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Boxelder Bug Nymphs: Eastern or Western? - Boisea

Boxelder Bug Nymphs: Eastern or Western? - Boisea
Granite Basin outside of Prescott, Yavapai County, Arizona, USA
October 4, 2006
Boisea species. This is just a small part of an impressively huge aggregation ... underneath a Boxelder Maple (Acer negundo). Elevation 5,600 Ft (~1,705 m).


Hey David
Did you ever take any photos of adults? Now would be a good time. I have a sneeking suspicion that these are really Eastern Boxelder Bugs. Apparently that is the species seen in Yavapai County (or perhaps both).

Sort of related, I think the two "species" are likely just regional variants of the same species. Mostly in the Rockies and south into Arizona and New Mexico they are "Eastern", but some individuals have some reddish on the veins and perhaps the two "species" actually intergrade in this region. There are photos on the internet (one on BugGuide) of ones with black veins mating with ones that have somewhat orange main veins on the tegmina. None of the ones in the Rockies have the prominent red/orange veins that the ones further west have (that I've seen so far anyway).

And, even well east of the rockies some show some reddish on the veins.

Hi David
I did a quick check and found no images of adults. Now that I know what to look for, I can take some pictures and do a quick and dirty approximation of of the ratio of the two forms.


Good point -
Collection &/ or photos of adults would be helpful since their populations do overlap in some places in AZ.

Should be B. rubrolineata
since you're to the west of the Rocky Mountains. For an image of B. trivittata nymphs see here: Boisea trivittata.
By the way, this species is misspelled on bugguide; valid names are B. rubrolineata, and B. trivittata (see ITIS Report). Many websites, nevertheless, cling to the incorrect spelling. This statement seems to hold for many other names.

Thanks Hartmut
I tried to find a distribution map for B. trivittata but failed. The bugs depicted in the link you posted look like the bugs I posted with the yellow markings on the back etc. but perhaps an instar or two more mature. On your say-so I'll move this submission to B. rubrolineata.

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