LIST OF DIPTERA. 273 



First branch of the cubital forked and obtusely angular near the 

 base, slightly curved from thence to the tip ; second branch nearly 

 straight, ending on the hind border far from the tip of the wing. 

 Four complete separate externo-medial veins. Subanal vein united 

 to the anal near the border. Discal areolet oblong, hexagonal, 

 somewhat broad ; hind basal side rather long. 



1. Selasoma tibiale. 



Chalybeo-violaceus ; tibice inerassatcs ; alee fusco-nigrce, apice 

 limpidce. 



Tabanus tibialis, Fabr. Syst. Anil. 102, 39. Wied. Dipt. Exot. i. 



89, 47 ; Auss. Zweifl. i. 164, 82. 

 Selasoma tibiale, Macq. Dipt. Exot. i. 2, 188. 

 Var. Hadrus cyaneus, Cat. of Diptera, Pt. 1, 208. 

 Hadrus chalybeus, Perty, Del. Anim. Art. Bras. 



2. Selasoma cyaneum. 

 Chalybeus ; alee limpidissimce. 

 Tabanus cyaneus, Wied. Auss. Zweifl. i. 152, 65. 



Genus 12. SILVIUS. 



Corpus oblougum, pubesceus. Ocelli tres. Proboscis brevis. 

 Antennae 7-articulatae, sat parvae ; articulus 3 us angulatus, non fur- 

 catus. Abdomen longi-obconicum. Pedes sat gracilis. 



Silvius, Meig. Zweifl. ii. Wied. ; Macq. 

 Tabanus, p., Fabr. 



Mediastinal vein ending at much before two-thirds of the 

 length of the winu:. Subcostal ending at a little before three-fourths 

 of the length. Radial ending much nearer to the tip of the wing 

 than to the subcostal. First branch of the cubital simple, slightly 

 curved, with a very obtuse and rounded angle near its base ; second 

 branch ending on the hind border far from the tip of the wing. 

 Four complete separate externo-medial veins. Subanal vein united 

 to the anal at some little distance from the border. Discal areolet 

 elongated, hexagonal. 



