A revision of Macromalthinus Pic, 1919 with description of six new species (Coleoptera: Cantharidae: Chauliognathinae) Author Biffi, Gabriel Author Constantin, Robert text Papéis Avulsos de Zoologia 2018 Pap. Avulsos Zool., S. Paulo 2018-11-29 58 1 22 http://dx.doi.org/10.11606/1807-0205/2018.58.58 journal article 10.11606/1807-0205/2018.58.58 1807-0205 5384147 97C262C2-6F02-4916-9533-43653FE5561F Macromalthinus Pic, 1919 ( Figs. 1-65 ) Macromalthinus Pic, 1919: 14 ; Delkeskamp, 1939: 214 ; Blackwelder, 1945: 369 ; Miskimen, 1961: 24 ; Wittmer, 1963: 131 ; Magis & Wittmer, 1974: 93 ; Delkeskamp, 1977: 465 ; Brancucci, 1980: 298 ; Brancucci, 1981a: 259 ; Brancucci, 1981b: 331 ; Constantin, 2010: 40; Constantin, 2016: 5. Type species: Macromalthinus maximiceps Pic, 1919 (by monotypy). Diagnosis: Antennae filiform or slightly flattened, without strong modifications; head large, strongly narrowed posteriorly, vertex concave; eyes strongly developed, prominent; pronotum subquadrate to trapezoidal, constricted laterally near anterior angle; elytra short, exposing wings and abdominal tergites; elytra without sculptural modifications, apex round, slightly swollen; fore femur of males swollen, usually with a ventral tooth near apex; fore tibia slender, without modifications; tarsal claws simple,not toothed; abdomen of males with broad membranes between ventrites, ventrite VII H-shaped, broadly notched anteriorly and posteriorly, ventrite VIII convex, asymmetrical; aedeagus asymmetrical, median lobe elongate, curved; left paramere flat, partially covering dorsal surface of median lobe; right paramere entire, not divided or laterally projected; right prolongation of tegmen present, dorsal surface without apophysis; left setiferous prolongation present or absent. Distribution: Trinidad and Tobago , French Guiana , Brazil , Ecuador and Peru .