The genus Bittacus Latreille (Insecta: Mecoptera) in Brazil: key to species, distribution maps, new synonym, and three new species Author Machado, Renato Jose Pires Author Mendes, Diego Matheus De Mello Author Rafael, José Albertino text Zootaxa 2018 2018-11-30 4526 3 303 330 journal article 27885 10.11646/zootaxa.4526.3.2 0ea3c1bd-7938-4961-b91e-18b886ef1446 1175-5326 2611647 68ADEE66-00B7-4370-BF57-07C118ACDEB0 Bittacus geniculatus Erichson, 1848 ( Figs. 1d , 8l ) Bittacus geniculatus : Erichson, 1848 :586 ; Esben-Petersen, 1921 :150 , 1927:13; Penny & Byers, 1979b :368 ; Willmann, 1983 :55 ; Machado et al ., 2009 :36 ; Machado, 2018 . Thyridates geniculatus : Collucci & Amorim, 2000 :2 . Holotype male: ZMHB (high resolution images examined). Species known from Guyana and Brazil (not possible to determine the state). Bittacus geniculatus is a unique species, and rarely collected. It is known only by the male holotype from Guyana and another specimen from Brazil , reported by Esben-Petersen (1927) and held in the Helsinki museum. This specimen is likely from one of the Amazonian Brazilian states. Willmann (1983) did not include B. geniculatus in Thyridates , mainly because the first fork of Rs in the forewing does not form a right angle. However, the species was transferred to Thyridates by Collucci & Amorim (2000) , who includes it in the “group angrensis ”, based on its falcate forewing. Bittacus geniculatus , can be easily distinguished from the remaining species based on its extremely long pterostigma, Rs 1+2 not forking, and by the elongated male epandrium.