I Q - /-^ 33 

 452. 

 VOLUCELLA INFLATA. 



Order Diptera. Fam. Syrphidae. 



Type of the Genus, Musca pellucens, Linn. 



VoLUCELLA Geoff. ,Meig., Lat., Curt. — Syrphus Fah., Pans. — Ptero- 

 cera Meig. — Musca Linn. 



Antenna; nutant, inserted in a cavity on the forehead, contiguous 

 at the base, plumose, 4-jointed, basal joint slightly cup-shaped, 

 2nd broader, but short, truncated somewhat obliquely, fringed 

 with strong bristles, 3rd large fleshy, reniform, compressed, 4th 

 a long seta, attached close to the base of the 3rd on the upper 

 margin, cUiated on both sides with fine hairs, very long on the 

 upper side (3). 



Labrum hollow, externally convex and notched at the apex (1 b.) 

 Tongue nearly as long as the labrum, narrow, acute (c). 

 MaxillcB shorter than the tongue, shghtly curv^ed, narrowed and 

 rounded at the apex {e). 



Palpi short narrow and rounded, membranous at the apex, with 

 a few hairs on the side (/). 



Labium twice as long as the labrum, membranous at the base, 

 homy at the middle, terminated by 2 elongated lobes, slightly 

 hairy and striated transversely {g). 

 Trophi elongated and exserted. Head trigonate in front, the loioer 

 portion sometimes forming a conical beak notched at the apex (2, the 

 head in profile). Eyes contiguous in the males and pubescent, some- 

 times naked in the females in ivhich sex they are remote (29). Ocelli 

 3 in triangle. Thorax subquadrate : scutellum large transverse semi- 

 ovate. Abdomen, broad, convex and subovate. Wings (9) divari- 

 cating, the 4th longitudinal nervure not lobed. Halteres small and 

 capitate. Tibiae, posterior slightly crooked at the middle. Tarsi 

 5-jointed, basal joint the longest and sometimes thicketied in the pos- 

 terior pair, 4th joint crescent-shaped, 5th small. Claws small. 

 Pulvilli bilobed. 



Inflata Fab. — Meig. — Curt. Guide, Gen. 1247. 4, 



Piceous shining and pubescent : head beaked and ochreous, 

 antennae pale fen'uginous : sides of thorax and sometimes a spot 

 behind, as well as the scutellum pale ferruginous : abdomen 

 black, with the 2nd segment ochreous, excepting a narrow 

 space at the base which is continued down the back, and very 

 narrow in the female : wings transparent, yellow at the base 

 and costa ; nervures brown, a sinuated spot at the middle and 

 the nervures of the apex suffused with the same colour : halteres 

 ochreous : tips of thighs, base of tibiae and tarsi ferruginous. 



In the Author s and other Cabinets. 



This beautiful genus is distinguished from a considerable por- 

 tion of the Syrphidas by the longitudinal nervure that extends 



