BR. J. ENT. NAT. HIST., 6: 1993 161 



3 Abdomen dark with rounded dull yellow patches at the sides of each tergite, 

 often ill-defined. Proepisternum without setulae midway between the coxa and 

 postpronotal lobe (do not confuse with setae on the anterior edge of these lobes, 

 cf. Fig. 4g). Dorsal setae on last abdominal segment of the male short, weak and 

 placed midway along the segment so that they do not extend beyond the segment; 

 male cerci evenly curved in lateral view, ending in a flattened point, without tiny 

 black spines (do not confuse with tips of the surstylar lobes) (Fig. 2a). Tip of 

 ovipositor ends above the median line in lateral view, the upper and lower halves 

 not being symmetrical images (Fig. 5b) O. germinationis (L.) 



— Tergites yellow with dark central and lateral stripes, the central stripe never spreading 

 sideways along the posterior margins of the tergites. Proepisternum with several 

 setulae midway between the coxae and postpronotal lobe (Fig. 4g). Dorsal setae 

 on the last tergite of the male long, placed near to its tip and extending well beyond 

 the segment; cerci strongly angled in lateral view, ending in a blunt tip with numerous 

 short black points (Fig. 2b). Upper and lower halves of the ovipositor are almost 

 symmetrical images so that it appears rounded and blunt (Fig. 5c)0. petrel Mesnil 



4 Wings with only four distinct dark marks comprising an apical spot, one 

 on each crossvein and one midway along the last section of vein M (Fig. lj). 

 (The last section of vein R 4+5 may be slightly clouded but this does not form 

 a distinct spot) O. florum (F. ) 



— In addition to the four wing marks, there are distinct round spots either along 

 the last section of vein R 4+5 or in the basal radial cell before the r-m crossvein 

 (Figs Ik, n, o) 5 



5 Thorax with a dark central stripe. Vein O^ and the adjacent membrane conspi- 

 cuously dark (Fig. In) O. lineatopunctata von Roser 



— Thorax without a dark central stripe. Membrane adjacent to vein CuA, virtually 

 clear 6 



6 Vein R 4+5 without any spots or extra crossveins proximal to the r-m crossvein; 

 apical spot continuous between the ends of the long veins, even if only faintly 

 so (Fig. Ik). Prosternum (between the front coxae) with numerous setae. (Apart 

 from extra spots on the last section of R 4+5 this species resembles florum) 



O. punctata Haliday 



— Vein R 4+5 with clouds, with or without underlying extra crossveins, in the basal 

 cell behind the first section of R 4+5 ; apical spot comprising separate clouds 

 on the ends of R 2 + 3 and R 4+5 (Fig. lo). Prosternum with about three setae on 

 either side O. punctelta Fallen 



7 Wing with large conspicuous dark spots on both crossveins (Figs lh, i). Acrostichal 

 setae in 6-8 rows at the level of the transverse suture 8 



— Any shading on the crossveins is weak and restricted compared with the apical spot, 

 and usually not extending appreciably beyond the long veins (Figs 1 a-g). Acrostichal 

 setae in 4, or sometimes 6, rows at the level of the suture 9 



8 Anepimeron with one strong seta in addition to 1-2 weak setae (Fig. 40. 

 Wing usually with a distinct spot at its base, spreading from near the end of R, 

 and covering the fork of R 2 + 3 and R 4+5 but if faint then at least the extreme 

 base of R 4+5 itself is darker at the fork than on most of its length (Fig. li). 

 Surstylar lobes slender with a straight posterior margin in lateral view; cerci 

 extend almost to the ends of the lobe (Fig. 4a). Sternite 8 of female terminalia 

 entire (Fig. 5j) G. tripunctata Fallen 



— Anepimeron with 3-5 setulae only (Fig. 4e). No discernible spot covering the tip 

 of R! and the fork of R 2 + 3 and R 4 + 5 and the veins here not darker than on most 

 of their length (Fig. lh). Surstylar lobes large and broadly rounded with a curved 



