Allegheny or Illinois River Cruiser?? (DDF863) - Macromia illinoiensis

Moved

… Cliff Bernzweig, 22 July, 2013 - 11:36pm

Swift (Illinois)

This is illinoiensis. Male M. alleghaniensis has a complete yellow ring around S7, and a nearly complete band around S2, broken dorsally only (but very rarely complete). In the hand, the mesotibial keel of the male is about 20% of the length of the tibia on Allegheny, while it is 25-50% on Swift. These differences do not apply to females.

… Ben Coulter, 17 July, 2013 - 6:14pm

Thanks

Thanks very much. Appears I've misidentified several other cruisers.

… Fred Siskind, 17 July, 2013 - 6:31pm

Macromia

That area should have both Swift (Illinois form) and Allegheny River Cruisers present, so keep looking! Check out this page on MD cruiser identification by Dave Czaplak.

http://www.odolep.com/d_macromiinae/macromia_id.htm

… Ben Coulter, 17 July, 2013 - 6:40pm

Request

Could you check photo I just added to an earlier request - closeup of abdomen and S7 - Photo#806315
Per your comments and looking at the other photos, I believe the previous photo is also an Illinois.

Thanks.

… Fred Siskind, 17 July, 2013 - 6:55pm