118 DIPTERA OF AUSTRALIA, 



3-3,500 ft., (Helms), several sj^ecimens in Coll. Australian Museum. 

 March. 



Ql)S. — With the assistance of Baron Osten-Sacken's note 

 (Studies T, p. 176) on this species I cannot help concluding that 

 the above-described is Walker's rtUogyna par. 



419. IscHNOTOMA RUBRivENTRis, Macquart. (PI. v., fig. 19.) 



Tijnda rubriventris, Macq., Dipt. Exot. Suppl. I., p. 14, pl. 1, 

 fig. 9, 1846. 



^. — Length of antennpe -100 inch ... 2-54 millimetres. 



Expanse of wings 0-720 x 0-150 ... 18-28x3-81 



Size of body 0-600x0-080 ... 15-24x2-02 



^. — Length of antennae 0-100 inch ... 2-54 millimetres. 



Expanse of wings 0-720x0-170 ... 18-28x4-31 



Size of body 0-640x0-090 ... 16-25 x 2-27 



Head slate-grey, with a dark median stripe on the front ; frontal 

 tubercle bright fulvous; rostrum black, fulvous at the sides; 

 suctorial labella, palpi and antennae black ; first joint of scapus 

 scarcely | longer, but thicker, than first flagellar joint ; second to 

 ninth flagellar joints rounded beneath, progressively diminishing 

 in length ; terminal two joints small. Collare dull fulvous with a 

 brown spot. Thorax hoary grey, almost completely covered by 

 three confluent black stripes ; the intermediate stripe cuneiformly 

 ' narrowed to the suture, its margins and a median line of deeper 

 black, also two short slate-grey lateral stripes posteriorly ; lateral 

 stripes short, connected with the intermediate one at about the 

 middle of its length ; the humeral pits, transverse suture, a large 

 spot above origin of wings (behind suture), and the sides and 

 posterior borders of scutellum and raetanotum, black ; also a more 

 or less distinct black median line from suture, across scutellum and 

 metanotum. Halteres fulvous, the club brown or black. Abdo- 

 men fulvous, levigate, with a black band on the posterior margin 

 of second to seventh segment ; yellowish -grey laterally ; genitalia 



