Identification
A. isoceles is one of only two brown hawkers found in Europe, the other is A. grandis. Both have a brown thorax and abdomen but A. isoceles has green eyes and clear wings and a diagnostic yellow triangular mark on the second abdominal segment. The hindwings have an amber patch at their base. In contrast A. grandis has yellowish wings and blueish eyes. The green eye of A. isoceles stand out even in flight and in practice it is not difficult to tell these two dragonflies apart. In addition to the morphological differences A. isoceles is on the wing much earlier in the year than A. grandis.
Read more about this topic: Aeshna Isoceles