Megaphthalmoides, Ringdahl, 1936

Iwasa, Mitsuhiro, 2021, Three new species and six new records of Scathophagidae (Diptera) from Japan with a key to the Japanese genera, Zootaxa 4981 (3), pp. 531-553 : 545

Key to the species of Japanese Megaphthalmoides (male and females)

1. Large-sized, 7.8–10.0 mm in body length; postpedicel wholly yellow; arista plumose ( Fig. 30 )........ M. japonicus Ozerov

- Medium-sized, 5.0–6.0 mm in body length; postpedicel wholly or partly black; arista short-haired..................... 2

2. Frontal vitta with a distinct black pattern ( Fig. 39 ); postpedicel wholly black ( Fig. 40 )................ M. vittatus sp. nov.

- Frontal vitta wholly yellow without a black pattern; postpedicel black in distal two-thirds and yellow in basal one-third ( Fig. 34 )............................................................................ M. unilineatus Zetterstedt

Figures

FIGURES 30–33. Megaphthalmoides japonicus Ozerov. 30, Male postpedicel and pedicel, left lateral view; 31, Male sternite V, ventral view; 32, Male terminalia, left lateral view; 33, Male terminalia, posterior view.

FIGURES 38–43. Megaphthalmoides vittatus sp. nov. 38, Male adult, left lateral view; 39, Head, dorsal view; 40, postpedicel and pedicel, left lateral view; 41, Male sternite V, ventral view; 42, Male terminalia, left lateral view; 43, Male terminalia, posterior view.

FIGURES 34–37. Megaphthalmoides unilineatus (Zetterstedt). 34, Male postpedicel and pedicel, left lateral view; 35, Male sternite V, ventral view; 36, Male terminalia, left lateral view; 37, Male terminalia, posterior view.