While 1 was observing reproductive behavior in Hetaerina cruentata (Ramb.) in Xalapa, Ver., Mexico in September 1992.1 recorded some additional information for B. vivax , which occurred at high frequency in the study site. Observations were principally directed towards the timing and description of copulation and oviposition behavior as well as territorial behavior and interactions among males. Recordings were made during five days: 6, 18. 19. 20 and 24 September. The study site was the Rio Sordo (19°30'N 96°95’W). Twelve individuals were marked, using an ink pen and quickly releasing them, however, marked animals were never resighled.