[Syrphidae] Re: ID

[Jeroen van Steenis]

Dear Francis and Kevin

It is a female of Brachypalpus based on the angle of vein M1 with vein R4+5
(perpendicular here, and slightly to strongly oblique in C. pachymera and
C. asilica respectively), the anterior outline of the frons (trapezoid here
and with projecting lunulae in Criorhina).

Furthermore there seems to be no pollinosity on the scutum (dark-orange in
C. asilica). Pilosity on thorax and abdomen seems nearly evenly long (in C.
asilica clearly shorter on abdomen). Tergite I and II seem entirely black
(in C. asilica and C pachymera pollinose to yellow coloured).

So based on this it is Brachypalpus of which there are 3 or 4 options.
B chrysites is much more orange yellow pilose on tergites II-V, and frons
only narrowly pollinose along eye margin
B. laphriformis most often has yellow colour on tergite I and lateral sides
of tergite II and abdominal pile slightly shorter than on thorax.

conclusion it seems B. valgus, or option 4 an undescribed species.

ps I do not know Brachypalpus zugmayeriae, but this is a Caucasian species
so not very likely to occur in Algeria.

Best wishes,

Jeroen.

2016-12-17 0:38 GMT+01:00 Kevin <kevinmoran88 at comcast.net>:

> It's definitely a *Criorhina*. Based on the gestalt and enlarged leg it
> is either *Criorhina asilica* or *Criorhina pachymera. *I believe it is
> the latter.
>
> Best,
> Kevin
>
> ------------------------------
> *From: *"Francis Gilbert" <Francis.Gilbert at nottingham.ac.uk>
> *To: *syrphidae at nottingham.ac.uk
> *Sent: *Friday, December 16, 2016 2:40:33 PM
> *Subject: *[Syrphidae] ID
>
>
> hi everyone
>
>
>
> Boudjema Samraoui in Algeria is putting together some checklists of the
> syrphids there, and has a photo (attached) of a difficult damaged specimen
> that he has tentatively identified as a Criorhina. Has anyone anything to
> say about this?
>
>
>
> Thanks
>
>
>
> Francis
>
>
>
>
>
> Dr Francis Gilbert
>
> Professor of Ecology, School of Life Sciences
>
> University Park, University of Nottingham, Nottingham NG7 2RD, UK
>
> Tel: +44 (0) 115 951 3215 <+44%20115%20951%203215>
>
> website: www.nottingham.ac.uk/~plzfg
>
>                 ecology.nottingham.ac.uk
>
>
>
>
>
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