Melanagromyza

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528 : 504-505

Key to Thailand species of Melanagromyza

1. Calypter with fringe white or yellowish.................................................................... 2

- Calypter with fringe brown to black...................................................................... 19

2. Mesoscutum and abdomen shining coppery-greenish or -bluish; surstylus not as follows............................. 3

- Mesoscutum without or with slightly metallic sheen, abdomen sometimes with detectable greenish tinge; surstylus projected narrowly, bearing about 25 spines........................................................................ 18

3. Ocellar triangle large, extending ventrally.................................................................. 4

- Ocellar triangle small, of normal size...................................................................... 7

4. Ocellar triangle with ventral tip extending to level of first ori; surstylus, phallapodeme and phallus not as follows........ 5

- Ocellar triangle with ventral tip extending obtusely to dorsal margin of lunule; surstylus with 15–17 spines; phallapodeme and phallus very long (widespread in Oriental region; host plants: Cajanus , Phaseolus spp. etc.)..... M. obtusa (Malloch, 1914)

5. Gena gradually inclined to postgena, broadened posteriorly; r-m almost at midpoint of discal cell; basiphallus with sclerites laterally............................................................................................ 6

- Gena rounded, forming ring below eye, deepest at middle (1/7 as high as eye); r-m slightly before midpoint of discal cell;

basiphallus subtriangular (widespread throughout Old World tropics; Japan; host plants: Cajanus , Glycine , Phaseolus , etc.)................................................................................. M. sojae (Zehntner, 1900) 6. Large species, wing length 2.5 mm; surstylus with about 20 spines on distal projection; basiphallus consists of quadrate sclerites, distiphallus with distal tube short and smooth...................................... M. cirrappendicula sp. nov.

- Smaller, wing length 1.9–2.2 mm; surstylus with 26 spines; basiphallus with lateral sclerites isolated and slightly joined at middle, distiphallus with distal tube densely striated........................................ M. multistriata sp. nov.

7. Mesoscutum bluish-black; gena narrow (1/13–1/16 as high as eye); arista distinctly pubescent; phallus with conical, membranous process between basiphallus and mesophallus (New Britain, Thailand)................ M. lividula Sasakawa (1963d)

- Mesoscutum predominantly greenish-black; arista microscopically pubescent; phallus not as above.....................8

8. Eye bare............................................................................................. 9

- Eye in male with a patch of hairs anterodorsally............................................................ 15

9. Large species, wing length 2.6 mm; body strongly shining reddish-coppery; frons 1.5 times as wide as eye; surstylus with many spines in arrangement of two groups................................................. M. sexseriata sp. nov.

- Smaller species, wing length less than 2.3 mm; frons almost as wide as eye; surstylus not as above.................... 10

10. Mesoscutum and abdomen multi-colored, greenish, bluish or purplish; surstylus with about 15 spines ( Indonesia, Taiwan; Japan; host plants: Glycine , Phaseolus , Pueraria spp. etc.)........................... M. dolichostigma Meijere (1922)

- Mesoscutum and abdomen shining coppery or greenish; surstylus not as above................................... 11

11. Distiphallus with spinulose patches at middle of dorsolateral sides.............................................. 12

- Ditiphallus without spinulose patch...................................................................... 13

12. Surstylus with 11–14 spines dorsad of ventral setal cluster; basiphallus distinctly shorter than distiphallus................................................................................................... M. spinuliloba sp. nov.

- Surstylus with 26–30 spines along ventral margin; basiphallus with sclerites diverging distally, subequal to distiphallus in length................................................................................ M. turgida sp. nov.

13. Basiphallus subequal to distiphallus in length, distiphallus with short process near dorsal base (Spencer 1986, figs 3, 4); surstylus with 12 spines (widespread from Fiji to India, Africa)............................. M. albisquama (Malloch, 1927)

- Basiphallus distinctly shorter than distiphallus.............................................................. 14

14. Phallus: see Spencer 1986, figs 5, 6.............................................. M. erawanensis Spencer (1986)

- Phallus: see Spencer 1986: figs 13, 14............................................... M. pasiensis Spencer (1986)

15. Frons 1.5 times as wide as eye; gena 1/8 as high as eye; basiphallus with sclerites extending laterally and connecting at both ends; distiphallus: see Spencer 1986, figs 11, 12 ( Thailand)................................ M. pasiae Spencer (1986)

- Frons almost as wide as eye; basiphallus and distiphallus not as above........................................... 16

16. Gena 1/5 as high as eye; surstylus with a row of several spines dorsad of two ventromarginal rows of about 20 spines; basiphallus with lateral sclerites connecting at end (see Sasakawa 1981, figs 1A–C) ( Sri Lanka, Thailand)...................................................................................................... M. cleomae Spencer (1961)

- Gena 1/10–1/12 as high as eye; surstylus not as above........................................................ 17

17. Basiphallus with sclerites distally diverging ventroapically (distiphallus: see Spencer 1986, figs 9, 10)............................................................................................... M. metallica (Thomson, 1869)

- Basiphallus with sclerites connecting at ends (distiphallus: see Spencer 1986: figs 7, 8; Thailand).................................................................................................. M. inthanonensis Spencer (1986)

18. Mesoscutum weakly shining coppery when viewed from rear; hypandrium with basal apodeme long (1/2 as long as whole length); basiphallus U-shaped in ventral view; distiphallus simple, smooth on surface............... M. macilenta sp. nov.

- Mesoscutum shining, with (♂) or without (♀) trace of coppery coloration; hypandrium with apodeme short (less than 1/3 of whole length); basiphallus tubular, distiphallus spinulose on dorsolateral lobes ( Thailand)........ M. yodai Sasakawa (1962)

19. Parafrontalia not projecting above eye margin in profile...................................................... 20

- Parafrontalia distinctly projecting above eye in profile....................................................... 23

20. Mesoscutum without metallic luster, abdomen shining metallic-coppery; frons almost as wide as eye; gena narrow (1/10 as high as eye); surstylus with 16 long spines; phallus with ventral membranous part extremely swollen.. .. M. catalexis sp. nov.

- Mesoscutum and abdomen without metallic luster; frons wider than eye; gena and surstylus not as above............... 21

21. Mid tibia with one or two pd; frons 1.3–1.4 times as wide as eye; gena 1/4–1/6 as high as eye........................ 22

- Mid tibia with one pd; frons as wide as eye; gena narrow, 1/14 as high as eye (male unknown) ( Thailand)............................................................................................ .. M. gressitti Sasakawa (1963a)

22. Ultimate section of CuA1 1/2–3/4 as long as penultimate; surstylus with about 30 spines along ventral margin; distiphallus bifurcate distally, bearing numerous spinules and granules................................... M. pandiculata sp. nov.

- Ultimate section of CuA1 4/5 as long as penultimate; surstylus with 40 spines at anterior corner; distiphallus simple, U-shaped in dorsal view.......................................................................... M. ancyla sp. nov.

23. Mesoscutum faintly and abdomen distinctly coppery-shining; frons 1.3 times as wide as eye; gena 1/11 as high as eye; mid tibia without pd; surstylus with small anteroventral projection, bearing 7–9 spines basally; distiphallus folded twice at base ( Malaysia, Thailand)........................................................ .. M. malayensis Sasakawa (1963a)

- Mesoscutum and abdomen greenish-lusterless; frons almost as wide as eye; gena 1/4–1/7 as high as eye; mid tibia with one to three short pd; phallus with membranous swelling ventrally................................................... 24

24. Wing length 2.3–2.6 mm; first antennal flagellomere with long pile; epiphallus and basiphallus very short ( Indonesia, Taiwan, Thailand)..................................................................... .. M. provecta (Meijere, 1910)

- Wing length 1.7 mm; first antennal flagellomere minutely pilose; epiphallus long, basiphallus U-shaped in ventral view........................................................................................... M. lunulata sp. nov.