544 



Thorax with the brown of the mesopleural dark stripe covering 

 the suture more conspicuous and persistent than it is in the male; 

 mesostigmal plates as shown in Figure 220. 



Abdomen with broad dorsal stripes on segments 1-8, the stripe 

 on nine being reduced to two triangular spots at the base of the tergum, 

 the remainder being blue in color ; tergum ten blue ; lateral surfaces of 

 terga 2-8 and narrow interrupted basal rings on segments 3-8 pale 

 green ; sterna 2-8 with black mesal lines, the eighth with a long apical 

 seta; ovipositor and anal appendages of the usual form, the lateral 

 valves of the ovipositor blue or pale and serrate on the ventral margins ; 

 prostyles dark brown. 



Measurements 



Length, $ 35 mm. 



Length, 9 32 mm. 



Length of abdomen, $ 29 mm. 



Length of abdomen, 9 26 mm. 



Length of hind wings, S 19 mm. 



Length of hind wings, 9 20 mm. 



Width of hind wings, $ 4 mm. 



Width of hind wings, 9 5 mm. 



One of the most common and wide-spread species of the state. 

 The nymphs prefer meadow brooks, but also inhabit small lakes and 

 ponds. In numbers this species is equal to signatum. The adults 

 emerge early and fly throughout the summer. 



Specimens have been seen from Dubois, Carbondale, Carmi, 

 Golconda, Lake Villa, Oregon, and Cook County. 



Enau,agma geminatum Kellicott 



Nymph. — Color, usually green. 



Head about three times as broad as long, elliptical, the caudo- 

 lateral angles not projecting caudad or laterad, evenly rounded, and 

 possessing only a few setae; third segment of the antennae longest 

 and the second segment decidedly longer than the first ; segments 1-3 or 

 1—4, dark in color ; labium extending slightly caudad of the procoxae ; 

 median lobe with three mental setae and sometimes a minute fourth ; 

 lateral setae five; median process of the labial palpi with only two 

 teeth; lateral margins of the median lobe with three or four small 

 setae caudad of the articulations of the labial palpi. 



Thorax : legs without dark rings near the apex or with very faint 

 ones, the femora provided with rather long setae ; tarsal claws dark at 



