128 LIST OF DIPTERA. 



hind shanks and tips of feet brown : wings colourless ; veins pale 

 brown ; brands and poisers tawny. Length of the body 2 — 2\ lines ; 

 of the wings 4 — 4j lines. 



a. Trenton Falls. Presented by E. Doubleday, Esq. 



Xylophagus, Meigen. 



Xylophagus ater, Fabr. Syst. Anil. 64, 1. Latr. Gen. Crust, iv. 

 272, pi. 16. /. 9, 10. Fall. Dipt. Suec. 13, 1. Meig. Dipt. ii. 

 11, 1. Macq. Hist. Nat. Dipt. i. 229, 1, pi. 5, /. 13. Fall. 

 Dipt. Suec. Xyl. 13, 1. Zett. Ins. Lapp. i. 511, 1. Ruthe. 

 Isis. 1831. Loew, Zeit. StetL 1847. viii. 70, 9. Gim. Bull. 

 Soc. Imp. Nat. Mosc. 1847, 1, 176, 1. Blanch. Hist. Nat. Ins. 

 iii. 592. Empis subulata, Panz. Faun. Germ. liv. 23. 



a. England. 



b. France. 



Xylophagus fasciatus, Barnstons MSS., fern. Niger, thorace ci- 

 nereo trivittato, abdomine ferrugineo, basi apice suturisque nigris, 

 pedibus fulvis, alis subfuscis fuscoque vittatis. 



Body black, and clothed with short black hairs : head clothed 

 above with gray down that has a tawny tinge, and adorned with a 

 tuft of bright white hairs on each side at the base of the feelers : 

 mouth pale yellow; palpi black : feelers black, pubescent, not longer 

 than the head: chest with three gray stripes.: abdomen ferruginous, 

 tapering towards the tip, about thrice the length of the chest ; the 

 base, the tip, the sutures and the sides of the segments are black : 

 legs tawny; thighs darker than the hips, but paler than the shanks, 

 which, like the feet, are brownish tawny : wings slightly brown, 

 each having an irregular brown band ; some of the veins clouded 

 with brown ; wing-ribs tawny ; veins piceous ; poisers tawny, their 

 knobs pale yellow. Length of the body 7 lines ; of the wings 9 

 lines. 

 a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 



G. Barnston, Esq. 



Xylophagus americanus? Wied. Dipt. Exot. i. 51, 1. Auss. Zweif. 



i. 84, 1. 

 a. North America. Presented by the Entomological Club. 



Note. — This insect does not quite agree with Wiedemann's 

 description ; and the same observation will apply to the following 

 species. 



Xylophagus triangularis? Say, Journ. Acad. Phil. iii. 1822, 30. 



Wied. Auss. Zweif. i. 85, 2. 

 a. Ohio. Presented by the Entomological Club. 



