

268 LIST OF DIPTEKA. 



2. AcANTHOCERA MARGINALIS. 



Foe ra. Picea ; antenna cornutce, basi testacem, thoracis longitu- 

 dine ; thorax vittis duabus dorsalibus maculisque duabus late- 

 ralibus scutelloque aurato-flavis ; abdominis segmenta \um et 

 2um aurato-flavo marginata ; pedes picei, tibiis tarsisque basi 

 albis ; ala limpida, vitta costali strigaque postica fuscis. 



Fern. Piceous. Head with a triangular callus in front, and a 

 larger and nearly round one beneath the antennae. Antennae as 

 long as the thorax, testaceous at the base ; third joint with a rather 

 long horn; the following joints of nearly equal length, shorter than 

 the third. Thorax with two slender parallel gilded yellow dorsal 

 stripes, and with a gilded yellow spot on each side. Scutellum 

 gilded yellow. First, second and third abdominal segments with 

 gilded yellow hind borders. Legs piceous ; tibiae and tarsi white 

 towards the base; middle tibiae wholly white. Wings limpid, 

 brown along the fore border, and with a brown streak between the 

 subanal and anal veins towards their tips ; first branch of the cubi- 

 tal vein simple, forming a sharply defined slightly obtuse angle 

 near the base ; subanal vein joining the anal close to the border. 

 Length of the body 4 lines ; of the wings 8 lines. 



a. Para. From Mr. Bates' collection. 



Genus 9. DIABASIS. 



Frons fcem. sat angusta. Facies convexa. Ocelli nulli. Pro- 

 boscis brevis. Palpi fcem. subulati. Antennae mediocres, incum- 

 bentes, 7-articulatae, oculis inferius insertae, articulo 3o simplici. 

 Tibiae anticae saepissime arcuatae. 



Diabasis, Macq. Hist. Nat. Dipt. i. ; Dipt, Exot. i. 1, 150. 

 Tabanus, p., Fabr. ; Wied. 



Mediastinal vein ending at before two-thirds of the length of 

 the wing. Subcostal ending before three-fourths of the length. 

 Radial ending at half the distance between the subcostal and the 

 tip of the wing. First branch of the cubital simple, forming an ob- 

 tuse and rounded angle near the base, slightly curved towards the 

 tip. Second branch ending on the hind border far from the tip of 

 the wing. Four complete separate externo-medial veins. Subanal 

 vein united to the anal at some distance from the border. Discal 

 areolet elongated, narrow, hexagonal ; sides slightly convex. 



