There are many species of yellowjacket wasp. A good key to NW
U.S. species, by Matthew Kweskin, Evergreen State College, can be found at
http://www.evergreen.edu/user/serv_res/research/arthropod/TESCBiota/TESCBiota.html
A publication that will answer most of your questions is the
W.S.U. publication, "Yellowjackets and Paperwasps", at
http://www.cahe.wsu.edu/infopub/eb0643/eb0643.html
Cheers,
Dave Pehling
============================================
| W.S.U. COOPERATIVE EXTENSION-SNOHOMISH CO. |
| 600 128TH ST. S.E. |
| EVERETT, WA. 98208 U.S.A. |
| PHONE - (425)338-2400 |
| FAX - (425)338-3994 |
| EMAIL [log in to unmask] |
============================================