Its nests feature flexible and dynamic qualities, and they are commonly seen under roofs of houses and huts in rural areas.

Additionally, there is a general trend of decrease percent cell wall sharing with increase in suspension length.

[5][6] Such habitat choice is unique to P. mellyi, since Stenogastrinae species population is rarely found in places disturbed by human contact and civilization.

[2] These droplets play an important role in development stages, since in the form of these white abdominal secretions do the eggs receive attention from adult females.

[1][6] One of the behavioral characteristics of Parischnogaster species is its frequent patrolling activity and is extensively found in P. mellyi and P. nigricans serrei.

[1] It remains to hover for a number of seconds, and then turns around to make a long roundabout, typically horizontally to the left and right.

When hovering around the landmark, P. mellyi typically extends and contracts its gaster (posterior abdominal region) to display the three white stripes on its tergites.

An observation study has shown that a male is typically active for 3 weeks or more (up to 32 days), rarely lands while hovering (but does so more frequently towards the end of a patrolling session by walking along the edges of leaves nearby), and feeds themselves at food sources at the end of activity and returns to its nests or communal resting points.

[3] In contrast, female P. mellyi appears at patrolling landmarks around the second hour of male activity to engage in sexual interactions.

By scoring endurance (measured in flight/ patrol time), females can gather reliable and valid information on a male’s quality.

[1] The characteristic three white stripes on the abdomen of male P. mellyi plays an important role in determining wasp behavior in both intra- and intersexual contexts of the species; the armament-ornament model proposes that the presence of ornaments (in this case, the active display of three white stripes) to be seen as a status badge that is used for both male-to-male competition and courtships for future mates.

[3][9] During patrol activity over its hover sites, male P. mellyi openly displays its three white stripes on its tergites by fully distending its abdomen.

Therefore, while stripes were indicators of strength in aerial duels, this sort of status badge was also attractive to females, as predicted by the Armament-Ornament Model.

Damages caused by raids from this hornet can be characterized by gaping holes that are torn out on the sides of the cells.

[1] Volatile fraction of P. mellyi venom contains some spiroacetals, which in Polistes and Vespa species seems to serve as a function of alarm pheromones.

Previous behavioral bioassays conducted 14 years ago showed no positive correlation between the venom of the Stenogastrinae species and the function of alarm pheromones.