236 Dr. E. C. L. Perkins on new 



never whitish nor conspicuously parti-coloured, but sometimes 

 tending- to orange. 



The first ab lominal band is in most cases narrow, occupying 

 less than halt' of the dorsal {i. e. non-declivous) pm-tion ot the 

 seo-ment ; the second is alwaj'S narrow and never occuj)ies 

 more than ^ or ^ of the length of tiie second segment. 



With the exception of the ? of one species, which has the 

 propodeum marked with yellow, I think all the forms would 

 fall in the section 27-3-4 of my dichotomous table of Para- 

 lastor recently sent for publication to the Zoological Society 

 of London. 



It is certain that most of these new forms differ little, if at 



■ all, structurally from some of those previously described ; but 



as they differ very greatly in superficial appearance, and 



intermediates are not known, for the present they are better 



kept apart. 



It is almost certain that in Hymenoptera, as in Lepidoptera, 

 a species may assume a totally different appearance in different 

 localities, as it comes in contact with other species of distinct 

 pattern or colour, while specifically it is really unchanged. 

 The material at present collected in Australia is too sparse to 

 allow one to make a satisfactory study of this interesting 

 subject, especially as from large areas no collections at all 

 are available. 



Tiie five forms in question may easily be distinguished by 

 the aid of the following table : — ■ 



Face with a median yellow spot between the an- 

 tennae ; clypeus not deeply but distinctly emar- 

 ginate !• 



Face without this spot ; clypeus truncate or hardly 

 visibly emargiuate 3. 



1. TeguUe black auster. 



Tegulaj pale, yellow or testaceous, more or less marked 



with yellow -. 



2. Apical margin of the clypeus distinctly raised, 



forming a thickened rim ; J tibite dark ; pro- 

 podeum of ^ with yellow spots neochromus. 



Apical margin of the clypeus not distinctly raised ; 

 S tibije pale or rufesceut, sometimes more or 

 less marked with yellow; § propodeum im- 

 maculate lietus, Perkins. 



3. Tegulse conspicuously marked with yellow ; second 



abdominal segment seen in profile with short erect 



hairs aqtiifasciatus. 



Tegulae dark, at most brownish or testaceous in part ; 

 second abdominal segment with thin clothing 

 of long erect hairs all over. ( S antennae 12- 

 jointed.) subj>u>ictulafus. 



