leptocerus group

Description. Antenna clavate or filamentous; foreleg longer than other legs; posterior fork of forewing vein CuP+1A reaches hind margin of forewing at level of radial sector; wings unmarked; foreleg tarsomere 1 at least twice as long as distal tarsomere, 2 slightly shorter or longer than distal tarsomere; midtibia not swollen; female terminalia without gonapophysis-like process extending from lateral margin of lateral gonapophysis, posterior gonapophysis longer than broad, weakly to moderately swollen.

Discussion. This group may be subdivided in the future since it contains some morphologically diverse species. The larvae of N. lithophilus and N. venezolanus are quite distinct morphologically. The antenna can be filamentous (N. lotti) or weakly clavate (N. lithophilus).