110 DIPTERA OP AUSTRALIA, 



cross-vein ; second posterior cell with a short petiole or sessile. 

 Front tolerably broad, with a slight gibbosity above the base of 

 antennae. Rostrum shorter than the head, with a distinct hairy 

 nasus. Antennae 12-jointed in ^, 14-jointed in 9 ; short, with a 

 certain number of terminal linear joints which are beset with 

 bristly hair. Palpi with the last joint long, flagelliform. ^ forceps 

 of rather simple structure ; valves of 9 ovipositor straight and 

 slender. 



Rostrum half the length of the head ; nasus prominent, hairy ; 

 palpi with the first three joints progressively increasing in length, 

 the fourth as long as or longer than the preceding three taken 

 together. Antenme longer than the head and rostrum combined, 

 very little longer in A. monticola, about the length in A. inornata; 

 12-jointed in ^, 14-jointed in ^ ; first five to seven flagellar joints 

 diminishing in size, the remaining terminal joints lineai', adorned 

 with tolerably long stiff" hairs ; \n A. Sydneyensis the first seven 

 flagellar joints in ^, and the first six in the 9, give the antennge 

 a serrate appearance beneath; the first five in A. monticola less 

 so (PI. VI., fig. -42). Front tolerably broad, with a slight gibbosity 

 above the antennae in A. Sydneyensin and A. monticola, scarcely 

 perceptible in A. inornata. Collare slightly prolonged into a 

 neck. Thorax rather elongate ; suture distinct. Abdomen slender 

 and elongate ; ^ forceps not incrassate, of rather simple structure 

 (PI. VI., figs. 41, 41a) ; 9 ovipositor with straight, slender valves 

 Legs long and slender ; fore and intermediate tarsi twice the 

 length of the tibiae, in the hind legs less, on account of the greater 

 length of the tibiae ; tibial spurs small (I cannot detect any on the 

 fore tibiae) ; ungues small, curved, dentate, smooth in A. inornata 

 (9) ; empodia very small, linear. The wings are considerably 

 longer and broader in the 9 than in the ^ ; the anal angle is 

 distinct. Anterior branch of second longitudinal vein oblique, 

 the second longitudinal joining it near the origin ; second sub- 

 marginal cell longer than first posterior, their inner ends obliquely 

 in line and forming almost a right angle with inner end of discal 

 cell ; the latter longer than broad, pentangular ; second posterior 

 cell long, with a short branch ; sessile in A. inornata ; fifth 



