DTPTERA. 85 



In these descriplioiis I have separated from Dasypogon the following 

 six genera, which, with the exception of the first, are characterized ; Me- 

 gapollyon, Cabasa, Prolepsis, Euarmostus, Pseudorus and INIorirana. 



Nusa, Acurana, Scandon and Chaerades, are allied to Laphria ; Phellus 

 is allied to Mallophora ; Cormansis to Atomosia ; and Pheneus is most 

 remote from the general structure of the family. 



Genus DIOCTRIA, 3Iei(/en. 



DiocTRiA Tasmanica, Sauiulers^ 3ISS. 



Fern. Nigra, thoracis laterihus pectoreque ferrwjincis, ahdomine piceo 

 laterihus ferrugineis, antennis pedibusque niyris, tibiis basi flavis, 

 alls limpidis fusco vittatis et maculatis. 



Body black, shining : head clothed with black hairs and bristles, 

 adorned in front and behind with a hoary covering ; two black triangular 

 spots on the face ; epistoraa adorned with a row of white bristles : sucker 

 black, clothed with black hairs : eyes' black ; fore part rather fl.at, all the 

 facets small : sucker black, clothed with black hairs ; palpi black, beset 

 with black bristles : feelers black, much longer than the head : chest fer- 

 ruginous on each side: breast ferruginous, adorned with a hoary covering : 

 abdomen pitchy, ferruginous along each side, thinly clothed with short 

 hoary hairs, more thickly covered with longer hairs at the tip beneath, 

 much more than twice the length of the chest, slender and linear near the 

 base, spindle-shaped and a little broader from thence to the tip : legs 

 black, clothed with very short black hairs, bcsel with a few black bristles ; 

 shanks bright yellow towards the base ; foot-cushions tawny : trings co- 

 lourless, broivn along the fore border to the tip, where this band is forked, 

 it includes in the middle part of its length a colourless streak, beneath 

 rvhich there is a large irregular darker broivn spot; wing-ribs and veins 

 black ; poisers bright pale yellow. Length of the body 7 lines ; of the 

 wings 14 lines. 



Van Diem en's Land. 



