The species of Haploglenius of French Guiana are reviewed, and an identification key to the species occurring in the arrondissement is presented. A new species of the genus, Haploglenius legnotos, tentatively inferred to be endemic, is described, figured, and compared with congeners. It is diagnosed by its relatively short antennae among species in the genus, the presence of a well-developed pronotal valve in males, the HW cubital field with two rows of cells, the pterostigmata pale, and the wing pattern distinctive, the last character being unique in the genus. Diagnostic characteristics placing the new species within Haploglenius are discussed. The species H. abdominevittatus Ardila Camacho and Jones is newly recorded from the region. A distribution map of Haploglenius in French Guiana is provided, as is a DarwinCore-compliant database of material examined.
Keywords: Identification key; Neotropical region; South America; new record; owlflies.
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