Review of the genus Pagastia Oliver (Diptera: Chironomidae: Diamesinae) from North America, with description of P. (P.) subletteorum sp. nov. Author Makarchenko, Eugenyi A. text Zootaxa 2019 2019-09-02 4664 1 115 128 journal article 25818 10.11646/zootaxa.4664.1.5 0497b481-e216-41a4-b1f8-fd732cb69ca1 1175-5326 3383574 F7CD7865-7A8E-44F4-9982-8F9E35A84FD9 Key to the known species of Pagastia Oliver of Holarctic region Males 1. Eyes hairy. Aedeagal lobes reduced (subgenus Hesperodiamesa Sublette ). Basal lobe of gonocoxite small..................................................................................... P. ( H. ) sequax ( Garrett, 1925 ) ( Fig. 18 ) - Eyes bare or pubescent. One or two aedeagal lobes present (subgenus Pagastia Oliver ). Basal lobe of gonocoxite large.... 2 2. Both median and lateral aedeagal lobes present. AR 2.5-4.2.................................................... 3 - Only lateral aedeagal lobe present. AR 1.0–2.42............................................................. 6 3. Antepronotum with dorsal and lateral setae in widely separated groups. Median aedeagal lobe digitated and widest in distal part................................................................................................ 4 - Antepronotum completely covered with setae. Median aedeagal lobe widest medially, then tapering abruptly and with the apex forming a sharp hook.......................................... P . ( Pagastia ) partica ( Roback, 1957 ) ( Figs.16–17 ) 4. Gonostylus subapical with "heel".................... P . ( P .) nivis (Tokunaga, 1936) ( Makarchenko 2006 , Fig. 180, 5–10) - Gonostylus subapical without "heel"...................................................................... 5 5. Apex of the gonostylus is angled.............. P. ( P .) orientalis (Tshernovskij, 1949) ( Makarchenko 2006 , Fig. 181, 1–5) - Apex of the gonostylus is broadly rounded............................................................................................. P . ( P .) altaica Makarchenko, Kerkis et Ivanchenko, 1997 ( Makarchenko et al. 1997 , Fig. 1 ) 6. Anal point absent. AR 1.0–1.2. Alula of wing with some setae............. P . ( P .) subletteorum sp. nov. ( Figs. 1–6 , 19–20 ) - Anal point present. AR 1.54–2.42. Alula without setae........................................................ 7 7. Anal point almost parallel-sided in dorsal view; lateral aedeagal lobe tapering to thin apex........................... 8 - Anal point tapering to apex; lateral aedeagal lobe wide in distal part............................................. 9 8. Anal point with rounded apex and without apical peg.................... P . ( P .) orthogonia Oliver, 1959 ( Figs. 7–13 , 21 ) - Anal point with pointed apical peg. AR 1,56–1.75............. P. ( P .) hidakamontana Endo, 2004 ( Endo 2004 , Figs. 1–6 ) 9. Anal point narrow, tapering to pointed apex, without apical peg; gonostylus in basal part with outer angle-shaped projection. AR 2.18–2.42................ P. ( P .) tianmumontana Makarchenko et Wang, 2017 ( Makarchenko &Wang 2017 , Figs. 17 ) - Anal point widest in basal part and thin apically, pointed and often with apical peg; gonostylus without outer basal projection. AR 1.81–2.10............................... P . ( P .) lanceolata (Tokunaga, 1936) ( Makarchenko 2006 , Fig. 180, 1–4)