Fore wing hyaline; fore wing RS+Ma tubular on more than half its length; anterior transverse carina of propodeum reaching the lateral margin; median tergites mostly pale with posterior terga black.

Holotype: male. Body length 3.9 mm. Fore wing length 3.6 mm. Fore wing hyaline. Fore wing RS+Ma more complete. Scutellar sulcus with four longitudinal carinae. Median areola of propodeum with well-defined margins. Anterior transverse carina of propodeum reaching the lateral margin. Lateral longitudinal carinae of median tergite 1 well-defined. Median syntergite 2+3 1.1 times longer than wide.

Unknown.

Male mesoscutum varies from less melanic to mostly pale. Male propodeum varies bicolored to entirely pale.

Lytopylus sergiobermudezi is named in honor of Sergio Bermúdez in recognition of his participation in the collaborative development of the ICE-ACG geothermal project of Pailas II, northwestern Costa Rica.

Reared two times from Dichomerus santarosensis (Dichomeridinae, Gelechiidae) leaf-tier feeding on new foliage of Quercus oleioides (Fagaceae) in ACG dry forest at 420 m elevation.

Holotype ♂: Costa Rica, Guanacaste, Sector Mundo Nuevo, Punta Plancha, Area de Conservaciόn Guanacaste 10.7416N -85.42734W 420m., Mariano Pereira coll., food plant: Fagaceae Quercus oleoides, host caterpillar: Gelechiidae, Dichomeridinae, Dichomeris santarosensis, coll. date: 1/5/2009, parasitoid eclosion date: 1/19/2009, DHJPAR0034286. Paratype: [the following has the same data as the holotype except as indicated] DHJPAR0030601.