118 C R. Osten Sacken: Diptera 



The proboscis seems to be of different length in different species; 

 the labella are long, slender and apparently very movable. 



The species inchisa, gibhula, meliponaeformis and brevirostris 

 (Arista bare, or microscopically pubescent) are very much alike in 

 coloring, and differ chiefly in the color of the scutellum and of the 

 legs. In the same way G. ventralis, microdon, and some undescribed 

 species form a natural group, provided with a plumose arista. But 

 6r. tibialis Wk. is said to have a plumose arista, although, on account 

 of its coloring, it would belong to the first group; O. interrupta Wied. 

 on the contrary, is said to have a bare arista, although its coloring 

 would refer it to the second group. And thus a natural grouping 

 cannot to be arrived at. For this reason I do not make use of the 

 genus Baryterocera Walk. J. Pr. Lin. Soc. I, 123, Tab. VI, f. 4 

 with the species inclusa (Borneo) for type, which must be very like, 

 if not the same, as O. brevirostris Wied. 



The following table is prepared principally from descriptions and 

 is therefore liable to error. 



Synopsis of the Graptomyzae of the Indo-malayan Archipelago. 



Arista bare (or microscopically pubescent). 

 Wings with black crossbands or spots. 

 Femora black. 



Scutellum black gibbxda Wk. 



Scutellum yellow, w. black margin . meliponaeformis Dol, 

 Femora yellow, with black tips. 



brevirostris W, 

 inclusa Wk, 

 Wings without black bands or spots. 



Prevailing color of the abdomen black interrupta W. 

 Abdomen yellow, with a brown cross- 

 band and brown spots .... literata u, sp. 

 Arista plumose. 



Abdomen without longitudinal black stripes, 

 A black stripe on the rostriform pro- 

 longation of the face. 



Femora yellow ventralis W. 



Front femora with black bands , , tibialis Wk, 

 No black stripe on the rostriform pro- 

 longation microdon n, sp. 



Abdomen with longitudinal black stripes. 



Abdomen with more than three stripes longirostris W. 

 Abdomen with three black stripes . . lineata 0. S, 



