494 



stripe ; superior anal appendages black at the tips, slightly longer than 

 the inferiors; ovipositor with the lateral valves black on the ventral 

 half, the apex extending well caudad of the tenth segment ; prostyles 

 black at the tip and on the dorsal surfaces, the tips extending beyond 

 the apices of the anal appendages. 



Measurements 



Length, $ 34 mm. 



Length, $ 39 mm. 



Length of abdomen, $ 26-28 mm. 



Length of abdomen, $ 29 mm. 



Length of hind wings, $ 21 mm. 



Length of hind wings, $ 23 mm. 



Width of hind wings, $ 4.5 mm. 



Width of hind wings, $ 4.5 mm. 



A moderately common species though not as common as either 

 rectangularis or forcipatus. Taken at Oregon July I, 191 5, at Free- 

 port July 8, and at Urbana. 



Lestes unguiculatus Hagen 



Nymph. — Color, light brown or green. 



Head about twice as broad as long, subelliptical, the caudo-lateral 

 angles not projecting, and provided with a few weak setae; antennae 

 slender, entirely pale, the third segment longest, segment two longer 

 than one; labium slender, and extending caudad of the mesocoxae; 

 mental setae seven, lateral setae three, two of which are located on the 

 distal segment of the palpus; lateral marginal setae of the mentum 

 about twelve, the row extending from the articulation of the palpus to 

 the base of the expanded portion. 



Thorax slender, much contracted behind the head, about as broad 

 as long; legs slender, the femora with rows of short setae and faint 

 preapical rings of brown ; tibiae with rows of setae, the apices brown ; 

 tarsi pale except the apical half of the third segment which is brown; 

 metathoracic wing-cases extending caudad to the middle of the third 

 abdominal segment. 



Abdomen long and slender, the lateral keels moderately well de- 

 veloped and possessing spines at the apices of segments 5-9; venter 

 of the abdomen usually much paler than the dorsum though sometimes 

 with faint median stripe and stripes just ventrad of the lateral keels ; 

 caudo-lateral angles of terga 1-8 sometimes with darker spots; gills 



