 In 1884, he described a species of gibbon, the Eastern black crested gibbon, which unfortunately, in this modern century, is critically endangered.In 1891 it was widely, but erroneously, reported that Künckel d'Herculais had been killed and eaten by a swarm of locusts in Algeria.He was elected president of the Société entomologique de France in the years 1808 and 1909.