620 



DIPTERA OF AUSTRALIA, 



Head longish-round, flattened, situated deep in the thorax ; 

 front broad, the anterior border produced triangularly in the 

 middle, the point reaching the base of the antennae. Eyes small, 

 round. Ocelli small, the middle one very small, situated in a 

 depression at the base of the frontal triangle. Palpi porrected, 

 arcuated, four-jointed, the first joint very small, the fourth the 

 longest. Antennae almost cylindrical, slender, arcuated, por- 

 rected, 2-4- 14-jointed ; joints of the scapus cyathiform, setiferous 

 at the apex ; flagellar joints cylindrical, somewhat compressed 

 from the side, with a short downy pubescence. Thorax longish- 

 oval, arched, with the anterior border projecting a little over the 

 head, and frequently forming with it an uninterrupted arcuated 

 line ; mesothorax with short hair, not setiferous, only some long 

 hairs at the sides before and behind the orisin of the wines : 

 scutellum semi-circular, setiferous on the border ; metathoi*ax 

 small, somewhat pointed. Abdomen of the ^ with six segments, 

 of the 2 with seven segments, the seventh segment always 

 retracted ; short, broadly compressed from the side, strongly 

 narrowed at the base, truncated at the extremity ; anal segment 

 of the ^ very small, usually entirely withdrawn ; ovipositor of the 

 2 short, small, with two longish-oval lamellte. Legs robust ; coxae 

 and femora broad ; tibiae almost clavate, with strong spurs at the 

 apex ; fore tibiae without lateral spines ; intermediate tibiae with 

 a weak spine on the inner side ; hind tibiae with two rows of strong 

 spines on the outer side ; metatarsi of the hind legs spiuulose. 

 Wings longer than the abdomen, longish-oval, with broadly- 

 cuneiform base, microscopically pubescent. Auxiliary vein in- 

 complete, bent anteriorly, gradually disappearing ; costal vein 

 extending beyond the tip of the third longitudinal, terminating 

 much before the apex of the wing ; the third longitudinal vein 

 arched, running almost parallel with the costa ; the costa and first 

 and third longitudinal veins lying close together ; apex of anterior 

 basal cell not situated beyond the middle of the petiole of the 

 fourth longitudinal fork ; anterior branch of the fifth longitudinal 

 wanting, therefore no fork ; sixth longitudinal vein wanting ; 

 seventh longitudinal very long. 



