LIST OF DIPTERA. 85 



Mediastinal vein ending at about half the length of the wing. 

 Subcostal ending at a little beyond the mediastinal. Kadial ending 

 at rather before two-thirds of the length. First branch of the cubi- 

 tal short, ending at much beyond half the length between the radial 

 and the second branch, which ends at a little in front of the tip of 

 the wing. Four incomplete externo-medial veins. Subanal vein 

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

 lets forming two sides of the hexagonal discal areolet. Median 

 veinlet extremely short. Humeral, subcostal, mediastinal, radial, 

 first cubital, second cubital, praebrachial, pobrachial, anal, axillary, 

 subapical, and discal areolets complete. Four externo-medial areo- 

 lets, axillary lobe, and subaxillary lobe incomplete. Subapical 

 areolet occupying the tip of the wing. 



1. BaSENTIDEMA SYRPHOIDES. 



Foem. Nigra ; antenna basi, thoracis vittce duee, abdominis ma- 

 cules la terales pedesque fulva ; alee su bflavce . 



Basentidema sjrphoides, Macq. Dipt. Exot. i. 1, 197, 1, pi. 24, 

 f. 3. 



Brazil. 



Genus 27. CHRYSOCHLORA. 



Color metallicus. Antenna? 7-articulata3 ; articulus lus elon- 

 gatus ; flagellum attenuatum ; arista elongata setiformis. Abdomen 

 elongatum. 



Sargus, p., Fabr. ; Wied. 



Chrysochlora, Latr. Regne Anim. v. 486 ; Macq. 



Mediastinal vein ending at beyond half the length of the wing. 

 Subcostal and radial veins ending at about two-thirds of the length. 

 First branch of the cubital straight, very short, ending at much be- 

 yond half the length between the radial and the second branch, 

 which is at some distance in front of the tip of the wing. First, 

 second, and fourth externo-medial veins complete; third incom- 

 plete. Subanal vein united to the anal far from the border. Median 

 veinlet short, distinct. Discal areolet hexagonal. 



