froini the Philippine Islands. 115 



Halteres yellowish brown. Legs brownish-yellow; proximal half of the 

 middle tibiae infuscated; hind legs brown, except the proximal half 

 of the tibiae which is yellowish; underside of the hind femora, on their 

 distal third, beset with a row of rather long hairs. The usual bristles 

 on the hypopygium comparalively short. Wings brownish , especially 

 between the fourth vein and the costa; third and fourth veins parallel, 

 the last section of the fourth is nearly straight, the flexure a little 

 before its middle being almost obsolete; posterior crossvein almost in 

 the middle of the wing. — Two males, 



NB. Diaphorus resumens Walk. J. Pr. Lin. Soc. Ill, 93 (Aru 

 Isl.) is apparently a mixture of two different species; the female may 

 perhaps be the same species as my D. maurus. 



Syrphidae. 



Syrphus striatus v. d. Wulp, Sura. Exp. 32, Tab. H, f. 3. 

 Three males. 



It is almost impossible to determine the species of the difficult 

 group of S. ribesii (to which the present species belongs), without the 

 comparison of typical specimens; nevertheless I am almost sure of my 

 identification, owing to Mr. v. d. Wulp's excellent description and figure. 

 The abdomen is a little broader in my specimens, than the figure 

 shows it to be, and the scutellum has, on its hind margin, a conspi- 

 cuous fringe of black hairs, which I perceive in the figure although it 

 is not mentioned in the description. The specimens were named by 

 Mr. Walker S. consequens Walk. J. Pr. Lin. Soc. I. 18 (Singapore); 

 that they disagree from the description is attributable, I suppose, to 

 its careless wording rather than to a mistake in the identification. 



Syrphus, two species, both of the group of S. balteatus, but 

 neither is identical with this species. South Eastern Asia seems to 

 contain several species belonging in this same group, such as S. nec- 

 tarinus W. A. Z. II, 128; alternans Macq. D. E. II, 2, 89; hetero- 

 gaster Thorns, and pleuralis Thoms. Eug. Resa 497—498; triligatus 

 Walk. J. Pr, Lin. Soc. I, 19, The true S. balteatus occurs in Su- 

 matra (v. d. Wulp, Sumatra Exp. 33). I cannot identify my species 

 with any of the above quoted descriptions; at the same time, the bad 

 state of preservation of my specimens prevents me from describing them. 



Prof. Rondani (Ann. Mus. Civ. Geneva, VII, 423) identified a spe- 

 cies from Borneo with S. neglectus Wied. A. Z, II, 134 (patria ignota). 

 I compared his type in Genoa with Wiedemann's description and found 

 that the identification cannot be sustained, being merely based on 



8* 



