305. 

 SARGUS REAUMURI. 



Order Diptera. Fam. Stratiomydae Lat. 



Type of the Genus, Musca polita Linn. 



Sargus Fab., Meig., Lat., Sam. — Musca Linn., Fab. 



Antenna inserted in front of the head, approximating at the base, 

 short, pilose, 4-jointed ; basal and 2nd joints very pilose, the 

 former ovate-truncate, the latter cup-shaped, 3rd joint suborbi- 

 cular, densely clothed with short hairs, 4th forming a long seta, 

 inserted on the upper part of the 3rd joint, producing a few 

 bristles (3). 



Labrum short and hollow, emarginate at the apex (1* b). 

 Mandibles none. 



Maxillce ? not longer than the labrum^ horny, slender and acute 

 (d). Falpi ca^'xtaie. Meig. 

 Tongue none. 



Labium large fleshy and bilobed, concealing the trophi (g). 

 Head hemispherical. Eyes large, covering nearlij the whole head, some- 

 times contiguous in the males. Ocelli 3, sometimes forming an elon- 

 gated triangle in the males (2, the head in profile ; 2* viewed from 

 above). Thorax suhovate, the neck distinct. Scutellum rounded 

 and not spined. Abdomen oblong or spathuliform. Wings hori- 

 zontal and decumbent when at rest, with a scutij'orm areolet near 

 the disc, and an oblique nervure near the apex. Halteres with the 

 club subtrigonaie. Legs slender and simple. Tarsi 5-jointed, basal 

 joint long, 4th the shortest. Claws and Pulvilli distinct (8f, a hind 

 leg). 



Reaumuri Meig. Syst. Besch. v. 3. p. 109. n, 6. 



Female. Shining, pubescent, minutely punctured. Head and 

 antennae blackish, centre of hypostoma green, with 2 white spots 

 at the base of the antennae. Thorax aureous-green, with a white 

 line on each side. Abdomen ferruginous ochre with a lilac tinge, 

 basal joint with a quadrate, 2nd with an elongate-ovate, viola- 

 ceous spot on the back ; the remainder chalybeous, clothed with 

 ochreous pubescence, excepting the margins of the 3rd and 4th 

 joints. Wings iridescent, pale fuscous ; stigma yellowish brown ; 

 nervures piceous. Halteres ochreous. Legs deep ochre, an- 

 terior with the 3 last joints, posterior with a larger portion 

 blackish. 



In the Cabinets of Mr. Heysham, the Author, Sfc. 



The flies contained in this pretty genus are distinguished from 

 their congeners by the elegance of iheir form, as well as by 

 the brilliancy of their colours. The areolet in the centre of 



