156 Descriptions of British Diptcra. 
1 j) thorax and abdomen oval, the latter somewhat convex ; scutellum 
with two posterior spines : eyes slightly pubescent in the males. 
This genus approximates pretty closely to Clitellaria, but is suf- 
ficiently distinct. The species, which are not numerous, are all of 
small -size, some of those found on the continent being even very 
minute : and they are prettily coloured, with the abdomen general- 
ly fasciated or spotted at the sides with yellow. They frequent 
flowers and foliage, usually in the vicinity of ponds and other col- 
lections of water. The larvae seem to be unknown. 
1. OXYCERA PULCHELLA. 
Meig. Zwei. iii. 125, pi. 25, fig. 29, $. Musca hypoleon, Donovan, v. 
pi. 146. fig. 2 Musca tardigradus, Harris, Expos, pi. xi. fig. 6. 
Head and antennae black, the forehead with two silvery pubes- 
cent spots in the male, yellow in the female, with a black line in 
the middle ; the hypostome and space behind the eyes likewise yel- 
low in the latter sex ; eyes with a purple band : thorax black, mar- 
gined on the sides with yellow from the front to a little behind the 
base of the wing, beyond this a triangular yellow spot on each side 
of the scutellum ; the latter yellow, the spines tipped with black ; 
abdomen black, with a pretty large oblique yellow spot on each side 
of the third and fourth segments, and a triangular one at the extre- 
mity ; in addition to these, the female has a yellow mark on the first 
segment, just below the scutellum; under side of the abdomen black, 
the second, third, and fourth segments more or less yellow in the 
middle ; legs yellow, upper half of the thighs black, and the termi- 
nal joints of the tarsi likewise of that colour. About 3 lines in 
length. (Preceding wood-cut, Jig. 2.) 
Battersea Fields and other places in the vicinity of London. 
" Near Portland, on 24th June 1831." /. C. Dale, Esq. 
2. OXYCERA TRILINEATA. 
Stratiomys trilirieata, Fabr. Musca trilineata, Linn. ; Donovan, v. pi. 151. 
fig. 5 Musca Hydroleon, Harris, Expos, pi. xi. fig. 4. 
Nearly of the same size as the preceding, the prevailing hue green, 
or yellowish-green, the one colour sometimes predominating and 
sometimes the other ; antennae yellow, the forehead of the female 
with three black streaks, the lateral ones abbreviated ; thorax with 
three black longitudinal lines approximating, sometimes confluent, 
at both ends ; scutellum with its spines of the same colour as the 
body ; abdomen with irregular transverse black bands on the back, 
not reaching the margin, and frequently having the ends turned for- 
wards so as to give them a crescent shape ; legs and halteres yellow ; 
wings vitreous. 
