194 THE CANADIAN ENTOMOLOGIST. 



Lateral spines on abdominal segments 4-9, small but distinct 

 on 4, increasing to 7, smaller again on 9. Gills tapering but little 

 distally, the width at the distal third little less than at the proxi- 

 mal third, apices broadly convexo-acute. 



Length of body (without gills) 25 mm.; labium 5.5 mm.; 

 outer wing-pad 6.5 mm.; hind femur 6.0 mm.; gill 11 mm. 



Lestes unguiculatus Hagen. 



All that I have to represent the nymph of this species is the 

 slide received from Professor Needham, on which the mouth-parts 

 are mounted. The labium is of about the minimum size for L. 

 unc tus, measuring barely over 4 mm. in length from hinge to 

 apical margin of mentum. The mentum is of the same form and 

 bears 7 mental setae en the right side and 5 on the left, though 

 there is a space on the left side that appears to have borne two 

 others. 



The lateral lobes have apparently no special characteristics 

 but their exact form cannot be determined as they do not lie flatly 

 on the slide. 



Although nothing is known of the ovipositor of the nymph of 

 this species, it is safe to infer that it is of about the same size as 

 in disjunctus or rectangularis, as this relation obtains in the adults 

 of these species. 



Lestes uncatus Hagen. 



On June 26, 1913, I found the adults of this species in enor- 

 mous numbers about a prairie pond or "slough" at Prince Albert, 

 Saskatchewan. The exuviae were also numerous here and one 

 nymph was taken when about to transform. I also have a con- 

 siderable number of full-grown nymphs taken by Mr. R. P. 

 Wodehouse from a pond on Fitzwilliam Island, Georgian Bay, 

 Ont., June 29th, 1912, where they were taken in company with 

 nymphs of L. rectangularis. In addition to these I have a slide 

 from Professor Needham, on which the mouth-parts are mounted. 



It is a somewhat larger and slightly stouter nymph than that 

 of L. rectangularis and the labium is noticeably larger. The 

 females are easily recognized by the very large ovipositor, a char- 

 acter that is also present in the adults. This feature is probably 

 shared by L. forcipatus (q.v.). 



