Key for the species of Sinchocoris, modified from Dougherty (1995)

1. Ratio of visible labial segments: 5:3:1; ventral margin of middle femora with papillae at basal portion (Figs. 9, 13); spongy fossa of fore and middle tibiae moderately developed, at least one-quarter the length of fore tibiae..................... 2

- Ratio of visible labial segments: 2:2:1; ventral margin of middle femora without papillae; spongy fossa of fore and middle tibiae very small, approximately 1/12 times the length of fore tibiae (Fig. 22).............................. giupponii sp. nov.

2. Total length less than 8.0 mm; fore femora with dense, elongate pubescence; middle femora with scattered numerous setae, without forming a ventral fringe (Figs. 8–9)......................................... colombiensis Dougherty, 1995

- Total length more than 9.0 mm; fore femora with sparse, elongate setae, generally restricted to ventral fringe; middle femora with a ventral fringe of setae (Figs. 12–13)........................................... panamensis Dougherty, 1995