Descriptions of British Diptera. 455 
triangular spot before the apex, and a streak of the same near the 
base. 
Female : hypostome and forehead greyish-yellow, each of them 
with two shining black glabrous callosities ; antennae and palpi 
black ; the radical joint of the former inclining to fulvous at the 
base ; eyes golden-green, changing with the light, and marked with 
several angular spots of purple ; thorax shining black, clothed with 
reddish-yellow hairs, particularly on the sides, and having two faint 
abbreviated grey lines in front : abdomen with the first segment 
black, having a yellow spot on each side ; second yellow, with two 
diverging black lines in the middle, enclosing a triangular yellow 
spot ; remainder black with yellow hairs : halteres and legs black, 
the basal joint of the hinder tarsi obscure red ; wings brownish- 
black, with a large pale hyaline spot at the base, not reaching the 
anterior margin, and another at the apex. 4 4j lines (Fig. 2.) 
The above description applies to the most ordinary states of this 
fly, but it is one of the kinds which appear in a great variety of as- 
pects. In the state most widely removed from the above, it is of 
small size (3^ lines,) clothed with long pubescence, especially on 
the hypostome and two lower joints of the antennae, and the colour 
entirely black, the pubescence on the belly alone inclining to ferru- 
ginous. Several intermediate varieties occur, connecting these two 
extremes, a circumstance which disinclines us to regard any of them 
as specifically distinct. These varieties are almost exclusively males, 
the characters of the other sex being much more constant. To some 
of them may be referred the insects described under the names of 
Chry. lugubris and viduatus, Fab., C. consimilis, Steph. &c. 
The females of this pretty fly are of occasional occurrence seem- 
ingly in all parts of Britain, and in many parts of England they 
may be regarded as common. The males are comparatively seldom 
met with, and both sexes become scarcer as we advance northwards. 
Of the black variety we have seen only one or two examples, males, 
which were taken in Sutherlandshire and in the south of Scotland. 
C( Cambridgeshire, males rare," Rev. Leonard Jenyns. " Stocton- 
upon -Tees, Cambridge," Charles C. Babington, Esq. " Wittlesea 
Mere, &c. &c." T. C. Dale, Esq. " Dumfries-shire, vicinity of Jar- 
dine Hall, common." Sir William Jardine, Bart. 
CHRYSOPS RELICTUS. 
Chrys. viduatus, Fallen. Meig. Klass. tab. ix. fig. 12. Tabanus caecutiens, 
Panz. Fauna Germ. xiii. 24. Tab. nubilosus, Harris Expos, pi. vii. fig. 5. 
About the size of the preceding species, or somewhat larger : hy- 
postome and forehead yellow, with black spots, as in C. coBcutiens ; 
