)L- mi 



737. 

 BACCHA ELONGATA. 



Order Diptera. Fam. Syrphidae. 



Type of the Genus, Syrphus elongatus Fab. 

 Baccha Fab., Meig., Macq., Curt. — Syrphus Fab. 



Antennce small, porrected, approximating at the base ; inserted 

 under a slight prominence in the middle of the face, 5-jointed, 

 basal jointsomewhat cup-shaped, 2nd broader, more bowl-shaped 

 with strong bristles round the margin, 3rd the largest, pubescent, 

 compressed, subovate or orbicular, the base emarginated, ob- 

 liquely, 4th a minute joint inserted on the back of the 3rd near 

 the base, 5th a rather short seta thickened and slightly pubes- 

 cent externally at the base (3). 



Trophi short and received into an oval cavity under the face. 

 Labrum large, broad, the apex bilobed with a spine in the cen- 

 tre, and a smaller one on each side {\ b). 

 Tongue longer stout horny and lanceolate (c). 

 Maxilla short, slender, slightly curved and acute (e). Palpi 

 longer, membranous, strap-shaped, slightly pubescent {f). 

 Lip rather short, stout, bilobed and hairy {g). 

 Head somewhat small, hemispherical, face globose, with a short con- 

 cave space under ihe antennce , formed by a shining tubercle on the 

 clypeus (2 the profile, 2* underside) : eyes large, not very remote in 

 the females, contiguous in the males : ocelli minute, 3 in triangle on 

 the crown. Th.ora.x small and oval : scutel semiovate. Abdomen 

 6-jointed, elongated, clavate, very narrow at the base, the back 

 slightly arched. Wings parallel and incumbent in repose, as long 

 as the body and ample, the transverse nervures approximating on the 

 disc, with a false longitudinal nervure passing through them : hal- 

 teres capitate. Legs short and slender, hinder the longest : thighs 

 and tibiae very slender and simple : tarsi 5-jointed, basal joint the 

 longest and slightly incrassated in the hinder pair (Sf), Ind oblong, 

 the following turbinate, the 4th being the shortest: claws and pul- 

 villi minute. 



Elongata Fab. — Curt. Guide, Gen. 1228. 1. 



Shining brassy-black, sparingly punctured and delicately pu- 

 bescent : eyes and antennae reddish-brown ; head bluish-green, 

 the face with grayish pubescence, tubercle black : thorax with 

 a i)alish spot on each shoulder : scutel and base of abdomen 

 chalybeous, base of 3rd and 4th segments with an ochreous 

 band formed of 2 large spots, 5th with a small spot on each 

 side : wings very iridescent, the base ochreous, costa towards 

 the apex and the posterior margin suffused with brown, the 

 stigmatic spot and sometimes the transverse nervures brown : 

 halteres and legs ochreous, the hinder tarsi slightly dusky. 



In the Author's and other Cabinets. 



