192 THE CANADIAN ENTOMOLOGIST. 



gener, but the latter commenced to transform when the period of 

 emergence of the former was almost over. 



The nymphs were taken on July 31, 1913, and emerged on 

 August 7th, 8th and 13th. 



Nymph. — Labium, when closely applied to ventral surface, 

 extending caudad to a little beyond the base, or to the middle, of 

 the hind coxae; mentum narrowest about the middle, the breadth 

 here being about one-third of the apical breadth, widening 

 very slightly proximad ; lateral lobe with inner margin crenulate, 

 the teeth being much less developed than in other species of the 

 genus; the row of teeth between the two hooks of the outer part 

 also less developed than in the other species; 4 or 5 lateral setae, 

 there being 3 or 4 on the movable hook and one before its base. 



Lateral spines present on segments 5-9, those on 5 minute but 

 distinct; spinules on lateral carinae of seg. 9 varying from 9 to 14. 

 Ovipositor extending very slightly beyond the hind margin of seg. 

 10, the styli just reaching the margin. Gills but little tapering 

 distally, being little or no narrower at the distal than at the 

 proximal third, apices convexo-acute. The three dark bands are 

 usually distinct but not sharply defined. The femora have an 

 obscure preapical dark ring. 



Length of body (without gills) 14.75 (contracted in alcohol) 

 -20 mm.; labium(hinge to apex) 3.25-3.5 mm.; outer wing-pad 4.3-5 

 mm.; hind femur 4.7-5 mm.; gill 8.25-9.5 mm. 



Described from four nymphs and three exuviae. 



Lestes eurinus Say. 



Of this species I have only one male exuvia, with the imago 

 and a mounted labium from another specimen, both received from 

 Professor Needham. 



The labium is not very long for the size of the insect as it 

 extends back only to the base of the hind coxae. Mentum very 

 slender in the middle, being only about one-seventh of the greatest 

 breadth ; broadening towards the hinge to about twice this breadth. 

 The mental setae of the mounted specimen are 7 on each side, in 

 the other they are 7 on one side and 8 on the other. There is 

 nothing characteristic about the lateral lobes except that the outer 

 part is rather broad and the teeth between the two hooks are 

 more irregular than in most species. 



