1. Impatiophila yapingi species group, new

Diagnosis. Anteromost, posterior sensillum of cibarium not shorter than twice length of posteromost, medial sensillum (Fig. 3 A). Patch of dense, small setae or stout setulae present on caudoventral portion of epandrium (Fig. 5 B). Ovisensilla on ventral margin of oviscapt valve distally increasing or nearly constant in size (Fig. 6 E). Subapical, trichoid ovisensillum of oviscapt valve stout, longer than apical, peg-like ovisensillum (Fig. 6 E). Spermathecal capsule wider than long, apically somewhat round or flat in lateral view (Fig. 6 M).

Common characters. Cibarial, posterior sensilla slightly curved anteriad. Labellum with 6 pseudotracheae per side (small variation seen in I. trifurcatosternata). Hindleg tarsomeres I‒IV each with 1 black, apically blunt, stout spine at outer apex on underside (Figs. 3 K, 12A; unknown for I. limbicostata). Distal margin of surstylus deeply concave in ventral 2/3 (except for I. quadrangulata: moderately concave). Paramere more or less roundish on apical margin (except for I. quadrangulata: quadrangular as a whole) in lateral view. Aedeagal basal process longer than 1/2 of paramere. Oviscapt valve horizontally expanded at apical portion (except for I. yangi and I. forcipivalva: not distinctly expanded); lateral ovisensilla tightly arranged in a nearly straight (in ventral view) row on margin of apicolateral flap (except for I. yangi and I. forcipivalva); ovisensilla on ventral margin of valve entirely arranged at nearly equal intervals.