390 THE CANADIAN ENTOMOLOGIST. 



small, PD being on all the segments 

 less than .5 mm. long; ovipositor 3.5 

 mm.; tips of genital valves 

 elevated 5. umbrosa^ n. sp. 



GG. Abdomen not more than 38 mm. long ; first lateral 

 thoracic band narrow, sigmoid, or bent by alternate 

 angles ; a heavy black line on the fronto-nasal 

 suture. 



P. Distance from posterior margin of occiput to 

 frontal vesicle at least 2.5 mm.; appendages 

 slightly longer than the dorsa of segs. 9+10, 

 a little more than i mm. broad, tapering 

 equally at base and apex, the latter distinctly 

 though bluntly pointed. 18. sitchensis Hagen. 



PP. Distance from posterior margin of occiput to 

 frontal vesicle about 1.5 mm.; appendages 

 about as long as segs. 9 + 10 ; more slender 

 proximally than distally, the apices rounded 

 or broadly and obscurely 

 pointed 19. septefitrionalis Hagen. 



DD. Basal plate of ovipositor distinctly bilobed (pi. X, fig. 5) ; PL 

 separate from PD (sometimes narrowly connected on seg. 2), 

 as large as the latter on segs. 2-5 ; a black line always present 

 on the fronto-nasal suture ; lateral thoracic bands yellow or 

 greenish-yellow. 



Q. Appendages distinctly shorter than segs. 8 + 9 (5 mm. or 

 less) ; margins of lateral thoracic bands nearly straight, 

 first band gradually tapering to the upper end, without 

 a distinct posterior spur 16. jiincea L. 



QQ. Appendages about as long as segs. 8 + 9 (6-6.5 mm.) ; 

 lateral thoracic bands v^rith their anterior margins obtus- 

 angularly excavated, but not sinuate, posterior margins 

 nearly straight ; first band gently widening above the 

 middle to the upper end, from which a narrow posterior 



spur is given off 17. subarctica, n. sp. 



Unknown 10. nevadensis, n. sp. 



