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class=3D"A I appreciate you calling me on this one, Stephen, as I know virtually nothing about the differences. This other photo shows the wing(s) clearly and I thought the clear vein (on the right) was the spurious vein of the mimic. http://www.flickr.com/photo_zoom.gne?id=239985082&size=o Which features of the other image leads you to believe it is a "tachinid" fly. In this pic I have difficulty seeing the features mentioned in the NAS Guide. Thanks, Angus At 08:36 PM 9/10/2006, you wrote: >Angus, Jean, others, >Very nice pictures Angus, but when the mimic is very good how do you know >which >is the mimic and which the model? As devil's advocate on this, it doesn't >look >like the usual syrphid fly mimics I've seen here (going by the antennae) so >presumably it would have to be a stratiomyid (Stratiomyidae, soldier >flies, the >other group with many wasp mimics): this does fit with the club-like antennae, >but which also perhaps could be hymenopteran, of a mud-dauber maybe. To me, >the extreme waist and extremely pointy back end look more wasp-like, features >that strats don't usually copy well (less of a waist and a rounded abdominal >tip). There's enough motion blur due to take-off that you can't see how many >wings there are (looks like there could be two pairs but impossible to be >sure), and likewise can't see whether there are halteres or not. So from the >one picture alone, to me it could be either a wasp or or a mimetic fly. Did >you get a good look at it while it was stationary to resolve this, or did you >get other pictures that you could put up? > >The other one on the flower appears to a biggish tachinid, also a great >picture. >Steve >Choc Lake, Halifax. >***************************** > > >Quoting Angus MacLean <angusmcl@ns.sympatico.ca>: >>Usually the secret to good photos is recognizing the moment & reacting to >>it. Other times luck plays a big role. Such was the case with these two pics. >> >>This one catches the subject ready to lift off. One can almost feel the >>tension as it gets ready. (If your monitor is capable, click the >>"original size"). >> >>http://www.flickr.com/photo_zoom.gne?id=238045972&size=m >> >>This one is in the same vein but has an aesthetic quality to it. (Again >>click "original" for a larger pic). >> >>http://www.flickr.com/photo_zoom.gne?id=238045953&size=m >> >>Angus >> > >-- >Stephen R. Shaw Ph.D. >Dept of Psychology & Neuroscience >Dalhousie University >1355 Oxford Street >Halifax, Nova Scotia, Canada B3H 4J1 >e-mail: srshaw@dal.ca >phone: 1-902-494-2047 >fax: 1-902-494-6585
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