32 DRAGONFLIES OF OHIO. 



broad stripe of black abdominal rings 3-9 with more 

 or less black apically above, 10 reddish. All colors 

 paler. 



The posterior border of ten in the male has a deep 

 round sinus; the appendages are about equal to 10, 

 the lower longer than the superior; the superior has 

 the upper branch prismatic, short, ending within in a 

 stout denticle; the lower branch is finger-like in profile, 

 turned down, obtuse, from above the two are lyre- 

 shaped. The inferiors have a thick base and taper to 

 an obtuse angle, sides straight. Both are rufous. The 

 female appendages are short cones, rufous, the valves 

 narrow, pointed, the processes short and rufous. 



It is not unusual to find examples of females much 

 larger than the average given above. 



ENALLAGMA, Charpentier. 



This genus comprehends moderate sized species of 

 singularly varied and beautiful colors and our fauna is 

 comparatively rich since thirteen species have already 

 been captured within the state. They appear to take 

 the place occupied by Agrions in Europe. Several 

 of these charming and abundant forms appear early in 

 the season, and representatives of the genus are abroad 

 until late in September. 



The species may be arranged in two groups or 

 divisions on obvious characters, as follow^s; 



1. Males with an apical spot* on the dorsum of 

 the second abdominal ring; female with the dorsal 

 band the entire length of 2. 



2. Dorsum of 2, in both sexes, with a band ; in 

 the female 10 is blue or green. 



*Individiials in certain species of tliis division have this spot covering 

 much of or the whole of the dorsum of 2, but anteriorly it is always narrow 



