from the Philippine Islands. 221 



Ptilona); 3. six bristles on the scntellum, the intermediate pair being 

 smaller (Ptilona has only four); 4. the tip of the first vein is in the 

 middle or beyond the middle of the distance between, the tips of the 

 auxiliary and second veins (it is before that middle in Ptilona) ; 5. the 

 section of the third vein before the anterior crossvein is microscopically 

 bristly (glabrous in Ptilona). 



Mr. V. d. Wnlp has noticed the probable relationship between 

 Ptilona and Rioxa (Tijdschv. etc. XXIII, 183, at the bottom), and some 

 of the above-quoted differences (No, 1 and 4) have been indicated by 

 him in the description of his Ptilona SCXmaculata; I infer therefrom, 

 that P. seccmaculata would be better placed in the genus Rioxa. 

 Rioxa, on account of the presence of a praesutural bristle, would seem 

 to be nearer to Trypeta (in the sense of Meigen), than Ptilona. Prof. 

 Rondani (Ann. Mus. Civ. Gen. VII, 436) has described some species 

 of Rioxa from Borneo. 



There is a small species Trypeta paritii Dol. 1 Bijdr. 10, Tab. I, 

 f. 2. (I have little doubt that it is the same as T. modesta Wied. 

 A. Z. II, 496), ') which, in the design of the wings, resembles a Ptilona. 

 But it has a praesutural bristle, 6 long bristles on the scutellum and 

 the third vein microscopically bristly. From Rioxa it differs in having 

 the arista plumose on both sides, the first longitudinal vein shorter, 

 third antennal joint shorter; the general shape of the body is also 

 diiferent. T. paritii is a true Trypeta, in Meigen's sense, although 

 I would hesitate to place it in any one of the existing subdivisions. 



Riooea sp. A fragment of a male; the species is different from 

 the preceding. 



Trypeta metaleuca Wk. J. Pr. Lin. Soc VII, 238. (North 

 Ceram; Comp. 0. S. Enum. 71). Belongs in the Subg. Acidia. 



Trypeta Eli mi a Wk. List etc. IV. 1033 (Philippine Islands). 

 The description is recognizable; the locality being the same, the iden- 

 tification is certain. Ortolis regularis Dol. 3 Bijdr. 47 (Amboina) is 

 the same species. 



Trypeta stellata (Syn. Acinia stellata Macq. D. E. Suppl. IV, 

 293; Manilla). I have seen the type in Mr. Bigot's collection. Macquart's 

 short description does not quite apply, unless ,,bande dorsals brune'' 

 is read, in the plural, and not in the singular, and „base jaunatre" is 

 put, instead of brunatre. T. stellipennis Wk. J. Pr. Lin. Soc. IV, 159 



') The „Borste ungefiedert" in Wiedemann does not agree; but is 

 that statement correct? 



