Ptecticus

Zai-Hua, Yang, Xiao-Ming, Chen & Mao-Fa, Yang, 2015, Two new species and two new records of Ptecticus Loew (Diptera: Stratiomyidae: Sargiinae) from China, Zootaxa 3964 (4), pp. 433-444 : 434

Key to species of Chinese Ptecticus (partly based on Rozkošný & Hauser, 2009)

1 Median occipital (post vertical) sclerite yellow............................................................... 2

- Median occipital sclerite black........................................................................... 7

2 Wing bicoloured or more or less darkened.................................................................. 3

- Wing hyaline......................................................................................... 5

3 Male cerci slender, gonostyli shifted to middle, slender and narrow............................... P. kerteszi de Meijere

- Male cerci broad, nearly triangular, gonostyli broader and in normal position...................................... 4

4 Darkening of wing apex reaching discal cell or nearly so; basal 1–4 abdominal segments usually ochre yellow, rest of abdomen wholly black........................................................................ P. melanurus (Walker)

- Darkening of wing apex reaching usually only middle or slightly more of distance between discal cell and wing margin; abdominal segments 3–5 usually with extensive dark spots...................................... P. aurifer (Walker)

5 Legs mostly black, tarsi yellowish brown, but basitarsus of hind tarsus black with yellowish brown apex...................................................................................................... P. brunescens Ôuchi

- Legs predominantly yellow.............................................................................. 6

6 Legs mostly yellow, but hind tibia black, hind tarsus white but basitarsus with black base; aedeagal complex thick............................................................................................ P. sinchangensis Ôuchi

- Legs mostly yellow, but tarsomeres 4 and 5th tarsomeres of fore and mid legs black; aedeagal complex slender with pointed apex............................................................................. .. P. elongates Yang et al.

7 R2+3 very short, mostly indistinct.......................................................... P. shirakii Nagatomi

- R2+3 long, distinctly visible............................................................................... 8

8 Hind legs completely black; male cerci unusually long...................................... P. japonicus (Thunberg)

- Hind legs at least partly yellow; male cerci not unusually long.................................................. 9

9 Postcubitus vein distinct............................................................................... 10

- Postcubitus vein not pigmented......................................................................... 12

10 Scutum mostly black or at least partly black................................................................ 11

- Scutum wholly brownish yellow; abdomen brownish yellow with black transverse spots.............. P. cingulatus Loew

11 Scutum with 3 broad black strips............................................................. P. tricolor Wulp

- Scutum wholly black................................................................... P. bicolor Yang et al.

12 Scutellum dark to black with yellow to brown margin........................................................ 13

- Scutellum yellow to brownish yellow.....................................................................15

13 Pleura wholly pale yellow, without any spots; hind basitarsus snow white but its outer side with black basal part.............................................................................................. P. brevispinus sp. nov.

- Pleura yellow, with large brownish to bluish-black spots; hind basitarsus snow white, darkened at most basally.......... 14

14 Genital capsule without posterolateral proceses................................... P. longispinus Rozkošný & Kovac

- Genital capsule with long posterolateral process on each side............................. P. longipennis (Wiedemann)

15 Lower half of frontal callus markedly darkened............................................ P. vulpianus (Enderlein)

- Frontal callus wholly yellow............................................................................ 16

16 Aedeagal complex reduced, ring-shaped proximally.......................................... .. P. australis Schiner

- Aedeagal complex of another shape...................................................................... 17

17 Genital capsule with broad bipartite medial process distally, gonostylus slender ( Rozkošný & Hauser, 2001: Figs 6–7 )................................................................................ .. P. srilankai Rozkošný & Hauser

- Medial process of genital capsule consisting of two slender structures, gonostylus stout, abruptly tapered before apical tip....................................................................................................... 18

18 Genital capsule transverse, broader than long, aedeagal complex only little sclerotised, flat, short and bifid apically, not swol- len proximally ( Rozkošný & Hauser, 2009: Figs 9, 10 )............................. P. fukienensis Rozkošný & Hauser

- Genital capsule longer than wide, aedeagal complex well sclerotised, bipartite and both parts gradually tapered and pointed apically, base of aedeagal complex swollen, almost round ( Figs 10–12 )......................... P. guangxiensis sp.nov.

Figures

FIGURES 6 – 12. Ptecticus guangxiensis sp. nov., male: 6, wing; 7, abdomen in dorsal view; 8, epandrium, proctiger and cerci in dorsal view; 9, epandrium, proctiger and cerci in lateral view; 10, aedeagal complex in lateral view; 11, genital capsule and aedeagal complex in dorsal view; 12, genital capsule in ventral view.