Morphostenophanes

Zhou, De-Yao, 2020, A revision of the genus Morphostenophanes Pic, 1925 (Coleoptera, Tenebrionidae, Stenochiinae, Cnodalonini), Zootaxa 4769 (1), pp. 1-81 : 74-76

Key to species of the genus Morphostenophanes

1 Elytra with continuous and straight striae, intervals evenly convex; or elytral intervals intermittently expanded and convex, with distorted or sometimes interrupted striae................................................................... 2

- Elytra with interrupted striae, adjacent segments of striae usually oppositely curved, connected and forming encircled areas with convex central portions; or with irregularly scattered short rows of punctures; or with densely scattered irregularly distributed tubercles........................................................................................ 3

2 Large species, body length> 19 mm; apical lobes of male sternite VIII weakly curved in dorsal view, without tick-shaped notches in lateral view; ovipositor elongate, gradually narrowing posteriorly ( atavus -group).......................... 6

- Medium sized or small species, body length <19 mm; apical lobes of male sternite VIII strongly curved in dorsal view, each with tick-shaped notch in lateral view; ovipositor shortened, abruptly narrowed in apical third ( metallicus -group)........ 11

3 Small species, body length <18 mm; legs short; apex of parameres flabellate, apical margin evenly and abruptly thickened, forming carina ( jendeki -group)......................................................................... 12

- Medium sized or large species, body length> 19 mm; legs elongate; apex of parameres variable in shapes, apical margin not thickened or weakly thickended, never forming a carina................................ ....................... 4

4 Frons never depressed along midline, rarely depressed near eyes; elytra widest in, or slightly before middle; male sternites V and VI rarely depressed in middle of apical half; ovipositor elongate, gradually narrowing posteriorly ( elegantulus -group)... ................................................... ............................................... 18

- Frons usually depressed along the midline, vaguely or markedly depressed near eyes; elytra widest in, or behind middle; male sternites V and VI usually depressed in middle of apical half, with central portions of these impressions convex; ovipositor usually short, abruptly narrowing in apical third............................................................. 5

5 Elytra with short strial punctures irregularly scattered and interconnected, forming network, gridding intervals uneven in size and shape, some strongly swelled, forming tubercles ( chongli -group)........................................... 22

- Elytra with rows of encircled segments of striae, forming rounded or ovate impressions, with central portions convex, distribution of encircled segments of striae becoming irregular towards either side ( aenescens -group)...................... .. 23

6 Elytra with twisted striae, intervals intermittently expanded and convex............................... M. bannaensis

- Elytra with straight striae, intervals evenly convex........................................................... 7

7 Elytra aeneous, with strong metallic luster................................................................. 8

- Elytra black, without metallic luster...................................................................... 9

8 Male pro- and mesotibiae bulged in apical 2/5................................................... M. vietnamicus

- Male pro- and mesotibiae not bulged in apical 2/5................................................ M. birmanicus

9 Pronotal disc moderately convex, elytra aspect ratio> 1.9 in male; male metatibiae strongly curved in apical 3/5; apical lobes of male sternite VIII straightly produced posteriorly, not hooked in lateral view.......................... M. lincangensis

- Pronotal disc strongly convex, elytra aspect ratio <1.9 in male; male metatibiae straight or weakly sinuous; apical lobes of male sternite VIII bent ventrally, hooked...................................................................... 10

10 Antennae reaching basal 2/7 of elytra; mesotibiae with apical spurs exposed and visible in ventral view; metafemora reaching basal half of sternite VII........................................................................ M. atavus

- Antennae reaching basal 1/3 of elytra; mesotibiae with apical spurs covered and invisible in ventral view; metafemora reaching posterior margin of sternite VII............................................................... M. brevigaster

11 Elytra with twisted striae, intervals intermittently expanded and convex................................. M. linglong

- Elytra with straight striae, intervals evenly convex................................................. M. metallicus

12 Elytra with interrupted striae of punctures, some adjacent segments of striae oppositely curved and encircled, forming round or ovate depressed areas, whose central portions weakly convex........................................... M. minor

- Elytra with irregularly scattered short striae of punctures..................................................... 13

13 Elytral strial punctures densely scattered and connected with each other, forming meshy striae, intervals strongly convex, forming densely scattered tubercles........................................... .................... M. tuberculatus

- Elytral strial punctures sparsely scattered, never connected with each other, intervals weakly or moderately convex....... 14

14 Pronotum wide, PW/PL = 1.3, posterior angles vertical, slightly projecting laterad; inner margins of male protibiae bulged in apical half................................................................................... M. crassus

- Pronotum moderately wide, PW/PL <1.2, posterior angles obtuse, not projecting laterad; inner margins of male protibiae smooth............................................................................................ 15

15 Body with bronze metallic luster.................................................................. M. planus

- Body with greenish metallic luster...................................................................... 16

16 Elytral strial punctures short, usually forming large pits, sparsely scattered............................... M. tanikadoi

- Elytral strial punctures elongate, rarely forming lagre pits, densely scattered...................................... 17

17 Genae and tempora strongly produced; paired impressions on pronotal disc indistinct or absent; elytra only feebly wrinkled....................................................................................... M. jendeki jendeki

- Genae and tempora not or slightly produced; paired impressions on pronotal disc deep and sharply marked; elytra distinctly wrinkled.............................................................................. M. jendeki similis

18 Body dark colored, black or brownish black, only feebly shiny................................................ 19

- Body light colored, bronze, greenish, or dark green, considerably shiny......................................... 21

19 Body brownish black, pronotum, major parts of elytra, major parts of legs reddish....................... M. elegantulus

- Body uniformly black, pronotum, major parts of elytra, major parts of all legs black............................... 20

20 Width-length ratio of clypeus about 1.75; male pronotum narrower, PW/PL = 1.12–1.21; female elytra narrower, EL/EW = 1.73–1.84.................................................................................... M. furvus

- Width-length ratio of clypeus about 2.00; male pronotum wider, PW/PL = 1.21–1.23; female elytra wider, EL/EW = 1.60–1.64...................... .............................................................. M. furvus weishanus

21 Body bronze colored, light greenish, with weaker metallic luster; with more elongate habitus, antennomere XI more than 3x as long as wide, apex of parameres slightly bent ventrally in lateral view................................... M. sinicus

- Body colored bronze or dark green, with stronger metallic luster; with less elongate habitus, antennomere XI less than 3x as long as wide, parameres straightly produced in lateral view...................................... M. gaoligongensis

22 Cephalic and pronotal punctation consisting of large and deep punctures; male pronotum barrel-shaped, disc with pair of deep impressions in middle, without additional impressions on anterior portion................................ M. chongli

- Cephalic and pronotal punctation consisting of large and shallow punctures; male pronotum quadrate, disc with pair of deep impressions before middle, without pair of shallow additional impressions on anterior portion.......... M. chongli glaber

23 Body dark colored, black, pitch-black, or somewhat grey, not or only weakly shiny................................ 24

- Body bronze or unevenly bright-colored, strongly shiny........... ........................................... 26

24 Body uniformly greyish black or pitch black, moderately convex; encircled areas of elytra in most cases without pinkish luster, if not, than pinkish luster only faintly presented................................................... M. yunnanus

- Body greyish, weakly or moderately convex; encircled areas of elytra with conspicuous pinkish luster................. 25

25 Body dark greyish blue, without coppery luster; male pronotum and elytra convex....................... M. aenescens

- Body greyish green, with coppery luster; male pronotum and elytra convex...................... .. M. aenescens yelang

26 Body uniformly colored, pronotal disc without annular band.................................................. 27

- Body unevenly colored, pronotal disc with annular band..................................................... 30

27 Elytral with large encircled areas, shallowly depressed, central portion strongly swelled, sharply protruding from elytral surface.......................................................................................... M. papillatus

- Elytra with small encircled areas, deeply depressed, central portion weakly swelled, feebly protruding from elytral surface.. .................................................................................................. 28

28 Tempora strongly convex, separated from head by sulci; male protibiae straight, not curved on apical portions.................................................................................................... M. purpurascens

- Tempora weakly convex, not separated from head by sulci; male protibiae curved on apical portions.................. 29

29 Pronotum quadrate; male pro- and mesotibiae evenly curved, protibia with inner margin pubescent along apical 2/3................................................................................................. M. curvitibialis

- Pronotum barrel-shaped; male pro- and mesotibiae only curved in apical fourth, protibial with inner margin pubescent along apical 3/5.............................................................................. M. luoxiaoshanus

30 Pronotum pinkish, with green annular band; male with moderately convex pronotum and elytra, pronotum quadrate, constricted before the base; female with shortened elytra, EL/EW <1.7........................................ M. cuproviridis

- Pronotum greenish, with pink annular band; male with strongly convex pronotum and flattened elytra, pronotum barrel-shaped, never constricted before the base; female with elongate elytra, EL/EW> 1.7............................ M. iridescens