Dicraeus, Loew, 1873

Liu, Xiaoyan, Yang, Ding & Nartshuk, Emilia P., 2019, New species and records of Dicraeus Loew, 1873 from China (Diptera: Chloropidae), Zootaxa 4554 (2), pp. 351-370 : 352-353

Key to species of Dicraeus from China (modified from Kanmiya 1971)

1. Scutum background yellow or brown; thoracic pleuron yellow, partly reddish yellow or brown........................ 2

-. Scutum entirely black; thoracic pleuron entirely or largely black................................................ 5

2. Scutellum entirely yellow............................................................................... 3

-. Scutellum entirely blackish brown (figs. 1, 12–15)......................................... D. crassispinus sp. nov.

3. Frons yellow; ocellar triangle reaching anterior 2/3 of frons.................................................... 4

-. Frons brown with anterior 1/2 yellow; ocellar triangle reaching anterior margin of frons (figs. 4, 24–27)................................................................................................. D. liupanshanensis sp. nov.

4. Scutum yellow with 5 longitudinal stripes; surstylus broad basally, with 3 spinous setae, suddenly narrowed at middle and curved; mesolobus long, 2 times as long as surstylus, bent toward venter of epandrium (figs. 2, 16–19)......................................................................................................... D. curvus sp. nov.

-. Scutum yellow with 3 longitudinal stripes; surstylus broad distally, with some thickened setae on inner side of lateral and distal portions; cercus broad basally, distal 2/3 narrow, finger-like, directed medioventrally (figs. 5, 28–31).................................................................................................... D. minutidentatus sp. nov.

5. Thoracic pleuron entirely black or blackish brown with anepisternum and propleuron partly yellow..................... 6

-. Thoracic pleuron black with a longitudinal yellow stripe running from posterior angle or lower half of postpronotal lobe to wing base............................................................................................ 8

6. Palpus yellow; wing entirely hyaline...................................................................... 7

-. Palpus brown; wing infuscated with pale brown (figs. 6, 32, 38)............................... D. fuscipennis Kanmiya

-. Ocellar triangle reaching anterior 9/10 of frons; surstylus nearly parallel-sided, narrowed distally in lateral view; cercus with a dentation distally (figs. 3, 20–23).......................................................... D. dentatus sp. nov.

8. Antenna entirely black; thoracic pleuron with a longitudinal yellow stripe running from lower half of postpronotal lobe to wing base; femora brown with yellow distally (figs. 9, 35 41)........................................ D. orientalis Becker

-. Antenna yellow with dorsal portion of first flagellomere brown; thoracic pleuron with a longitudinal yellow stripe running from posterior angle of postpronotal lobe to wing base; femora entirely yellow..................................... 9

9. Scutum subshining, entirely and sparsely covered with brown pruinescence; epandrium blackish brown; surstylus broadened basally, narrowed at middle and curved in a S-shaped form in lateral view (figs. 10, 36, 42)...... D. phyllostachyus Kanmiya

-. Scutum almost entirely shining, without prominent pruinescence; epandrium yellow to brownish yellow; surstylus nearly parallel-sided in lateral view.............................................................................. 10

10. Surstylus 2 times as height as epanderium, curved at middle in lateral view (figs. 7, 33, 39)........... D. malaisei Nartshuk

-. Surstylus shorter than height of epanderium, straight in lateral view............................................. 11

11. Gena 0.25 times as deep as eye; palpus partly or distal 1/2 brown; all tarsomeres 2–5 brown; surstylus clavate in lateral view........................................................................................ D. flavipes Duda

-. Gena 0.3–0.4 times as deep as eye; palpus entirely yellow; tarsi entirely yellow or only tarsomere 5 brown; surstylus parallelsided in lateral view (figs. 8, 34, 40)..................................................... D. nartshukae Kanmiya