SYRPHIDAE. 



193 



the third and fourth segments are quite narrow, either interrupted or nearly so, 

 and do not approach the anterior margin. In one specimen, however, the 

 yellow bands on the third and fourth segments are contiguous as described for 

 typical examples, but the fifth segment has, instead of a black transverse band, 

 an obscure brownish spot on either side. Most of the females have the fifth 



Text-fig. 1. — I sehiodon scutellar is Fahi. ^. 



segment wholly shining black, with narrow posterior margins and small anterior 

 corners obscurely shining brownish. 



Upolu: Malololelei, 3 19.iv, 21-25.vi.l924 (Armstrong). Tutuila, 



2 <$<^, 25-30.ix.l923 (Swezey and Wilder). There are also 1 c^, 2 from 

 Tonga (Vavau, Haloga), 9.iii.l925 (Hopkins). 



5. Xanthogramma javanum Wied. 



Three from Tutuila, Savaii, and Upolu. Owing to the black-haired 

 scutellum and the reversed coloration of the hind tibiae, this species is readily 

 distinguishable from Ischiodon scutellaris Fabr. The third joint of the antennae 

 is about as broad as long, rounded at the tip, and brownish-orange in colour, 

 VI. 4 2 



