Macrophya nigrotrochanterata, Liu & Li & Wei, 2020

Liu, Mengmeng, Li, Zejian & Wei, Meicai, 2020, Key to the Macrophya sibirica group (Hymenoptera: Tenthredinidae) with description of a new species from China, Zoologia (e 51168) 37, pp. 1-8 : 2-4

Key to adults of the Macrophya sibirica group from China

1. Forewing with distinct smoky maculae ( Figs 2, 3) ............... 2

1’. Forewing hyaline, clearly without any smoky maculae ( Figs 4, 5)................................................................................... 3

2. Smoky macula in forewing extending from stigma to vein M and apically to wing tip ( Fig. 2); hind trochanter entirely white; hind tibia with distinct white ring at midlength, 0.5× length of hind tibia; posterior 3/5 of abdominal tergum 1 white, basal 2/5 of abdominal tergum 1 black; anterior margin of clypeus shallowly emarginate, lateral lobes short and broad; middle serrulae of lancet with 9 to 11 denticles, subbasal tooth small, setae on annuli long and dense. China (Henan) ..... M. typhanoptera Wei & Nie, 1999

2’. Smoky macula in forewing approximately round, extending from stigma to distal margin of wing but not reaching wing tip ( Fig. 3); hind trochanter and tibia entirely black; abdominal tergum 1 with narrow white band posteriorly; anterior margin of clypeus deeply circularly incised, lateral lobes narrow and long; middle serrulae of lancet with 5 to 6 denticles, subbasal tooth large, setae on annuli short and sparse. China (Beijing, Hebei, Henan, Shanxi, Tianjin) .................................... M. maculipennis Wei & Li, 2009 3. Hind tibia entirely black....................................................... 4

3’. Hind tibia partly black, with brown or white maculae dorsally....................................................................................... 6

4. Head and thorax densely and coarsely punctured, without distinct microsculpture; hind tibia and metabasitarsus distinctly broadened; vein C and pterostigma yellowish-brown; middle serrulae of lancet with 17 to 21 denticles, subbasal tooth minute. China (Henan, Hunan, Shanxi) ..................... M. crassitarsalina Wei & Chen, 2002

4’. Head and thorax distinctly and densely punctured, not rugose; hind tibia and metabasitarsus slender, not broadened; vein C and pterostigma blackish-brown; middle serrulae of lancet with 7 to 10 denticles, subbasal tooth small .......... 5

5. Posterior margin of pronotum with distinct, narrow white band; hind trochanter mostly white, ventral surface with weak black macula; ovipositor sheath approximately 0.9× length of metabasitarsus; anal cell with middle petiole in forewing 1.35× length of vein 1r-m, 0.75× length of vein cu-a; serrulae of lancet straight, middle serrulae with 7 to 10 denticles, setae on annuli long and dense. China (Yunnan)......................... M. nigrotibia Wei & Huang, 2013

5’. Pronotum entirely black; hind trochanter entirely black; ovipositor sheath approximately 1.2× length of metabasitarsus; anal cell without petiole in forewing, with short and erect cross-vein; serrulae of lancet protruding, middle serrulae with 6 to 8 denticles, setae on annuli short and sparse. China (Liaoning)...... M. nigrotrochanterata sp. nov.

6. Hind tarsomeres entirely black............................................. 7

6’. Hind tarsomeres with distinct white maculae................... 13

7. Mesoscutellum with distinct white maculae........................ 8

7’. Mesoscutellum entirely black .............................................. 9

8. Pronotum, tergum 1 and hind femur entirely black; hind tibia with white macula at midlength, slightly shorter than 0.5× length of hind tibia. China (Hebei, Heilongjiang, Jilin, Liaoning, Tianjin); Russia (Siberia); North Korea........ ...................................................... M. sibirica Forsius, 1918

8’. Posterior margin of pronotum with distinct white bands; posterior of tergum 1 with 2 small transverse maculae; dorsal surface of hind femur with distinct white macula apically; hind tibia with white macula at midlength 0.5× length of hind tibia. China (Heilongjiang) ....................... ........................................... M. harbina Li, Liu & Wei, 2016

9. Labrum and clypeus entirely black..................................... 10

9’. Labrum and clypeus at least partly white, or labrum and clypeus entirely white .................................................... 11

10. Body length 8 to 9 mm; outer surface of hind coxa entirely black; anterior margin of clypeus not deeply incised, approximately incised to 1/4 length of clypeus. China (Liaoning, Gansu); Vladivostok.... M. potanini Jakovlev, 1891

10’. Body length 7.5 mm; outer surface of hind coxa with distinct white oval macula; anterior margin of clypeus deeply incised to approximately 1/2 length of clypeus. China (Gansu).......................................... M. soror Jakovlev, 1891

11. Posterior margin of abdominal tergum 1 medially with weak white maculae; all trochanters entirely black. China (Liaoning, Zhejiang); Japan...... M. carbonaria Smith, 1874

11’. Posterior margin of abdominal tergum 1 medially with a pair of small white maculae; fore and middle trochanters entirely black, hind trochanter white............................ 12

12. Hind trochanter mostly black; pronotum entirely black; hind femur 2.5× longer than white macula on outer surface of hind coxa. [Male: labrum and clypeus black except anterior margin of labrum white and base of clypeus with two small white maculae; outer surface of hind coxa with an oval white macula]. China (Anhui, Gansu, Henan, Hubei, Shaanxi, Shanxi, Zhejiang) ..... M. revertana Wei, 1998

12’. Hind trochanter mostly white; posterior margin of pronotum with distinct white band; hind femur at most 2× longer than white macula on the outer surface of hind coxa. [Male: labrum entirely and clypeus mostly white, base of clypeus black; pronotum entirely black; outer surface of hind coxa entirely black]. China (Gansu, Henan, Ningxia, Qinghai, Shaanxi, Sichuan)..... M. shii Wei, 2004

13. Oval white macula on outer surface of hind coxa not extending along its entire length; mesopleuron densely punctured and rugose, spaces between the punctures narrow.................................................................................. 14 13’. Oval white macula on outer surface of hind coxa extending along entire length of coxa; mesopleuron minutely and sparsely punctured, spaces between the punctures distinct............................................................................ 15

14. Labrum and clypeus partly black ( Fig. 6); mesoscutellum slightly elevated, but without transverse carina; posterior margin of pronotum with narrow white band ( Fig. 10); posterior margin of abdominal tergum 1 medially with two small transverse white maculae, remaining terga entirely black; fore and middle trochanters mostly black; white macula on dorsal surface of hind tibia as long as 0.5× tibia length. China (Hunan, Shaanxi, Zhejiang) ....... ............................................... M. convexina Wei & Li, 2013

14’. Labrum and clypeus entirely white ( Fig. 7); mesoscutellum with distinct transverse carina; posterior margin of pronotum with distinct and wide white band ( Fig. 11); apical 2/3 of abdominal tergum 1 with white maculae narrowing laterally, lateral corners of abdominal terga 2 to 7 with distinct white maculae, posterior margins of all sterna white; fore and middle trochanters entirely white; broad ring at midlength of hind tibia as long as 0.5× tibia length. China (Gansu, Henan, Hubei)............................... .......................................... M. tripidona Wei & Chen, 2002

15. Clypeus entirely, hind tibia and hind tarsi mostly yellowish-white; base of antennal flagellum very slender and sub-apical flagellomeres distinctly widened ( Fig. 8); postocellar area 2× broader than long, posterior margin very weakly carinate; outer surface of hind coxa black, without white macula; vein C and pterostigma yellowish-brown; serrulae feebly protruding, middle serrulae with 6 to 9 denticles. China (Guizhou, Henan, Hubei, Shaanxi) ........ ..................................... M. stigmaticalis Wei & Chen, 2002

15’. Clypeus, hind tibia and hind tarsi mostly black; antennae stout, sub-apical flagellomeres only slightly widened ( Fig. 9); postocellar area 2.5× broader than long, posterior margin sharply carinate; outer surface of hind coxa entirely white; serrulae distinctly protruding, middle serrulae with 5 to 6 denticles. China (Hebei, Shaanxi, Shanxi) .............. ....................................... M. maculoepimera Wei & Li, 2013