﻿THE ENTOMOLOÜlCAL MAGAZINE, Vol. III. Pt. Ill & VI. 131 



surpassing the tip of the abdomen, at rest placing parallel with the 

 body ； the 3rd longitudinal vein straight, first posterior cell with an 

 anterior acute angle. Calyptres small, but distinct. Metamorphosis 

 of these insects are not yet well known, but they are most probably 

 aphidivorous as SyrphuS- They are common on some flowers of 

 umbelliferous plants, especially in the swampy meadow, and their 

 behaviors being nearly the same as Syrphus. 

 Genotype— Melauostoma hyalinata Fall. 



inornatum n. sp. 

 urakawense n. sp. 



Table of species 



1. Abdomen with spots 



― Abdomen without spots 



2. Abdomen with bluish spots 



― Abdomen with yellowish spots 3 



3. Antennae black or brown 4 



一 Antennae yellowish, atmost the 3rd joint on its apex fuscous. 7 



4. Abdomen with 3 pairs of spots ., 5 



一 Abdomen with 4 pairs of spots ... 6 



5. The 2nd, and 4th abdominal segments with spots 



• … elongatum n. sp. 



一 The 3rd, 4th and 5th abdominal segments with spots ... 

 motodomariense n. sp. 



6. Abdominal spots nearly of equal size, all touching the 

 lateral sides mellinum L. 



一 The first pair of the abdominal spots very small, only the 



tenuis n. sp. 



teizonis n, sp. 



last 2 pairs touching the lateral sides 



7. Abdominal spots longer than wide .. 

 ― Abdominal spots wider than long 



8. Abdomen with 3 pairs of spots ... 

 ― Abdomen with 4 pairs of spots 



9. Abdomen as broad as the thorax ... ochiaianum n. sp. 

 一 Abdomen distinctly broader than the thorax 



10. The 2nd and 3rci spots trianjjular Orientale Wied- 



一 The 2nd and 3rd spots oblong, at the base bein<7 truncated 



ogasawaxae n. sp. 



8 

 II 



10 



