r,\ A. L. TONNOIK. 59 



ADULTS. 



Table For Male and Females. 



1. Antennae loner, nearly as long as the body, or at least, 



as the abdomen; basal joints of flaffellum 

 elongated and scarcely distinct from each other; 

 r-m placed well before fRs. 3. 



Antenna' rather short, about as long as thorax ; the 

 basal joints of the flageilum somewhat fusi- 

 form, well distinct from each other; r-»i placed 

 at or after fRs. 2. 



2. Mesonotum nearly all orange; front legs rather 



dark; stem of Ro ^. 3 much longer than Ho. 

 smaller species. " D. FLAVICOLLIS, 'n.sp. 



Mesonotum with three well-marked dai'k bands; all 

 legs yellow with dark tip at femora and tibia' ; 

 stem of Rj . .J somewhat shorter than |,'^. 

 larger species.' D. GENICULATA~ n.sp^ 



3. No other marking on the wing but a spot on r-m 



which extends along the stem of Rs up to K, . 

 mesonotum orange with two dark bands con- 

 nected in front. D. TASMANIENSIS, n.sp. 



Wing spot never extending up to Rl ; or else wing 

 nebulous and colouration of mesonotum ni'ariy 

 all black. 4. 



4. Besides the roundish spot around r-m the wings 



are infuscated on some other pai'ts, chiefly on 

 the apical region; nearly completely dark 

 species. /). HVMKRALIS, n.sp. 



Wing pi-esciiting only one spot near r-)n or scarcely 



any trace of one. 5. 



5. The spot of the wing distinctly marked, rather large. 



extending on the whole length of the .stem of 

 Rs. D. VNIMACVLATA, n.sp. 



The spot of the wing very faint, restricted only along- 

 side r-m D. NICHOLSON I, n.sp. 



