1 50 Descriptions of British Diptera. 
first always, and the second sometimes, interrupted: in other respects 
corresponding to S. chamceleon. 
Occurs at times along with the preceding species, and is said to 
have been taken in the vicinity of London. " Monks Wood, Hunts." 
Charles C. Baking ton, Esq. 
3. STRATIOMYS FURCATA. 
Stratiomys furcata, Fdbr. Meig. Stephens Stratiomys panthaleon, Fallen. 
Musca singularius, Harris, Expos, pi. xi. fig. 2. 
Head and antennae black, the former with light grey pubescence, 
two narrow yellow streaks over the insertion of the antennae, and 
two marks of the same colour on the crown : thorax pitch-brown, 
pretty thickly clothed with greyish hairs ; the scutellum, together 
with its two spines, yellow, and having a triangular black mark at 
the base : abdomen slightly clothed with short pubescence similar to 
that on the thorax, the ground colour black, the sides with several 
straw-coloured spots ; viz. a pretty large triangular one on each side 
of the second segment extending a little way over the anterior edge 
of the third segment ; two sublinear marks on the latter emitting an 
obtuse salient point at the inner end directed forwards, and likewise 
extending across the incisure behind ; two elongate ones on the 
fourth segment, and the usual triangular mark at the extremity : 
underside of the abdomen black, with four irregular straw-coloured 
fasciae, narrowed on each side to a point and not reaching the margin ; 
thighs dark-brown, the tarsi and greater part of the tibiae pale yel- 
low : wings tinged with ferruginous anteriorly. (See Fig. 4tk of the 
last wood-cut.) 7-8 lines. 
Scarce ; has been taken near London, and in a few other places. 
" In ponds, Holywood, on Belfast Lough, County Down : at Kil- 
larney." A. H. Holiday, Esq. 
4. STRATIOMYS RIPARIA.* ( s.J 
Meig. Zwei. iii. 138. 
Head of the male black, in the other sex marked like that of the 
female of S. furcata, in both clothed with long whitish pubescence : 
thorax thickly covered with reddish-yellow hairs, the surface pitchy 
brown ; scutellum and spines yellow, the former more or less mark- 
ed with black at the base : hinder margin of the second, third, and 
fourth segments of the abdomen with a white or yellowish stripe on 
both sides, the anal one with a triangle of the same colour; the rest 
of the surface black ; under side with three white bands not reaching 
to the edge, and the anus margined with the same colour : legs pale, 
the thighs and hinder portion of the tibiae brown ; the wings brown 
slightly tinged with yellow, and having dark nervures. 6 lines. 
