3 ~n^^ 

 no. 



HENOPS MARGINATUS. 



Order Diptera. Fam. Acroceridae Leach. Inflata Lat. 



Type of the Genus Musca gibbosa Linn. 



Henops III., Meig., Fab. Ogcodes Lat.., Leach. Syrphus Fab., 



Panz. Musca Lin7i. 



Antennce nutant, remote, inserted at the bottom of the head just 



above the mouth, 3-jointed, the basal joint large, subglobose, 



2nd long, dilated at the base and apex, that being rigid^ and this 



having a short seta near the extremity (f. 3). 



Cavity of the mouth large. 



Trophi imperfect or none. 

 Head venj smalt, globose, much lotver than the top of the thorax (2). 

 Eyes contiguous, covering the greater portion of the head (2*). 

 Ocelli 3, placed behind the eyes on the crown of th: head (2*). 

 Thorax large, globular (A). Scutellum rounded, distinct (c). Ab- 

 domen very large, globose, inflated, apex dejlexed. Wings longer 

 than the abdomen, nervures very obscure, forming a costal, sub- 

 costal and discoidal cell, apical cells imperfect. Squamulae large, 

 rounded, covering the Halteres, which are clavate. Tibiae simple. 

 Tarsi 5-jointed, basal and terminal joints the most robust and the 

 longest. Claws large, simple. Pulvilli distinct, trilobed (8, afore 



Obs. The dissections are taken from the species figured. 



Marginatus Meig. Syst. Besch. v. 3. p. 100. n. 2. — gibbosus Meig. 

 Klassif 1. 151. 1. 



Black, shining, pubescent. Head black, naked. Thorax having 

 yellowish pubescence, minutely punctured. Scutellum more 

 coarsely punctured. Abdomen minutely punctured, piceous, 

 the margins of the segments dirty while, forming 5 transverse 

 bands j beneath whitish. Wings slightly iridescent ; the ner- 

 vures, especially the costal, yellowish. Halteres ochraceous. 

 Legs dull ferruginous, fuscous towards their base and apex. 



Obs. Specimens are sometimes much less than the size repre- 

 sented by the crossed lines in the plate. 



In the Author's and other Cabinets. 



Within the large cavity of the mouth may be seen a mem- 

 branous flat substance surrounded by an interrupted coriaceous 

 circle, with an appendage arising near the middle : this may 

 probably answer to the lip in other Diptera, but without living 

 specimens it appears to be impossible to arrive at the truth ; 



