Scathophagidae

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 : 551

Key to the genera of Japanese Scathophagidae (males and females)

1. Fore femur and tibia ventrally with remarkable rows of spine-like setae, longer than diameter of femur and tibia ( Hironaga & Suwa 2005)........................................................................ Norellisoma Wahlgren

- Fore femur and tibia without ventral rows of long spine-like setae............................................... 2

2. Palpus short and small, less than length of proboscis ( Hering 1955)............................. Parallelomma Becker

- Palpus long and large, longer than length of proboscis........................................................ 3

3. Palpus with strong subapical setae about as long as or longer than palpus (see Iwasa (2020, fig. 7))....... Cordilura Fallén

- Palpus without very strong subapical setae ( Fig. 2 )........................................................... 4

4. Katepisternum with two or three setae..................................................................... 5

- Katepisternum with one seta ( Fig. 44 )..................................................................... 6

5. Katepisternum with two setae........................................................... Chaetosa Coquillett

- Katepisternum with three setae ( Fig. 16 )................................................... Cleigastra Macquart

6. Fore tibia ventrally without rows of long spine-like setae but with 1 or more rows of short black spines ( Fig. 45 ).......... 7

- Fore tibia ventrally without rows of both long spine-like setae and short black spines................................ 8

7. Apex of fore tibia with a stout ventral seta ( Suwa 1986)..................................... Acanthocnema Becker

- Apex of fore tibia without stout ventral seta............................................... Microprosopa Becker

8. Anepisternum, katepisternum, and anepimeron wholly covered with dense, long erect fine hairs....................... 9

- Anepisternum, katepisternum, and anepimeron covered with sparse fine hairs or bare.............................. 10

9. Palpus distinctly spatulate ( Fig. 54 )....................................................... Spaziphora Rondani

- Palpus filiform or clavate.............................................................. Scathophaga Meigen

10. Arista plumose ( Fig. 30 ) or short-haired ( Figs 34 , 40 ); body shiny yellow........................................ 11

- Arista bare ( Fig. 53 ) or pubescent ( Fig. 7 ); body shiny black, grey microtrichose or dusted.......................... 12

11. Scutellum with pair of strong setae ( Fig. 28 ).............................................. Megaphthalma Becker

- Scutellum with two pairs of strong setae............................................ Megaphthalmoides Ringdahl

12. Arista relatively short, thick and slightly longer than postpedicel; postpedicel enlarged in males ( Fig. 2 )..................................................................................................... Acerocnema Becker

- Arista rather thin, and distinctly longer than postpedicel; postpedicel not more enlarged in both sex ( Fig. 22 )................................................................................................ Gimnomera Rondani

Figures

FIGURES 1–6. Acerocnema incisa sp. nov. 1, Male head and thorax, dorsal view (holotype); 2, Male head, left lateral view; 3, Male sternite V, ventral view; 4, Male terminalia, left lateral view; 5, Male terminalia, posterior view; 6, Female terminalia, left lateral view. Abbreviations: Head—ar, arista; fr, frontal setae; oc, ocellar setae; or, orbital setae; pal, palpus; ppd, postpedicel; prb, proboscis; vte, outer vertical setae; vti, inner vertical setae; vib, vibrissa. Abdomen - aed, aedeagus; cer, cercus; ep, epandrium; epiph, epiphallus; epipr, epiproct; hypr, hypoproct; pm, paramere; st, sternite; sur, surstylus; tg, tergite.

FIGURES 44–48. Microprosopa haemorrhoidalis (Meigen). 44, Katepisternum, left lateral view; 45, Male tibia, left anterior view; 46, Male sternite V, ventral view; 47, Male terminalia, left lateral view; 48, Male terminalia, posterior view.

FIGURES 15–20. Cleigastra tibiella (Zetterstedt). 15, Male, lateral view; 16, Katepisternum; 17, Male fore femur, anterior view (left); 18, Male sternites IV and V; 19, Male terminalia, left lateral view; 20, Male terminalia, posterior view.

FIGURES 52–56. Spaziphora tomkovichi (Ozerov). 52, Male, lateral view; 53, Male postpedicel and pedicel, left lateral view; 54, Male palpus, left lateral view; 55, Male sternite V and terminalia, left lateral view; 56, Male sternite V and terminalia, posterior view.

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 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.

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 7–10. Chaetosa punctipes (Meigen). 7, Male postpedicel and pedicel, left lateral view; 8, Male sternite V, ventral view; 9, Male terminalia, left lateral view; 10, Male terminalia, posterior view.

FIGURES 28–29. Megaphthalma pallida (Fallén). 28, Scutellum, dorsal view view; 29, Female abdomen, dorsal view.

FIGURES 21–27. Gimnomera torikurai sp. nov. 21, Male, lateral view; 22, Male head, left lateral view; 23, Male sternite V, ventral view; 24, Male terminalia, left lateral view; 25, Male terminalia, posterior view; 26, Aedeagus and associated parts; 27, Female terminalia, left lateral view. Abbreviations—Head: subvib, subvibrissa; vib, vibrissa. Abdomen: aed, aedeagus; epiph, epiphallus; pmlb, posterior median lobe; pm, paramere.