Entries by Tristram Brelstaff (3025)

Monday
Jul162012

Soldier Fly

Another tiny black soldier fly: this time a female Pachygaster leachii (Diptera: Stratiomyidae).  Distinguished from Pachygaster atra by having all-yellow legs and all-clear wings.

Photo taken in the field below Chazey Wood, near Caversham, UK, on 2012-07-15.

Sunday
Jul152012

Tephritid Flies

A female Tephritid fly with clear wings, probably Terellia serratulae (Diptera: Tephritidae).  Terellia longicauda is similar but has an oviscape that is as long as the adbomen.

This is a male of the same species.  Note the pale blue swellings on either side of the abdomen.  These are pheromone sacs that the males use to attract females (see here).

Photos taken in Whiteknights Park, Reading, UK, on 2012-07-13.

Saturday
Jul142012

Hoverfly

A male hoverfly, probably Riponnensia splendens (Diptera: Syrphidae).  Distinguished from the other metallic-green hoverflies, Orthonevra sp and Lejogaster sp, by the 2 longitudinal whitish stripes on the top of the thorax:

and the white dusting on the face:

Photos taken beside the lower end of the top lake, Whiteknights Park, Reading, UK, on 2012-06-17.

Friday
Jul132012

Soldier Flies

One of several small blackflies which I came across on the underside of leaves of burdock (Arctium sp): a female Pachygaster atra (Diptera: Stratiomyidae).  A female because the eyes are well separated on top of the head:

At first glance they look like beetles that have failed to properly pack away their wings.  This species is characterised by the black basal half of each wing and the femurs being mainly black.  Note also the thick ridges behind the eyes.

Photos taken in the field to the west of Chazey Wood, near Caversham, UK, on 2012-07-08.

Thursday
Jul122012

How to set the Position and Size of Windows in Ubuntu 12.04 LTS

A few web pages that I found useful when writing scripts to set up windows with particular positions and sizes in Ubuntu 12.04 LTS:

Automate opening of nautilus windows? - a thread at Ubuntu Forums

wmctrl examples from Spiral of Hope

wmctrl(1) - Linux Man Page

In the Spiral of Hope page I am not sure what the constructs of the form [#r -r] are meant to do.  Maybe they were part of the option syntax for earlty versions of wmctrl?  Anyhow, the examples seem to work if you replace each occurrence of [#r -r] by just -r (and similarly for the other [#..] constructs).