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Photo#2067278
Boisea on topkilled Acer negundo - Boisea trivittata

Boisea on topkilled Acer negundo - Boisea trivittata
Sevenmile Creek, 8 km NW of Helena, Lewis and Clark County, Montana, USA
August 30, 2021
Size: 11.6 mm
Hemipteran, black wings with narrow orange stripes, 10+ landing on tips of branches in the upper half of the canopy of a topkilled Acer negundo - not on live shoots near the base. Ruderal floodplain community with Kochia scoparia, Chenopodium simplex, Chenopodium berlandieri, Helianthus annuus, and Cleome serrulata. Mid-afternoon, sunny, 79 F, good air quality, light air varying to light breeze.

Elevation ca 4000 feet. Disturbed riparian corridor on stream restoration site within a patchwork of native and non-native grassland.

Keyed to genus in Slater & Baranowski 1978 (where treated as Leptocoris). Family characteristics include numerous veins in the FW membrane; conspicuous, tuberculate ocelli; the pronotum with a median ridge; and the metathoracic scent gland openings small or absent. Within the family, the large size and particular pattern of red coloration on the pronotum and coria seems fairly distinctive; other characteristics to look for include the lateral notch just behind the anterior margin of the pronotum; the lack of prominent spines on the hind femora; and the bucculae only about half the length of the head. Within the genus, however, distinguishing between the western B. rubrolineata and the eastern B. trivittata seems a bit more fraught. This seems more like B. rubrolineata based on the raised, reddish veins on the corium (but some of the veins are black on this specimen); however, there seem to be a number of BugGuide photos identified as B. trivittata that also have this character. Help would be appreciated!

Images of this individual: tag all
Boisea on topkilled Acer negundo - Boisea trivittata Boisea on topkilled Acer negundo - Boisea trivittata Boisea on topkilled Acer negundo - Boisea trivittata

Moved
Moved from Boisea.

Moved
Moved from ID Request.

Looks more like trivittata to me, but let's get some other opinions.

 
Thanks!
I was able to get a copy of a paper by Schaefer, 1975, comparing these two ("A Re-assessment of North American Leptocoris"). He found that they were indistinguishable by measurements of various body parts and examination of genitalia, but could consistently be distinguished by the venation on the coria. "Populations of trivittatus vary considerably with respect to the amount of red on these veins, but none approaches the condition in rubrolineatus," he wrote. The corial veins are all red in rubrolineatus, vs. "not all red; decreasing red to east" in trivittatus. With that information, and the partially red/partially black corial veins of this specimen, I feel content to move this one to B. trivittata.

Boisea trivittata examples with reddish veins:
This is why I am hesitating to identify this one as B. rubrolineata...



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