ADOPTED FOR THE NORTH AMERICAN TRYPET-SI. 



f A picture on the wings is extant, bat it is never reticulate. 2 



1 < The picture is entirely or partly reticulate, sometimes altogether 



' wanting. 1 15 



( Scutellum with six bristles. 2 I. HEXACH.&TA. 



j 



I Scutellum not with six bristles. 3 



!The third vein conspicuously curved forwards at the tip. 

 II. ACROTOXA. 

 The third vein not curved forwards at the tip. 4 



4 ( The picture of the wings is on the rivulet-pattern. 5 



' The picture of the wings is not on the rivulet- pattern. 8 



- ( Body elongate, abdomen narrower than thorax. VI. STRAUSSIA. 



( Body short, abdomen as broad as thorax. 6 



( Horizontal diameter of the eyes remarkably short. III. STENOPA. 

 ( Horizontal diameter of the eyes not shorter than usual. 7 



_ ( The antepenultimate section of the fourth vein straight. IV. ACIDIA. 

 I The antepenultimate section of the fourth vein curved. V. EPOCHKA. 



( Coloring of the body generally light, never black. 9 



o i 

 ( Coloring of the body black. 13 



f Upon the middle of the wing there are two crossbands converging 



towards the posterior margin. 10 



j No crossbands converging posteriorly upon the middle of the wing. 



I " 



("The third longitudinal vein is gently curved backwards towards the 



end ; head not tumid. VII. SPILOOKAPHA. 



| The third longitudinal vein is straight, up to its tip; head perceptibly 



swollen. VIII. OEDICARENA. 



("Wings with four very oblique crossbands and with very oblique 



approximate crossveins. 12 



j Wings with crossbands which are rather perpendicular or dissolved 



in spots and with very steep crossveins. XL TRYPETA. 



1 Among these species is T. Lichtensteinii, the picture of which cannot 

 well be called reticulate, but rather spottedt 



2 Compare also Epochra. 



(32T) 



