[Leica] IMG: Another Swallowtail and an Unknown Insect

[jhnichols at bellsouth.net (Jim Nichols)]

Our patio flowers continue to attract subjects for photos, though the 
subjects are never very cooperative. Two examples are attached, and I need 
help identifying one of the insects.

This Black Swallowtail shows up most days, but never stays long.  Today, I 
got an opportunity for an image.

http://gallery.leica-users.org/v/OldNick/Another+Swallowtail.tif.html

This unknown specie, larger than most bumblebees and having an unusual rear 
shape with no evident stinger, shows up each day, but this is the first time 
I could get near it with my camera. The wings never stop moving, even when 
it rests on a bloom, so a photo presents quite a challenge.

Can anyone identify this one?  I have looked at all our reference books, and 
searched online, but have seen nothing like it.

http://gallery.leica-users.org/v/OldNick/Unknown+Insect.tif.html

Comments and critiques welcomed.

Jim Nichols
Tullahoma, TN USA