Posted by Jan Willem on 13-08-2006 15:08
#14
Hi Nikita,
Maybe the attached pictures will give you some help (left is
G. balachowskyi; right is
G. hackmani). Sorry for the bad quality of the pictures!
Drake (1993) says:
Tips of the surstylar lobes terminate in an inwardly directed finger-like extension. Postnotum yellow, or at least more similar in colour to the rest of the thorax than to the abdomen. Females are not separable .... G. balachowskyi Mesnil
Tips of the surstylar lobes curved backwards with a slightly expanded rectangular end. Postnotum obviously darker than the rest of the thorax in all male specimens seen ........ G. hackmani Nartshuk
In my experience, the colouration of the postnotum is not a totally reliable character! Furthermore the females are separable by the shape of sternite 8 (see picture).
Jan Willem
Edited by Jan Willem on 13-08-2006 15:11