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Index of Subjects --Apple-Mail-22-619608244 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi Angus, On 1-Sep-06, at 11:29 PM, Angus MacLean wrote: > Thanks for your help. Chris. Following David's lead suggesting it > was a Eristalis, I found this one which identifies it as E. > arbustorum: > > http://bugguide.net/node/view/22697 There are 23 species of Eristalis and 33 species of Helophilus in North America and (see the Nomina Nearctica pages at: http://www.nearctica.com/nomina/diptera/dipsyrph.htm Eristalis arbustorum Linnaeus 1758 and Eristalis tenax Linnaeus 1758 are not (insofar as I am aware) synonymous (Nomina Nearctic list both specific names as valid). Eristalis arbustorum doesn't occur in Nova Scotia whereas both Eristalis tenax and Helophilus borealis are common species here. On the basis of the photograph, and examining specimens of both species, I couldn't tell which it might be. The two genera are differentiated (from Curran 1965) according to whether the femorae have patches of setulae on the anterior part of the base, and whether the third vein of the wing is strongly or only moderately curved into the apical cell - characters I can't make out from the photograph. All the best, Chris > > However E._x appears to be the same creature. > Angus > > At 08:45 PM 9/1/2006, you wrote: >> Hi Angus & David, >> >> On 30-Aug-06, at 9:04 AM, David & Alison Webster wrote: >> >>> Angus MacLean wrote: >>> >>>> >>>> Hopefully someone can name the family of this next (I think) >>>> Hover Fly. When I was searching the Net for a match, I came on a >>>> Hover Fly Society (for humans, not hover flies), British, I >>>> believe. (This individual could be a Drone Fly although I think >>>> I can detect the spurious vein in the wing. >>>> >>>> http://www.flickr.com/photos/58321572@N00/228628774/in/photostream/ >>> Hi Angus & All, Aug 30, 2006 >>> Great shot. >>> Your second picture is, as you indicate, a Hover Fly >>> (Syrphidae) and resembles my A325 that I have tentatively keyed >>> to Eristalinae; Eristalis (Eoseristalis). As far as I can take it >>> with Nearctic Diptera. >> >> It's a toss up: there are two possibilities: >> >> Eristalis tenax Linnaeus >> http://www.museums.org.za/bio/insects/flies/syrphidae/images/ >> eristalis_x.jpg >> http://www.uknature.co.uk/E.Tenax.jpg >> >> Helophilus borealis Staeg >> >> Both are common species in Nova Scotia. >> >> Cheers! >> >> Chris >> >> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._ >> ._._. >> >> Christopher Majka - Nova Scotia Museum of Natural History >> >> 1747 Summer Street, Halifax, Nova Scotia, Canada B3H 3A6 >> >> (902) 424-6435 Email <c.majka@ns.sympatico.ca > >> >> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._ >> ._._. _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _. Christopher Majka - Nova Scotia Museum of Natural History 1747 Summer Street, Halifax, Nova Scotia, Canada B3H 3A6 (902) 424-6435 Email <c.majka@ns.sympatico.ca> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _. --Apple-Mail-22-619608244 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 <HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; = -khtml-line-break: after-white-space; ">Hi Angus,<DIV><BR><DIV><DIV>On = 1-Sep-06, at 11:29 PM, Angus MacLean wrote:</DIV><BR = class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"> Thanks = for your help. Chris. Following David's lead suggesting it was a = <I>Eristalis, </I>I found this one which identifies it as <I>E. = arbustorum:<BR><BR> </I><A href=3D"http://bugguide.net/node/view/22697" = eudora=3D"autourl"> = http://bugguide.net/node/view/22697</A><BR></BLOCKQUOTE><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><SPAN = class=3D"Apple-style-span">There are 23 species of <I>Eristalis</I> = and=A033 species of <I>Helophilus</I>=A0in North America and (see the = Nomina Nearctica pages at:</SPAN></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><A = href=3D"http://www.nearctica.com/nomina/diptera/dipsyrph.htm">http://www.n= earctica.com/nomina/diptera/dipsyrph.htm</A></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><SPAN = class=3D"Apple-style-span"><I>Eristalis arbustorum</I> Linnaeus 1758 = and=A0<I>Eristalis tenax</I> Linnaeus 1758 are not (insofar as I am = aware) synonymous (Nomina Nearctic list both specific names as = valid).=A0<I>Eristalis arbustorum</I> doesn't occur in Nova Scotia = whereas both=A0<I>Eristalis tenax</I> and=A0<I>Helophilus borealis = </I>are common species here.=A0</SPAN></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><SPAN = class=3D"Apple-style-span">On the basis of the photograph, and examining = specimens of both species, I couldn't tell which it might be. The two = genera are differentiated (from Curran 1965) according to whether the = femorae have patches of setulae on the anterior part of the base, and = whether the third vein of the wing is strongly or only moderately curved = into the apical cell - characters I can't make out from the = photograph.</SPAN></DIV><DIV><SPAN = class=3D"Apple-style-span"></SPAN></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>All the best,</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>Chris</DIV><BR><BLOCKQUOTE = type=3D"cite"><BR> <I>However E._x </I>appears to be the same = creature.<BR> Angus<BR><BR> At 08:45 PM 9/1/2006, you wrote:<BR> = <BLOCKQUOTE type=3D"cite" class=3D"cite" cite=3D"">Hi Angus & = David,<BR><BR> On 30-Aug-06, at 9:04 AM, David & Alison Webster = wrote:<BR><BR> <BLOCKQUOTE type=