37 



abundant in Ohio in late summer ; his notes on their habits are 

 worth repeating here, as they tend to confirm the preceding 

 statements of the habits of the nymph. " It prefers seclusion, 

 hence should be looked for along ponds and streams with well- 

 wooded banks, where branches overhang the water, and where 

 half-submerged logs and rubbish abound. The males may be 

 seen from early in the forenoon until dark, on warm days, ex" 

 ploring every corner among the obstructions at the water's edge. 

 An interesting habit noted was that it would often fly out and 

 carefully examine a passing skiff. The females, when not ovipos- . 

 iting, are suspended from some overhanging twig." Van Duzee 

 ('97) makes a similar observation. The imago is widely dis- 

 tributed, being reported from Canada and the eastern United 

 States as far south as the Carolinas, and west to Arkansas and 

 Illinois. Professor Frank Smith took examples at Macatawa, 

 Mich., where he says it is fairly common. In Illinois it hag 

 been taken only at Havana, Bloomington, and Urbana, a single 

 specimen in each case. The one taken at Havana was flying 

 along the river front. The extreme dates on record are June 

 20 and October 15, most of the occurrences being in July. 



The nymph measures 35 mm.; abdomen, 24 mm.; hind 

 femur, 6 mm.; width of abdomen, 7.5 mm., of head, 7 mm. 



Body elongate; eyes large and very prominent, the sides of 

 the head extending backward from the middle of the hind 

 border of the eyes to very prominent slightly elevated hind 

 angles, between which the hind margin is regularly concave. 



Labium extending between middle legs. Median lobe prom- 

 inent, cleft, a conspicuous tooth on each side of cleft, at some 

 distance from it, on front margin. 



Lateral lobes truncate apically, with a stout tooth at the 

 inner apical angle and the convex inner margin denticulate. 

 Hook stout, arcuate, and rather sharply incurved at tip. 



Prothorax a little narrower than hind margin of head. 

 Abdomen widest across segment 7, wing-cases reaching only the 

 middle of 4, lateral spines well marked on 5, larger and gradu- 

 ally increasing in length on succeeding segments. Inferior ab- 



