152 Descriptions of British Diptera. 



species are sufficiently dissimilar to be entitled to a distinctive name. 

 The larvae, one of which is figured and described by De Geer, are 

 aquatic, and seem in no respects to differ from those of Stratiomys- 



1. Odontomyia argentata. 



Stratiomys argentata, Fabr. Meig. Zwei. iii. 141 — Panzer, Fauna Germ. 

 lxxi. fig. 20 <J, cviii. fig. 10 $ — Odontomyia argentata, Latr. 



Head and antennas black, eyes greenish with a purple fascia, the 

 forehead clothed with shining silvery hairs ; thorax and scutellum 

 dark-brown, with brownish-yellow pile, the scutellar spines small 

 and inconspicuous ; abdomen black, clothed throughout with silvery 

 hairs, having a bluish tint, with an acute triangular yellow spot on 

 each side of the second and third segment, and the anus likewise 

 of that colour ; under side black slightly tinged with green : 

 wings vitreous, the nervures and a small spot near the middle of the 

 costa brown ; legs of the latter colour, the tibiae ferruginous, with a 

 brown mark near the middle. 



The female differs chiefly in having the body of a deeper black 

 and clothed throughout, except on the sides of the abdomen, with 

 pile of a golden-green colour. 4^ lines. 



Rare ; has been found in the vicinity of London, and indigenous 

 specimens are preserved in the British Museum, and likewise in the 

 cabinet of the Rev. Mr Kirby, now in the possession of the Ento- 

 mological Society of London. " Cambridge, 1832." — Charles C. 

 Babington, Esq. 



2. Odontomyia ornata. ( s ) 



Odon. furcata, Meig. Klassif. i. 129, pi. vii. fig. 22. Latr. Gen. Crust, iv. 

 Reaumur, iv. pi. 24, fig. 4-7 ? 



Eyes green and unspotted ; antennae and hypostome dark brown, 

 the latter with yellowish hairs ; thorax and scutellum dark brown, 

 clothed with rufescent hairs, the scutellum margined with reddish- 

 yellow, and the spines likewise of that colour, with the tip black ; 

 abdomen black above, and somewhat glossy ; with fulvous triangular 

 spots on the sides, and the anal segment edged with fulvous ; the 

 under side pale, having a pair of dusky spots on the third and fourth 

 segments ; legs ferruginous, the basal half of the thighs black, and 

 the tibiae and tarsi more or less spotted with brown ; wings transpa- 

 rent, the nervures yellowish. — In the female the legs are entirely 

 ferruginous, and the forehead of the same colour, with a black line 

 in the middle, and a spot on each side. 6-7 lines. 



In spring and summer, occasional. Occurs in Roxburghshire and 

 near Edinburgh. " Near London," Stephens's Calal. " Dalmeny," 

 Rev. William Little. 



