380 THE CANADIAN ENTOAIOLOGIST. 



EE. No black line on the fronto-nasal suture ; dorsal 

 thoracic bands rapidly widening caudad so as 

 to be triangular in form with the base just in 

 front of the antealar sinus ; generally two cells 

 between A^, at its origin, and the anal triangle. 



F. Face rather dark olivaceous ; lateral 

 thoracic bands rather narrow (about 

 I mm.), straight, not widening above, 

 nearly surrounded by a margin darker 

 than the ground colour of the thorax; 

 abdominal spots mostly smaller than 

 usual, more or less greenish, PD on 

 seg. 9 less than one-third as long as 

 the dorsum of the segment ; a pair 

 of large pale bluish basal spots on the 

 ventral surface of segs. 4, 5 and 6 ; 

 lateral carina of segs. 7 and 8 in 

 ventral view strongly sinuate in its 

 anterior two-fifths . . 5. umbrosa, n. sp. 



FF. Face pale greenish-yellow ; lateral 

 thoracic bands broader, not sur- 

 rounded by a dark margin, widening 

 above the middle margins of the first 

 band, especially the anterior, dis- 

 tinctly sinuate ; spots of the abdomen 

 well developed, mostly blue, PD 

 on seg. 9 more than one-half as long 

 as the dorsum of the segment ; 

 ventral surface of abdomen without 

 pale spots ; lateral carina of seg. 7 

 at most very feebly sinuate in ventral 

 view 6. constricta Say. 



AA. Anal triangle 2-celled ; spine of the anterior lamina directed ventrad. 



G. Hamular process continuous with hamular fold (PI. X, fig. 3), 

 spine of the anterior lamina short and blunt, projecting very 

 little, if at all, below the general level of the ventral 

 surface {clepsydra group). 



