Hexachaeta cundiboyacensis

Key. The following modifications to the key of Hernández-Ortiz (1999) are provided to include H. cundiboyacensis :

1. Abdominal tergites entirely yellow or at most with lateral blackish spots on tergite 5 in male or 6 in female; oviscape yellow or dark brown.......................................................................................... 2

- At least abdominal tergites 3–5 entirely dark brown; oviscape dark brown;...................................... 1A

1A. All tergites, including syntergite 1+2, entirely brownish black; proximal hyaline mark in cell r 1 reaching vein R4+5; costal cell with dark marking occupying nearly of anterior mid length ( Figure 1. E View FIGURES 1–3 page 634); aculeus tip as in ( Figure 2. E–F View FIGURES 1–3 page 636) Venezuela.................................................................. H. nigriventris Hernández-Ortiz

- Syntergite 1+2 yellow with two brownish spots laterally, other tergites entirely dark brown ( Figs. 9–10 View FIGURES 9–10 ); proximal hyaline mark in cell r 1 projecting beyond vein R4+5 into br cell; costal cell entirely pale yellow except a narrow brown area on anterior margin ( Fig. 7 View FIGURES 7–8 ); aculeus tip as in ( Fig. 15 View FIGURES 15–16 ) Colombia....................... H. cundiboyacensis Rodriguez , new species