53 
Genus 
CHRYSOPS, Meigen. 
Chrysops caecutiens, Linn. 
Plate 26. 
The figures in the plate illustrate the striking sexual difference in 
the coloration and marking of the abdomen, which, though also seen 
in the case of Chrysops quadrata and relicta, is much more pronounced 
in the present species. It should be noted, however, that on the 
ventral surface of the abdomen of the male C. ccecutiens there is a 
yellow patch on each side, which frequently extends on to the upper 
surface and forms a more or less conspicuous ochraceous fleck on each 
side of the second segment. , In life the eyes of this as of the 
other species of the genus are extremely beautiful, even when com- 
pared with those of other Tabanida;, which as a family arc distin- 
guished for the beauty of their eyes ; the ground-colour is golden or, 
reddish-green, and is marked with purple spots and lines. 
Chrysops ccecutiens has been taken by Colonel Yerbury at Torcross 
S. Devon, as early as May 24th, and the Museum series of specimens 
shows that it is on the wing at any rate until the end of the first week 
in August. The dates and localities of the specimens are as follows : — 
Nairn, N.B., July 17th, 1904 {Lieut.-Colonel Yerbury) ; Ounclle, North- 
ants, July 1 6th, 1905 {Hon. N. C. Rothschild) ; Rugby, Warwickshire, 
July 3rd, 1890, July 10th, 1892 {E.E.Austen); Felden, Boxmoor, 
Herts, July 24th, 1893 (A- Piffard) ; Bearsted, Kent, July 10th, 1896 
{E. E. Green) ; Fawkham, Kent, July 7th, 1895 {IV. E. de Winton) ; 
Tilgate Forest, Sussex, August 3rd, 1890 {E. E. Austen); Woolmer 
Forest, Plants, August 7th, 1892 ( W. R. Ogilvie Grant) ; Lyndhurst and 
Lyndhurst Road, New Forest, Hants, June 25th to July 12th, 1894 
{Lieut.-Colonel Yerbury) ; various localities in S. Devon, May 24th to 
July 28th {Lieut.-Colojui Yerbury) ; Porthcawl, Glamorganshire, S. 
Wales, June 17th and 1 8th, 1903 {Lieut.-Colonel Yerbury). 
