One-Shot Wednesday: two-striped grasshopper nymph

Melanoplus bivittatus (Two-striped Grasshopper) nymph | Jerseyville, Illinois

As the heat of summer solidifies its chokehold over the middle and southern latitudes of North America, grasshopper nymphs will begin to ramp up their development. I see grasshoppers commonly in my soybean field trials, where their feeding presents more of an annoyance to me than an actual threat to yields.

I photographed this particular individual on almost this same date last year in one of my Illinois soybean trials, not knowing for sure which species it represented. There was no particular reason for only taking this one single photograph, other than it was perched nicely when I saw it and that I did not feel like taking the time to chase it into another good pose after my first shot disturbed it.

Later in the season I saw numerous adults representing Melanoplus differentialis (differential grasshopper), a common species in this area, and assumed this was its nymph. However, a closer look at the photo suggests it represents the closely related M. bivittatus (two-striped grasshopper). While adults of these two species are easily distinguished based on coloration, the nymphs can look very similar (especially in their earlier instars) and are distinguished on the basis of the black femoral marking—more or less solid in M. bivittatus and broken into chevrons that create a “herringbone” pattern in M. differentialis.

Wing pad size and relative body proportions suggest this is a fourth-instar nymph.

Copyright © Ted C. MacRae 2012

About these ads

About Ted C. MacRae

Ted C. MacRae is a research entomologist by vocation and beetle taxonomist by avocation. Areas of expertise in the latter include worldwide jewel beetles (Buprestidae) and North American longhorned beetles (Cerambycidae). More recent work has focused on North American tiger beetles (Cicindelidae) and their distribution, ecology, and conservation.
This entry was posted in Acrididae, Orthoptera and tagged , , , , , , , . Bookmark the permalink.

3 Responses to One-Shot Wednesday: two-striped grasshopper nymph

  1. James C. Trager says:

    Speaking of these two grasshoppers, did you ever see this:
    http://bugguide.net/node/view/581677

Commentaria

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s