The Thripidae subfamily Sericothripinae (Thysanoptera) from Saudi Arabia with a new species of Hydatothrips Karny Author Rasool, Iftekhar 0000-0002-8955-2340 irasool @ ksu. edu. sa; https: // orcid. org / 0000 - 0002 - 8955 - 2340 irasool@ksu.edu.sa Author Soliman, Ahmed M. ammsoliman@gmail.com Author Alattal, Yehya Zaki 0000-0002-8164-7636 yalattal @ KSU. EDU. SA; https: // orcid. org / 0000 - 0002 - 8164 - 7636 Author Al Dhafer, Hathal M. hdhafer @ ksu. edu. sa; http: // orcid. org / 0000 - 0002 - 4911 - 2332 hdhafer@ksu.edu.sa text Zootaxa 2021 2021-01-13 4908 1 29 40 journal article 8857 10.11646/zootaxa.4908.1.2 dca94007-2ae6-4e2c-b937-439e79a71a9a 1175-5326 4435706 8481BD48-D4DB-48D4-A308-561AF6599977 Key to the genera and species of Sericothripinae from Saudi Arabia 1. Metasternal plate anterior margin with deep U- or V-shape invagination medially ( Figs 2 , 9 )............. Hydatothrips ... 2 - Metasternal plate anterior margin either transverse ( Fig. 19 ) or with shallow emargination medially ( Fig. 26 )................................................................................................. Neohydatothrips ... 3 2. Ocellar triangle closely striated ( Fig. 1 ); metanotum longitudinally striate ( Fig. 3 ); setal pair S3 on abdominal tergites IV–VI at posterior margin, with only three setae anterior to S3 ( Fig. 4 ); tergite IX with three pairs of mid-dorsal setae ( Fig. 5 ); abdominal segments IV–V yellow ( Fig. 32 )............................................................. H. adolfifriderici - Ocellar triangle with widely spaced striae ( Fig. 8 ); metanotum longitudinally reticulate ( Fig. 10 ); setae S3 on abdominal tergites IV–VI placed far ahead of posterior margin, with 6–8 setae anterior to S3 ( Fig. 11 ); tergite IX with two pairs of mid-dorsal setae ( Fig. 13 ); abdominal segments reddish brown ( Fig. 34 )......................................... H. bahaensis sp. n. 3. Occipital apodeme confluent with posterior margin of compound eyes ( Fig. 16 ), ocellar setae pair III arising at external margin of triangle and shorter than distance between their bases; metasternal plate with anterior margin transverse ( Fig. 19 ); sternites without discal microtrichia or posteromarginal comb ( Fig. 20 ); tergite IX with only one pair of mid-dorsal setae ( Fig. 21 ); abdominal segments I–VI unicolor pale yellow to white, without trace of shadings ( Figs 36, 37 )................ N. amygdali - Occipital apodeme widely spaced from posterior margin of compound eyes ( Fig. 25 ), ocellar setae pair III arising inside the triangle and longer than distance between their bases; metasternal plate with anterior margin shallowly invaginated ( Fig. 26 ); sternites with discal microtrichia and III–VI with postero-marginal comb ( Fig. 29 ); tergite IX with two pairs of mid-dorsal setae ( Fig. 30 ); abdominal segments largely brown, except tergites IV–V yellow medially ( Fig. 38 ).............. N. samayunkur