Neohydatothrips, John, 1929

Masumoto, Masami & Okajima, Shûji, 2020, Two new species of Neohydatothrips John (Thysanoptera, Thripidae) from Japan with a record of micropterous N. elaeagni (Kudo), Zootaxa 4869 (3), pp. 404-412 : 405-406

Key to Japanese species of Neohydatothrips

1. Fore wing banded on distal three-fourths ( Figs 4–6 ).......................................................... 2

-. Fore wing not banded, uniformly dark or shaded on distal three-fourths ( Figs 1, 3 ).................................. 3

2. Fore wing with 3 dark and 3 pale areas, pale at apex, second vein with no setae ( Fig. 6 ); abdominal segments V–VI pale brown to brown, never pale; pronotum pale with dark distinct blotch; abdominal sternites III–VI with discal and posteromarginal microtrichia throughout; in female tergite IX with 2 pairs of MD setae.................................... samayunkur

-. Fore wing with 3 dark and 2 pale areas, dark at apex, second vein with 1–2 setae ( Fig. 21 ); abdominal segments V–VI pale; pronotum pale with slightly shaded blotch ( Fig. 18 ); abdominal sternites III–VI without discal and posteromarginal microtrichia medially ( Fig. 24 ); in female tergite IX with 3 pairs of MD setae ( Fig. 23 )........................... fascipennis sp. n.

3. Occipital area behind compound eyes long, distance between posterior margin of compound eyes and occipital ridge at least twice as long as diameter of an ommatidium ( Fig. 10 ); postoccipital area not developed, length at most as long as diameter of an ommatidium; pronotum with no long setae............................................................... 4

-. Occipital area behind compound eyes short, posterior margin of compound eyes close to occipital ridge, distance between posterior margin of compound eyes and occipital ridge at most as long as diameter of one ommatidium; postoccipital area developed, sculptured or reticulate; pronotum with a pair of long setae at posterior margin........................... 5

4. Antennae 7-segmented; body largely dark; pronotum polygonally reticulate, with dark blotch; postoccipital area absent, at least invisible; all legs dark; in female abdominal tergite IX with 3 pairs of MD setae; male sternites III–VII each with a large oblong pore plate................................................................................... reticulatus

-. Antennae 8-segmented ( Fig. 11 ); body distinctly bicoloured; pronotum transversely reticulate, without distinct blotch; postoccipital area short and transversely sculptured ( Fig. 10 ); all legs largely pale; in female abdominal tergite IX with 2 pairs of MD setae ( Fig. 14 ); male unknown................................................................. bicolor sp. n.

5. Abdominal tergites with narrow posteromarginal craspeda bearing microtrichia........................... gracilicornis

-. Abdominal tergites without posteromarginal craspeda........................................................ 6

6. Abdominal tergites II–III and VI with pair of semi-oblong dark patches; in female tergite IX with 4 pairs of MD setae................................................................................................... tabulifer

-. Abdominal tergites without such semi-oblong dark patches; in female tergite IX with at most 3 pairs of MD setae......... 7

7. Abdominal segments distinctly bicolored, with 2 pale segments; tibiae yellow; pronotal blotch not constricted medially, anterior margin almost straight............................................................................ medius

-. Abdominal segments almost uniformly dark, often one segment slightly paler but never distinctly bicolored; tibiae dark; pronotal blotch more or less constricted medially, anterior margin concave.......................................... 8

8. Abdominal tergites IV–VI with 4–7 setae outside of S3 (posteromarginal setae); sternites entirely covered with microtrichial rows; male sternite VII with a small pore plate..................................................... mitubautugi

-. Abdominal tergites IV–VI with 3 setae outside of S3 (posteromarginal setae); sternites without microtrichial rows medially; male sternite without pore plate or male unknown........................................................... 9

9. Ocellar setae III situated on anterior margin of ocellar triangle; pronotum with anastomosing transverse lines, blotch constricted at middle; abdominal tergites without wrinkles at lateral microtrichial fields, tergites VII and VIII without microtrichia posteromedially, female tergite IX with 2 pairs of anterior setae; tegula without microtrichia; male unknown; often micropterous ( Figs 8 & 16 )....................................................................................... elaeagni

-. Ocellar setae III situated distinctly lateral to anterior margin of ocellar triangle; pronotum with transverse reticulations bearing small wrinkles, blotch not constricted at middle; abdominal tergites with wrinkles at lateral microtrichial fields, tergites VII and VIII with microtrichia throughout, female tergite IX with 3 pairs of anterior setae; tegula with microtrichia; male without pore plate; always macropterous..................................................................... ponyaunpe

Figures

FIGURES 1–9. Neohydatothrips species. (1) N. bicolor sp. n., female. N. elaeagni, female, 2–3: (2) Microptera; (3) Macroptera. N. fascipennis sp. n., 4–5: (4) Female; (5) Male. (6) N. samayunkur, female; (7) N. bicolor, sp. n., female; (8) N. elaeagni, female microptera; (9) N. fascipennis sp. n., male.

FIGURES 18–25. Neohydatothrips fascipennis, sp. n. Female, 18–24: (18) Head–metanotum; (19) Antenna; (20) Thoracic sterna; (21) Fore wing; (22) Abdominal tergites II–III, right side; (23) Abdominal tergites VI–XI; (24) Abdominal sternites VI–VII. (25) Abdominal sternite VII, male.

FIGURES 10–17. Neohydatothrips species. N. bicolor sp. n., female, 10–15: (10) Head–metanotum; (11) Antenna; (12) Metasternum; (13) Fore wing; (14) Abdominal tergites VI-XI; (15) Abdominal sternite V. N. elaeagni, female microptera, 16–17: (16) Meso- & metanota; (17) Abdominal tergites V–VI.