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Brachinus 2 - Brachinus imporcitis

Brachinus 2 - Brachinus imporcitis
San Pedro River, Cochise County, Arizona, USA
June 7, 2011
Size: 6.5 mm

Moved from Bombardier Beetle.

Brachinus imporcitis
Wendy Moore at the UA insect collection examined the particular specimen that is pictured here and confirmed it to be B. imporcitis

Thank you
for following up.

Brachinus nr. imporcitis Erwin, 1970
tentatively based on my microscopic examination of this specimen which is now a photo-voucher in the P.W.Messer collection. Thanks Eric.

This small species is known only from AZ with records from Cochise County documented by Erwin (1970).

The voucher specimen would fit B. imporcitis in the taxonomic key by Erwin, except for the annoying observation that the 3rd antennomeres are completely pale. But surprisingly, the image does show the required darkened 3rd antennomeres. I therefore wonder if the voucher is the same as the specimen photographed here? If indeed the same specimen, I can not explain the discrepancy in coloration of the 3rd antennomeres. I measured the voucher to be ~ 7 mm long.

could be different specimen
I had three of these in a vial together, and the other two I have pinned here. I may have accidentally sent a different specimen to you than the one that is pictured. I can check the two specimens I have tomorrow for the darkened 3rd antennomere.

More specimens
of this kind for me to examine would certainly help establish the identity. Please understand that there needs to be a one-to-one correspendence of image-to-specimen for the photo-vouchering process to work. Thanks Eric.

Both specimens I have possess the darkened 3rd antennomere as is pictured in this one. I should have been more careful to send the exact specimen that I photographed. These three were all from the same collection event, do you think the 3rd one that I sent could be something else?

Possibly different species.
Eric, if it is important to you (it is to me for resolving a difficult determination), I suggest that you mail me the other two specimens from same collection event. I would mail you back one of them, assuming same species.

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