Volume 20   LOURENÇO W. R. 2­-12 First record for an Uropygi (Theliphonidae Lucas, 1835) from Chiapas amber, Mexico YTHIER E. 13-­22 A new species of Auyantepuia González-­Sponga, 1978 (Scorpiones, Chactidae) from Brazil ROSSI A. 23-­30 Three new genera of scorpions from North, Central and South America (Scorpiones: Chactidae, Diplocentridae, Vaejovidae) ROSSI A. 31­-35 Five new synonyms in the genera Babycurus Karsch, 1886 and Barbaracurus Kovařík, Lowe et Šťáhlavský, 2018 with a revalidation (Scorpiones: Buthidae) ROSSI A. & MERENDINO M. C. 36-­40 Sulla presenza di Loxosceles rufescens Dufour, 1820 nella provincia di Trapani, in Sicilia (Arachnida: Araneae)