Revision of Pseudastenus Bernhauer, synonym with Xenasterides Newton and six new species (Coleoptera, Staphylinidae, Paederinae) Author Busanello, Dilson G. C. Author Irmler, Ulrich Author Caron, Edilson text Zootaxa 2020 2020-03-23 4755 1 139 154 journal article 10.11646/zootaxa.4755.1.6 9f6752d6-7c9a-4756-acfe-badb2a0301d0 1175-5326 3724291 D0B3FFA8-C262-4CD6-98AB-B46C55FCEF6D Key to species of Pseudastenus Bernhauer 1. Elytra shorter than pronotum, 0.9 times as long as pronotum, sides divergent to posterior margin, widest at posterior margin. ................................................................................................... 2 - Elytra longer than pronotum, ranging between 1.1 and 1.4 times as long as pronotum, sides slightly curved, widest in front of posterior margin...................................................................................... 4 2. Eyes reduced, approximately only 0.20 times as long as total length of head; postocular length more the two times longer than eyes; elytra unicolored or not conspicuously bicolored........................................................ 3 - Eyes less reduced, approximately 0.30 times as long as total length of head; postocular length only 1.6 times as long as eyes; elytra conspicuously bicolored, with distinct black anterior half......................................... P. barretoi 3. Eyes slightly larger; postocular sides approximately parallel; elytra slightly bicolored, anterior half of elytra indistinctly darker than posterior half.......................................................................... P. ribeirocostae - Eyes slightly smaller; postocular sides divergent; elytra unicolored yellow................................ P. schubarti 4. Eyes large, 0.33 times as long as total length of head; postocular length equal to eye length................... P. oculatus - Eyes smaller, between 0.24 and 0.31 times as long as total length of head; postocular length distinctly longer than eye length ................................................................................................... 5 5. Pronotum light brown; elytra with basal half darker than apical half (in some specimens not so conspicuous)............. 6 - Pronotum rust brown to reddish; elytra with basal two-thirds darker than apical onethird................... P . ferrugineus 6. Larger, at least 3.00 mm long; elytra bicolored, dark brown to black in anterior half and light brown in posterior half; aedeagus with apical sclerites of internal sac not elongate............................................................. 7 - Smaller, 2.20 mm long; elytra unicolored light brown; aedeagus with apical sclerites of internal sac elongate and straight............................................................................................ P. amazonicus 7. Head light brown; median lobe of aedeagus with apical sclerites entirely narrow and S-shaped ( Figs. 46–47 ).... P. plaumanni - Head dark brown; median lobe of aedeagus with apical sclerites broad on the basal half and not S-shaped ( Fig. 50 )... P . latus