150 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. Babington, Esq. 



3. Stratiomys furcata. 



Stratiomys furcata, Fabr. 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 extremitv : 

 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. 4th 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. Haliday, Esq. 



4 Stratiomys riparia. (s.) 

 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. 



