A revision of the genus Macrolygistopterus Pic, 1929 (Coleoptera, Lycidae, Calochromini) Author Ferreira, Vinicius S. text Zootaxa 2016 4105 4 321 338 journal article 10.11646/zootaxa.4105.4.2 23dcb341-8737-42cb-bef7-7f29437f2788 1175-5326 271306 07266FCB-8D6E-4AEA-9159-ECE7D8D31ED0 Key to the species of Macrolygistopterus 1. Elytra entirely bluish black.............................................................................. 2 - Elytra with basal portion testaceous or reddish and apical third to half black or bluish black........................... 3 2. Apical portion of elytra widened; costa I subapically fused with costa IV, forming an arch subapically; costa II approximately touching the middle apex of the arch formed by costae III+IV; costa III partially obliterated after elytral apical half, fused with costa II and IV at the 4/5 elytral ( Figs. 3 , 29 ). Pronotum trapezoidal, glabrous, with anterior and lateral margins thickened, pronounced ( Fig. 21 ).............................................................. M. caeruleus (Gorham, 1881) - Elytra subparallel, not broadened distally; elytral costae I and II apically fused; costa III and IV fused apically ( Figs. 5 , 31 ). Pronotum rectangular, densely pubescent, with anterior and lateral margins thin ( Fig. 23 ).......... M. grandjeani Pic, 1930 3. Pronotum black, glabrous, strongly sculptured ( Fig. 19 ), if testaceous with a slender black stripe restricted to the middle of the median elevations. Arrangement of elytral costae: costa I subapically obliterated, costae II and IV subapically fused forming an arch; costa III apically fused with the arch formed by costae II+IV, with parallel lines between costae II and III, in some specimens parallel lines very obliterated ( Figs. 1 , 27 )................................. M. succinctus ( Latreille, 1811 ) - Pronotum testaceous, scarcely pubescent, with a broad black longitudinal stripe. Arrangement of elytral costae not like above....................................................................................................4 4. Pronotum more or less pentagonal, with anterior margins rounded................................................ 5 - Pronotum more or less subtrapezoidal.....................................................................6 5. Rostrum short ( Fig. 18 ); costa I and II apically fused, forming an arch; costa III subapically fused with the arch formed by costae I+II; costa IV following alone without touching the elytral apex ( Fig. 35 )........................ M. kirschi Pic, 1931 - Rostrum long ( Fig.17 ); costae I and IV apically fused, forming an arch, with elytral 4/5 strongly obliterated; costa III obliterated at elytral 4/5; costa II reaching elytral apex, crossing the arch formed by costae I+IV, obliterated after the arch ( Fig. 35 )..................................................................................... .. M. simoni Pic, 1930 6. Elytral costa I reaching elytral apex, subapically obliterated; costae II and IV subapically fused, forming an arch, subapically obliterated; costa III not touching the arch formed by costae II+IV ( Fig. 30 ). Adjacent area of scutellum black ( Fig. 30 )....................................................................................... M. germaini Pic, 1930 - Arrangement of elytral costae not like above. Adjacent area of scutellum of the same color of basal portion of elytra....... 7 7. Costa I and II fused subapically, apex of costa I apically obliterated; costa III subapically obliterated and fused to the outer margin of II; costa IV reaching elytral apex, with an oblique obliterated line linking costa II and IV ( Fig. 32 )............................................................................................. M. subparallelus Pic, 1930 - Costa I and IV not fused to any other, both free; costae II and III subapically fused, this fusion continuing into a single costa (II+III); elytral costae not reaching elytral apex. Rostrum black or testaceous..................................... 8 8. Rostrum testaceous; apical region of ventrite VII of females notched, forming two acuminated apices ( Fig. 40 ); antennomere IV subequal to III in width; elytral costae slightly distinct ( Figs. 8 , 33 )...................... M.testaceirostris Pic, 1930 - Rostrum black; apical region of ventrite VII of females notched, forming two rounded apices ( Fig. 37 ); antennomere IV distinctly wider than the others; elytral costa distinctly visible ( Figs. 2 , 28 )................ M. quadricostatus ( Buquet, 1842 )