90 PROF. M. BEZZI. 



22 (21). Face always with, black spots, or even entirely black. 



23 (30). Wings without anal brown stripe. 



24 (29). A single hypopleural spot. 



25 (26). Wings without apical spot at the end of the third vein, with a black 

 stigma only ; face wholly black ; abdomen and ovipositor entirely black, the 

 former with fused segments 12. inornatus, Bezzi. 



26 (25). Wings with a distinct apical spot ; face with the two usual black spots ; 

 abdomen reddish, with or without black spots. 



27 (28). Apical spot of the wings isolated ; thorax dark brown, with the middle 

 scapular bristles distinct ; abdominal segments separated. . 13. oleae, Gmel. 



28 (27). Apical spot united with a narrow but distinct black fore border ; thorax 

 rufous, like the whole body, with indistinct middle scapulars ; abdominal segments 

 fused 14. rufus, sp. n. 



29 (24). Two contiguous hypopleural spots ; body elongate ; abdomen with 

 fused segments and very long cylindrical ovipositor ; middle scapular bristles 

 not distinct ; wings with a yellowish fore border and a grey apical spot. 



15. longistylus, Wied. 



30 (23). Wings with a distinct anal brown stripe. 



31 (34). A single hypopleural spot. 



32 (33). Fourth longitudinal vein straight ; only a brown cloud at the end of the 

 anal vein 16. brevis, Coq. 



33 (32). Fourth vein strongly bisinuous ; a brown stripe on the anal vein. . . . 



17. brevistylus, Bezzi. 



34 (31). Two contiguous hypopleural spots. 



35 (38). Last portion of the fourth longitudinal vein S-shaped, distinctly bent 

 forwards before reaching the costa ; apical spot surpassing the third vein ; anal cell 

 infuscated on the disc ; species of greater size. 



36 (37). The brown apical spot of the wings united with a brown fore border ; 

 middle scapular bristles rudimentary 18. vertebratus, Bezzi. 



37 (36). A grey apical spot separated from the yellowish fore border; middle 

 scapulars strongly developed 19. marginalis, var. n. 



38 (35). Fourth longitudinal vein perfectly straight towards the end, only slightly 

 bent at base ; wings with a blackish stigma and with an isolated apical black spot, 

 almost surpassing the third vein ; anal cell wholly hyaline ; no middle scapular bristles ; 

 species of smaller size, hardly surpassing 5 mm 20. ficicola, sp. n. 



Subgenus Tridacus, no v. 



1. Tridacus lounsburyi, Coquillett, 1901 ; Froggatt, 1909 ; Silvestri, Boll. Lab. 

 Zool., Portici, viii, 1913, p. 91, fig. xxv, and Div. Ent. Hawaii, Bull. 3, 1914, p. 91, 

 pi. viii, fig. xxv. 



A large and very distinct species, originally described from Cape Town and Wynberg, 

 Cape Colony. I have seen the specimens collected by Prof. Silvestri at Kirstenbosch,. 

 Cape Colony. Enderlein (1911) records the species from Tanga, German East Africa, 

 and even from Madagascar ; but I think that the present species has probably been 

 confused with others of the same group. 



