TABLE FOE THE DETERMINATION OP THE GENERA. 11 



TABLE FOR THE DETERMINATION OP THE GENERA. 



1 ( First antennal joint hairy above. 2 



( First antennal joint glabrous above. 16 



2 f Hypopygium disengaged. 3 



I Hypopygium more or less imbedded. 14 



o ( First joint of the hind tarsi bristly. 4 



I First joint of the hind tarsi not bristly. 5 

 Face descending as far as the inferior angle of the eye. 



Gen. I. HYGROCELEUTH0S. 



Face not descending as far as the inferior angle of the eye. 



Gen. II. DOLICHOPUS. 

 , ( Palpi of the male unusually large. Gen. XII. DIOSTRACUS. 



I Palpi of the male small 6 



(The last portion of the fourth longitudinal vein is parallel, or almost 

 so, to the third longitudinal vein. Gen. III. GYMNOPTERNUS. 



I The last portion of the fourth longitudinal vein is distinctly convergent 

 (_ towards the third longitudinal vein. 7 



f The end of the fourth longitudinal vein is abruptly, or at least steeply 

 deflected anteriorly. 8 



8 



The end of the fourth longitudinal vein is only gradually deflected 

 I. anteriorly. 9 



Arista with the usual pubescence ; the end of the fourth longitudinal 

 vein, beyond the angular flexure, runs in a curve. 



Gen. IV. PARACLIUS. 



Arista short-plumose ; the end of the fourth longitudinal vein, beyond 

 the rounded flexure, runs in a straight line. 



Gen. V. PELASTONEURUS. 

 / The face reaches down to the inferior corner of the eye. 

 9 < Gen. VI. TACHTTRECHUS. 



' The face does not reach down to the inferior corner of the eye. 10 

 -.^ ( Proboscis and palpi very much prolonged. Gen. VII. ORTHOCHILE. 

 1 Proboscis and palpi not prolonged. 11 



n ( Scutellum hairy. Gen. VIII. STBISTROMA. 



I Scutellum not hairy 12 



, 2 ( Hypopygium sessile. Gen. IX. HERCOSTOMDS. 



I Hypopygium pedunculated. 13 



, o ( Second antennal joint of usual shape. Gen. X. HYPOPHYLLUS. 



\ Second antennal joint rudimentary. Gen. XI. HALTERICERUS. 



