The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839) Soldati Lacerda, Déborah S. Monteiro Machado, Angelo B. Zootaxa 2019 2019-09-10 4668 2 207 228 5MCQ Rambur 1842 [352,520,1536,1562] Insecta Pseudostigmatidae Mecistogaster Animalia Odonata 2 209 Arthropoda genus    1. Costal margin at level of pseudostigma of HW not projected anteriorly; cerci in lateral view straight...........  M. linearis  1’. Costal margin at level of pseudostigma of HW abruptly projected anteriorly ( Fig. 12); apex of cerci in lateral view bent ventrally ( Fig. 28)........................................................................................ 2   2. Anterior hamule with alula ( Fig. 17)...................................................................... 3  2’. Anterior hamule without alula ( Fig. 18).................................................................... 4   3. Mesepimeron totally reddish-brown ( Fig. 9); penis segment 2 inectal view with one lateral elevation, in lateral view with contour foot-shaped ( Figs 23, 24)....................................................................  M. amalia  3’. Mesepimeron with reddish-brown area restricted to lower 1/5 of sclerite ( Fig. 8); penis segment 2 inectal view with two lateral elevations, in lateral view with contour not foot-shaped ( Figs 25, 26)...........................  M. nordestina  sp. nov.   4. Mesepimeron with reddish-brown area restricted to lower 1/5 of sclerite ( Fig. 8); contour of penis segment 2 inlateral view with dorsal and ventral margin straight ( Fig. 22), apex of inner fold projected ventroapically as a tubercle ( Fig. 22)...........................................................................................  M. kesselringi  sp. nov.  4’. Mesepimeron totally reddish-brown ( Fig. 9); contour of penis segment 2 inlateral view with dorsal margin undulated and ventral margin with a semicircular elevation at midlength ( Fig. 20), apex of inner fold hardly visible, not projected ventroapically ( Fig. 20)..............................................................................  M. mielkei  sp. nov.