find out what he used, when he sprayed, and what the temperatures were like from the day he / she sprayed and for the next three days. 

i will do a little more digging to see about catalpa.

J

On looking back in my notes: We had our lawn sprayed in April - before the Catalpa leafed out so the damage did not correspond to that spraying. The date when I first noticed the leaves was June 8th. In my records, June 5th was when the co-op sprayed the corn field with, probably, roundup. That field is directly south of our lawn where the catalpa stands. I can't find the temperatures for those days, although the National Weather Service probably has it on their website if you know where to look. I can't be positive I am seeing new damage, I don't often see this tree up close. I've added another view of damaged leaves. Thanks for any insight you can offer.

that really looks like a herbicide growth regulator damage. i would bet dicamba, or a 2,4,D type herbicide. the curling and thickening of the veins looks suspect. i think the best and only think to do is wait and see next year. if you are concerned about potential litigation i would call IDALS pesticide bureau and they can collect samples etc and test them for residuals.
J