



The only species which do not lend themselves readily to this 

 grouping are three in number. 



1. »S'. albovittatus Ferg., a species in general facies resembling 

 the vestitus-gTow'p, but probably an aberrant member of Section i. 



2. S'. horridus MacL, apparently related to the vestitus-grow'p, 

 but falling, according to my tabiriation, into the Stutchburyi- 

 group. 



3. S. RiverincB MacL, a species with a ventral surface not 

 vittate nor maculate. Possibly it is not really a Sclerorinus. 



Distribution. — While the majority of the species are inhabit- 

 ants of the Eyrean subregion, in Victoria a number of species 



