Sepsidae

Li, Xuankun & Yang, Ding, 2014, Mucha Ozerov and Ortalischema Frey newly recorded from China with descriptions of two new species (Diptera, Sepsidae), Zootaxa 3815 (2), pp. 249-262 : 250

Key to the Chinese genera of Sepsidae

1 Thorax and abdomen dully shining; mid femur dorsally concaved at middle....................... Toxopoda Macquart

- Thorax and abdomen shining; mid femur not concaved at middle............................................... 2

2 Abdomen not constricted between tergites 2 and 3............................................................ 3

- Abdomen constricted between tergites 2 and 3............................................................... 5

3 Br and bm cell united........................................................... Saltella Robineau –Desvoidy

- Br and bm cell separated............................................................................... 4

4 Setae on head reduced, with only 1 vti; fore tarsus flattened and banded black and white............... Ortalishema Fery

- Setae on head developed, with 1 oc, 1 pvt, 1vti, 1 vte, and 1 or; fore tarsus without above structure and colour.............................................................................................. Decachaetophora Duda

5 Supra–alar seta absent; anepisternal seta vestigial or absent............................. Themira Robineau –Desvoidy

- Supra–alar seta present; anepisternal seta present............................................................ 6

6 Arista with plumose or with short rays.................................................................... 7

- Arista bare.......................................................................................... 8

7 Face with well-developed facial carina; flagellomere I strongly lengthened, length nearly 2.5 times longer than width; arista plumose, rays distinctively longer than greatest diameter of arista ( Fig. 5 E)............................ Mucha Ozerov

- Face without well-developed facial carina; flagellomere I not lengthened, length less than 2 times longer than width; arista with very short rays, longest rays not longer than greatest diameter of arista........................... Aristina Ozerov

8 Fronto–orbital setae developed............................................................ Meroplius Rondani

- Front–orbital setae vestigial or absent..................................................................... 9

9 Male fore femur without any spines, setae, and tubercles........................................ Perochaeta Duda

- Male fore femur with complex arrangement of spines, setae or tubercles........................................ 10

10 Male fore femur without spines or tubercles, only with a series of very short anteroventral spinules on apical half and a row of well–spaced posteroventral setae; sternite 4 heavily modified, with two pairs of moveable brushy appendages........................................................................................ Nemopoda Robineau –Desvoidy

- Male fore femur not as above; sternite 4 normal, not modified................................................ 11

11 Abdomen in both sexes without distinct striking setae; male surstylus bifurcate at tip................ Dicranosepsis Duda

- Abdomen in male and often in female also with distinct striking setae; male surstylus not bifurcate................... 12

12 Middle part of fore femur ventrally with 3–4 strong spines on a strong tubercle, followed by small tubercle frontward bearing 2 pv setae; wing hyaline, without dark spot near apex; epandrium weakly sclerotized.................. Allosepsis Ozerov

- Fore femur not as above; wing sometimes with dark spot near apex; epandrium often strongly sclerotized...... Sepsis Fallén

Figures

FIGURE 5. Mucha liangi sp. nov., male. A, left fore femur and tibia, anterior view; B, left fore femur, posterior view; C, genitalia, left lateral view; D, genitalia, posterior view; E, head, left lateral view. Scale bars = 0.1 mm.