698 REVISION OF THE AMYCTERIDES, iv., 



of the insect. S. Waterhousei is the largest and most conspicu- 

 ously tuberculate, but grades down into S. Adelaidce; this latter 

 species, in turn, runs into S. vittatus, without any apparent line 

 of demarcation. 



Under S. vittatus, I have grouped a number of forms, most of 

 them represented by single specimens, differing in the size and 

 conspicuousness of the tubercles; among these are included S. 

 «onspersus, S. fuscus, and the form previously identified by me 

 as S, sordidus. In view of the transition between the various 

 forms, it is questionable whether they should not be regarded as 

 constituting but one variable species; the extremes of the series 

 are, however, very distinct; and I have thought it better to 

 retain the names of the principal forms. It is possible that 

 further collecting will show that some of the varieties, at present 

 included under S, vittatus, are worthy of specific rank. There 

 are, of course, one or two species with symmetrical tarsi, that 

 are quite distinct. 



The species with the third anterior tarsal joint asymmetrical 

 are in a somewhat better position, though considerable confusion 

 has, in the past, existed about them. S. tristis, I regard as 

 typical of these species, and, with it, I unite S, Howitti and S. 

 asper as synonyms. S. sordidus and S. acuminatus, I regard as 

 sexes of the same species, and separate them from S. tristis. S. 

 inornatus is also distinct from S. tristis. The position of S. 

 obliteratus is still open to question; the type is a female, and 

 differs from the female of S. tristis in the structure of the apical 

 ventral segment. There are two species before me, which possess 

 a similar structure; one is S. inornatus, which has a more ob- 

 literate sculpture; and the other is a species from the Victorian 

 Alps, which is rougher, but shows considerable variation in this 

 respect. Tentatively, I regard this species as S. obliteratus, but, 

 as the male has simple tarsi, it should come in the first portion 

 of the Group. It is possible that ;S^. obliteratus will be sunk 

 ultimately as a synonym of S. Spencei Bohem. 



In addition to the species described in this paper, I have seen 

 a number of others, differing in various features, and represented 



