82 DIPTERA OF AUSTRALIA, 



marginal cell in contact with discal cell, the small cross- 

 vein wanting ; second posterior cell sessile. Front modei'ately 

 broad, with a distinct tubercle above the antennae. Rostrum 

 shorter than the head ; nasus wanting. Antennae 13-jointed in 

 ^, 15-jointed in ^ ; flagellar joints in ^ vvith three rows of very 

 long branches, in 9 with two rows of very short ones. Genitalia of ^ 

 not incrassate, of simple structure ; the basal piece bearing a 

 curved, horny, pointed, appendage, with a fleshy lobe beneath. 

 (PL VI., fig. 28.) 



The male antennae (PI. vi., fig. 29) have the first flagellar 

 joint short with a single long branch beneath ; the second to 

 seventh with a long branch on each side at the base and another 

 at the middle beneath; the eighth joint is considerably longer than 

 the seventh, has the usual two basal branches, but the third is 

 short and situated near the aj^ex beneath. Westwood's figure of 

 the (J antennae (Trans. Ent. Soc. 1881, pi. xix. fig. 14a) shows 

 exactly their character. The female antennae have only a very 

 short tooth-like branch beneath on the first flagellar joint, the 

 second to eighth with a short branch on each side at the base, 

 those on the outer side nearly twice the length of those on the 

 inner ; five short, simple, terminal joints. Westwood says that 

 the 9 antennae are 14-jointed, but I can distinctly see five ter- 

 minal joints. The terminal joints, however, may be subject to 

 modification. 



The valves of the 5 ovipositor are straight and pointed. 



The first longitudinal vein sometimes terminates in the anterior 

 branch of the second longitudinal vein, though more often imme- 

 diately before its base. The complete contact of the second sub- 

 marginal and discal cells is constant in all specimens examined. 



397. Ptilogyna ramicornis, Walker. (PL iv., fig. 6.) 

 Tijmla ramicornis, Walk., Ent. Mag. II. p. 469, 1835 ; Ftilo- 

 gyna ramicornis, Westwood, Lond. and Edin. Phil. Mag. VI. p. 

 280, 1835 ; P. marginalis, West., Zool. Jouin. V. p. 448, pi. 22, 

 figs. 14-15, 5, 1835 ; P. fuliginosa, Macquart, Dipt. Exot. I. p. 

 46, pi. 3, f. 2, 1838 ; P. Ifacqnarti, Loew, Linn. Entom. V. p. 



