492 



This species occurs in the same localities in which forcipatus is 

 found. Nymphs taken at Urbana emerged as early as May 29 and as 

 late as July 17, the species having a considerable range in the period 

 of emergence. There is a possibility that this species has a two- 

 brooded life cycle. 



Specimens have been seen from Urbana, Galena, Lake Villa, Ore- 

 gon, Savanna, and McHenry County. 



Lestes uncatus Kirby 



Nymph. — Color, buff or green. 



Head broad, the caudo-lateral margins not projecting and with- 

 out heavy setae; antennae of the usual Lestes type; mental setae six 

 or seven on each side; lateral seta three, two of which are located on 

 the distal segment ; marginal setae of the mentum extending to the base 

 of the expanded portion of the median lobe ; labium, when folded, ex- 

 tending caudad of the metacoxae. 



Thorax : legs very long and slender, the apices of the femora 

 and the apices of the tibiae and the distal half of the third tarsal seg- 

 ments brown; wing-cases extending to the middle of the fourth ab- 

 dominal segment. 



Abdomen with well-developed lateral keels which are provided v 

 with short spines on the apices of segments 5-9; cuticle uniform in 

 color, the dorsum of segments nine and ten and the venter of segment 

 ten with long, fine, silken hairs ; ovipositor of the female long and ex- 

 tending beyond the apex of the eleventh segment ; gills conspicuously 

 contracted beyond the middle as in rcctangularis and forcipatus, rather 

 sharply pointed at the apex, the point similar to that of unguiculatus. 



Measurements 



Length 18 mm. 



Length of abdomen 11 mm. 



Length of gills 8 mm. 



Width of gills 2 mm. 



to- 1 



Length of median lobe 5.5 mm. 



Width of median lobe -3-1.6 mm. 



Described from a single specimen collected by Dr. Edna Mosher 

 in July, 191 5, at Orono, Maine. 



Adult; Male. — Color, metallic green and pale yellow. 



Head dark green above, pale below; occiput black, the median 

 lobe of the labium pale and subquadrangular with a typical cleft; 



