ANALYTICAL TABLE OF THE SMALLER GENERA, 



ADOPTED FOR THE NORTH AMERICAN TRYPET^. 



r A picture on the wings is extant, but 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. 



1 Scutellum not with six bristles. 3 



/ The third vein conspicuously curved forwards at the tip. 

 3< II. Acrotoxa. 



I. 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. 



I Body short, abdomen as broad as thorax. 6 



r. ( Horizontal diameter of the eyes remarkably short. III. Stenopa. 



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



7 ( The antepenultimate section of the fourth vein straight. IV. Acidia. 



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

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



1 Coloring of the body black. 13 



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



I towards the posterior margin. 10 



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



i » 



f The third longitudinal vein is gently curved backwards towards the 

 I end ; head not tumid. VII. Spilogkapha. 



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



swollen. VIII. Oedicarena. 



f Wings with four very oblique crossbands and with very oblique 

 I approximate crossveins. 12 



j Wings with crossbands which are rather perpendicular or dissolved 



in spots and with very steep crossveins. XI. Trypeta. 



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

 well be called reticulate, but rather spotted. 



2 Compare also Epochra. 



( 32Y ) 



