Hey powrider, just off Deso a week ago. No bugs to worry about then, but bring the deet anyway, the skeeters can be murder.
In addition to the flat canyon glyphs, a nice hike is around the rincon at 3 canyon. We did a layover at the lower camp there, but the upper camp looked like the one to snag if open, real nice white sandy beach. Don't miss the rock creek hike, cool clear water, Chandler Canyon for more creek action and more glyphs.
Have experienced hypothermia in July on Deso (hard to believe), so as Restrac says, bring and keep the rain gear handy.
Watch out for the gravel bar in Dripping springs rapid. When we went thru there was a raft stuck on a tree there in the middle of the river. Just stay in the channel on the right side and you should be ok.
Have a great trip!
ps the "space cube" is currently orbiting mars, at least it was.... maybe it was just a reaction to the datura.....
heres a pic of the raft